DOCSLIB.ORG

Bibliography from ADS File: Jordan-Stuart.Bib June 27, 2021 1

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text
Bibliography from ADS File: Jordan-Stuart.Bib June 27, 2021 1 Bibliography from ADS file: jordan-stuart.bib Tremblay, P. E., Gentile-Fusillo, N., Cummings, J., et al., “White dwarfs in the August 16, 2021 Gaia era”, 2018IAUS..330..317T ADS Gentile Fusillo, N. P., Tremblay, P. E., Jordan, S., et al., “Can magnetic fields suppress convection in the atmosphere of cool white dwarfs? A case study on Gentile Fusillo, N. P., Tremblay, P. E., Cukanovaite, E., et al., “A catalogue of WD2105-820”, 2018MNRAS.473.3693G ADS white dwarfs in Gaia EDR3”, 2021arXiv210607669G ADS Gaia Collaboration, Clementini, G., Eyer, L., et al., “Gaia Data Re- Gaia Collaboration, Brown, A. G. A., Vallenari, A., et al., “Gaia Early Data lease 1. Testing parallaxes with local Cepheids and RR Lyrae stars”, Release 3. Summary of the contents and survey properties (Corrigendum)”, 2017A&A...605A..79G ADS 2021A&A...650C...3G ADS Moitinho, A., Krone-Martins, A., Savietto, H., et al., “Gaia Data Release 1. The Gaia Collaboration, Klioner, S. A., Mignard, F., et al., “Gaia Early archive visualisation service”, 2017A&A...605A..52M ADS Data Release 3. Acceleration of the Solar System from Gaia astrometry”, Kepler, S. O., Pelisoli, I., Jordan, S., et al., “VizieR Online Data Catalog: SDSS 2021A&A...649A...9G ADS magnetic white dwarf stars (Kepler+, 2013)”, 2017yCat..74292934K Gaia Collaboration, Antoja, T., McMillan, P. J., et al., “Gaia Early Data Release ADS 3. The Galactic anticentre”, 2021A&A...649A...8G ADS Gaia Collaboration, van Leeuwen, F., Vallenari, A., et al., “Gaia Data Release Gaia Collaboration, Luri, X., Chemin, L., et al., “Gaia Early Data 1. Open cluster astrometry: performance, limitations, and future prospects”, Release 3. Structure and properties of the Magellanic Clouds”, 2017A&A...601A..19G ADS 2021A&A...649A...7G ADS Gaia Collaboration, van Leeuwen F., Vallenari, A., et al., “VizieR Online Data Gaia Collaboration, Smart, R. L., Sarro, L. M., et al., “Gaia Early Data Release Catalog: Gaia DR1 open cluster members (Gaia Collaboration+, 2017)”, 3. The Gaia Catalogue of Nearby Stars”, 2021A&A...649A...6G ADS 2017yCat..36010019G ADS Lindegren, L., Klioner, S. A., Hernández, J., et al., “Gaia Early Data Release 3. Tremblay, P. E., Gentile-Fusillo, N., Raddi, R., et al., “The Gaia DR1 mass- The astrometric solution”, 2021A&A...649A...2L ADS radius relation for white dwarfs”, 2017MNRAS.465.2849T ADS Gaia Collaboration, Brown, A. G. A., Vallenari, A., et al., “Gaia Hardy, F., Dufour, P., & Jordan, S., “Magnetic White Dwarfs with Heavy Ele- Early Data Release 3. Summary of the contents and survey properties”, ments”, 2017ASPC..509..205H ADS 2021A&A...649A...1G ADS Jordan, S., “White Dwarfs in Gaia Data Release 1”, 2017ASPC..509....9J Tremblay, P. E., Hollands, M. A., Gentile Fusillo, N. P., et al., “VizieR On- ADS line Data Catalog: Gaia white dwarfs within 40pc. I (Tremblay+, 2020)”, Lindegren, L., Lammers, U., Bastian, U., et al., “Gaia Data Release 1. As- 2021yCat..74970130T ADS trometry: one billion positions, two million proper motions and parallaxes”, Gaia Collaboration, Luri, X., Chemin, L., et al., “VizieR Online Data 2016A&A...595A...4L ADS Catalog: MC structure and properties (Gaia Collaboration+, 2021)”, Fabricius, C., Bastian, U., Portell, J., et al., “Gaia Data Release 1. Pre- 2020yCat..36490007G ADS processing and source list creation”, 2016A&A...595A...3F ADS Gaia Collaboration, Smart, R. L., Sarro, L. M., et al., “VizieR Online Data Cat- Gaia Collaboration, Brown, A. G. A., Vallenari, A., et al., “Gaia Data Re- alog: Gaia Catalogue of Nearby Stars - GCNS (Gaia collaboration, 2021)”, lease 1. Summary of the astrometric, photometric, and survey properties”, 2020yCat..36490006G ADS 2016A&A...595A...2G ADS Gaia Collaboration, Helmi, A., van Leeuwen, F., et al., “Gaia Data Release 2. Gaia Collaboration, Prusti, T., de Bruijne, J. H. J., et al., “The Gaia mission”, The kinematics of globular clusters and dwarf galaxies around the Milky Way 2016A&A...595A...1G ADS (Corrigendum)”, 2020A&A...642C...1G ADS Gänsicke, B., Tremblay, P., Barstow, M., et al., “Stellar Archaeology with Gaia: Tremblay, P. E., Hollands, M. A., Gentile Fusillo, N. P., et al., “Gaia white The Galactic White Dwarf Population”, 2016ASPC..507..159G ADS dwarfs within 40 pc - I. Spectroscopic observations of new candidates”, Kepler, S. O., Pelisoli, I., Koester, D., et al., “VizieR Online Data 2020MNRAS.497..130T ADS Catalog: New white dwarf stars in SDSS DR10 (Kepler+, 2015)”, 2015yCat..74464078K Gaia Collaboration, Helmi, A., van Leeuwen, F., et al., “Gaia Data Release ADS , “New White Dwarfs in the SDSS 2. Kinematics of globular clusters and dwarf galaxies around the Milky Way Kepler, S. O., Pelisoli, I., Koester, D., et al. DR10”, 2015ASPC..493..449K ADS (Corrigendum)”, 2020A&A...637C...3G ADS Dufour, P., Jordan, S., Blouin, S., et al., “Magnetic Atmosphere Models for White Gaia Collaboration, Eyer, L., Rimoldini, L., et al., “VizieR Online Data Cat- Dwarfs with Heavy Elements”, 2015ASPC..493...37D ADS alog: Gaia DR2. Variable stars in CMD (Gaia Collaboration+, 2019)”, Kepler, S. O., Pelisoli, I., Koester, D., et al., “New white dwarf stars in the Sloan 2019yCat..36230110G ADS Digital Sky Survey Data Release 10”, 2015MNRAS.446.4078K ADS Gaia Collaboration, Eyer, L., Rimoldini, L., et al., “Gaia Data Re- Barstow, M. A., Casewell, S. L., Catalan, S., et al., “White paper: Gaia and the lease 2. Variable stars in the colour-absolute magnitude diagram”, end states of stellar evolution”, 2014arXiv1407.6163B ADS 2019A&A...623A.110G ADS Jordan, S. & Loll, R., “De Sitter universe from causal dynamical triangulations Gentile Fusillo, N. P., Tremblay, P. E., Gaensicke, B. T., et al., “VizieR Online without preferred foliation”, 2013PhRvD..88d4055J ADS Data Catalog: Gaia DR2 white dwarf candidates (Gentile Fusillo+, 2019)”, Jordan, S. & Loll, R., “Causal Dynamical Triangulations without preferred fo- 2019yCat..74824570G ADS liation”, 2013PhLB..724..155J ADS Tremblay, P. E., Gentile-Fusillo, N., Raddi, R., et al., “VizieR Online Data Cat- Külebi, B., Kalirai, J., Jordan, S., & Euchner, F., “The progenitors of magnetic alog: Gaia DR1 mass-radius relation of white dwarfs (Tremblay+ 2017)”, white dwarfs in open clusters”, 2013A&A...554A..18K ADS 2018yCat..74652849T ADS Kepler, S. O., Pelisoli, I., Jordan, S., et al., “Magnetic white dwarf stars in the Gaia Collaboration, Mignard, F., Klioner, S. A., et al., “Gaia Data Release Sloan Digital Sky Survey”, 2013MNRAS.429.2934K ADS 2. The celestial reference frame (Gaia-CRF2)”, 2018A&A...616A..14G Ambjørn, J., Jordan, S., Jurkiewicz, J., & Loll, R., “Quantum spacetime, from a ADS practitioner’s point of view”, 2013AIPC.1514...60A ADS Gaia Collaboration, Spoto, F., Tanga, P., et al., “Gaia Data Release 2. Observa- Dobbie, P. D., Külebi, B., Casewell, S. L., et al., “High-field magnetic white tions of solar system objects”, 2018A&A...616A..13G ADS dwarfs as the progeny of early-type stars?”, 2013MNRAS.428L..16D ADS Gaia Collaboration, Helmi, A., van Leeuwen, F., et al., “Gaia Data Release 2. Jordan, S., Bagnulo, S., Landstreet, J., et al., “Low Magnetic Fields in White Kinematics of globular clusters and dwarf galaxies around the Milky Way”, Dwarfs and their Direct Progenitors?”, 2013ASPC..469..411J ADS 2018A&A...616A..12G ADS Jordan, S. & de Bruijne, J., “Astrometric Determination of White Dwarf Radial Gaia Collaboration, Katz, D., Antoja, T., et al., “Gaia Data Release 2. Mapping Velocities with Gaia?”, 2013ASPC..469..257J ADS the Milky Way disc kinematics”, 2018A&A...616A..11G ADS Tremblay, P. E., Schilbach, E., Röser, S., et al., “White Dwarfs Escaping From Gaia Collaboration, Babusiaux, C., van Leeuwen, F., et al., “Gaia Data Release the Hyades”, 2013ASPC..469..105T ADS 2. Observational Hertzsprung-Russell diagrams”, 2018A&A...616A..10G Stevens, L., Carson, J., Ruwadi, D., et al., “The Hubble Exoplanet Classroom”, ADS 2013AAS...22124605S ADS Lindegren, L., Hernández, J., Bombrun, A., et al., “Gaia Data Release 2. The Tremblay, P. E., Schilbach, E., Röser, S., et al., “Spectroscopic and photometric astrometric solution”, 2018A&A...616A...2L ADS studies of white dwarfs in the Hyades”, 2012A&A...547A..99T ADS Gaia Collaboration, Brown, A. G. A., Vallenari, A., et al., “Gaia Data Release 2. Landstreet, J. D., Bagnulo, S., Valyavin, G. G., et al., “On the incidence of weak Summary of the contents and survey properties”, 2018A&A...616A...1G magnetic fields in DA white dwarfs”, 2012A&A...545A..30L ADS ADS Ambjørn, J., Jordan, S., Jurkiewicz, J., & Loll, R., “Second- and Gaia Collaboration, Babusiaux, C., van Leeuwen, F., et al., “VizieR Online first-order phase transitions in causal dynamical triangulations”, Data Catalog: 46 open clusters GaiaDR2 HR diagrams (Gaia Collaboration, 2012PhRvD..85l4044A ADS 2018)”, 2018yCat..36160010G ADS Jordan, S., Bagnulo, S., Werner, K., & O’Toole, S. J., “Magnetic fields in central Gaia Collaboration, Helmi, A., van Leeuwen, F., et al., “VizieR Online Data stars of planetary nebulae?”, 2012A&A...542A..64J ADS Catalog: Gaia DR2 sources in GC and dSph (Gaia Collaboration+, 2018)”, Landstreet, J. D., Bagnulo, S., Fossati, L., Jordan, S., & O’Toole, S. J., “The 2018yCat..36160012G ADS magnetic fields of hot subdwarf stars”, 2012A&A...541A.100L ADS 1 Gilmore, G., Randich, S., Asplund, M., et al., “The Gaia-ESO Public Spectro- Jordan, S., Werner, K., & O’Toole, S. J., “Discovery of magnetic fields in central scopic Survey”, 2012Msngr.147...25G ADS stars of planetary nebulae”, 2005A&A...432..273J ADS Dobbie, P. D., Baxter, R., Külebi, B., et al., “Two new young, wide, magnetic + Jordan, S., Bastian, U., Lenhardt, H., et al., “Gaia First Look”, non-magnetic double-degenerate binary systems”, 2012MNRAS.421..202D 2005ESASP.576..405J ADS ADS Reinsch, K., Euchner, F., Beuermann, K., & Jordan, S., “Magnetic Field Topol- Ambjørn, J., Jordan, S., Jurkiewicz, J., & Loll, R., “Second-Order Phase Transi- ogy of Accreting White Dwarfs”, 2004ASPC..315...71R ADS tion in Causal Dynamical Triangulations”, 2011PhRvL.107u1303A ADS Gänsicke, B.
Load more

Recommended publications
  • 136, June 2008
    British Astronomical Association VARIABLE STAR SECTION CIRCULAR No 136, June 2008 Contents Group Photograph, AAVSO/BAAVSS meeting ........................ inside front cover From the Director ............................................................................................... 1 Eclipsing Binary News ....................................................................................... 4 Experiments in the use of a DSLR camera for V photometry ............................ 5 Joint Meeting of the AAVSO and the BAAVSS ................................................. 8 Coordinated HST and Ground Campaigns on CVs ............................... 8 Eclipsing Binaries - Observational Challenges .................................................. 9 Peer to Peer Astronomy Education .................................................................. 10 AAVSO Acronyms De-mystified in Fifteen Minutes ...................................... 11 New Results on SW Sextantis Stars and Proposed Observing Campaign ........ 12 A Week in the Life of a Remote Observer ........................................................ 13 Finding Eclipsing Binaries in NSVS Data ......................................................... 13 British Variable Star Associations 1848-1908 .................................................. 14 “Chasing Rainbows” (The European Amateur Spectroscopy Scene) .............. 15 Long Term Monitoring and the Carbon Miras ................................................. 18 Cataclysmic Variables from Large Surveys: A Silent Revolution
    [Show full text]
  • Fy10 Budget by Program
    AURA/NOAO FISCAL YEAR ANNUAL REPORT FY 2010 Revised Submitted to the National Science Foundation March 16, 2011 This image, aimed toward the southern celestial pole atop the CTIO Blanco 4-m telescope, shows the Large and Small Magellanic Clouds, the Milky Way (Carinae Region) and the Coal Sack (dark area, close to the Southern Crux). The 33 “written” on the Schmidt Telescope dome using a green laser pointer during the two-minute exposure commemorates the rescue effort of 33 miners trapped for 69 days almost 700 m underground in the San Jose mine in northern Chile. The image was taken while the rescue was in progress on 13 October 2010, at 3:30 am Chilean Daylight Saving time. Image Credit: Arturo Gomez/CTIO/NOAO/AURA/NSF National Optical Astronomy Observatory Fiscal Year Annual Report for FY 2010 Revised (October 1, 2009 – September 30, 2010) Submitted to the National Science Foundation Pursuant to Cooperative Support Agreement No. AST-0950945 March 16, 2011 Table of Contents MISSION SYNOPSIS ............................................................................................................ IV 1 EXECUTIVE SUMMARY ................................................................................................ 1 2 NOAO ACCOMPLISHMENTS ....................................................................................... 2 2.1 Achievements ..................................................................................................... 2 2.2 Status of Vision and Goals ................................................................................
    [Show full text]
  • Arxiv:2001.10147V1
    Magnetic fields in isolated and interacting white dwarfs Lilia Ferrario1 and Dayal Wickramasinghe2 Mathematical Sciences Institute, The Australian National University, Canberra, ACT 2601, Australia Adela Kawka3 International Centre for Radio Astronomy Research, Curtin University, Perth, WA 6102, Australia Abstract The magnetic white dwarfs (MWDs) are found either isolated or in inter- acting binaries. The isolated MWDs divide into two groups: a high field group (105 − 109 G) comprising some 13 ± 4% of all white dwarfs (WDs), and a low field group (B < 105 G) whose incidence is currently under investigation. The situation may be similar in magnetic binaries because the bright accretion discs in low field systems hide the photosphere of their WDs thus preventing the study of their magnetic fields’ strength and structure. Considerable research has been devoted to the vexed question on the origin of magnetic fields. One hypothesis is that WD magnetic fields are of fossil origin, that is, their progenitors are the magnetic main-sequence Ap/Bp stars and magnetic flux is conserved during their evolution. The other hypothesis is that magnetic fields arise from binary interaction, through differential rotation, during common envelope evolution. If the two stars merge the end product is a single high-field MWD. If close binaries survive and the primary develops a strong field, they may later evolve into the arXiv:2001.10147v1 [astro-ph.SR] 28 Jan 2020 magnetic cataclysmic variables (MCVs). The recently discovered population of hot, carbon-rich WDs exhibiting an incidence of magnetism of up to about 70% and a variability from a few minutes to a couple of days may support the [email protected] [email protected] [email protected] Preprint submitted to Journal of LATEX Templates January 29, 2020 merging binary hypothesis.
    [Show full text]
  • Jahresbericht 2010 Mitteilungen Der Astronomischen Gesellschaft 94 (2013), 583–627
    Jahresbericht 2010 Mitteilungen der Astronomischen Gesellschaft 94 (2013), 583–627 Potsdam Leibniz-Institut für Astrophysik Potsdam (AIP) An der Sternwarte 16, D-14482 Potsdam Tel. 03317499-0, Telefax: 03317499-267 E-Mail: [email protected] WWW: http://www.aip.de Beobachtungseinrichtungen Robotisches Observatorium STELLA Observatorio del Teide, Izaña E-38205 La Laguna, Teneriffa, Spanien Tel. +34 922 329 138 bzw. 03317499-633 LOFAR-Station DE604 Potsdam-Bornim D-14469 Potsdam Tel. 03317499-291, Telefax: 03317499-352 Observatorium für Solare Radioastronomie Tremsdorf D-14552 Tremsdorf Tel. 03317499-291, Telefax: 03317499-352 Sonnenobservatorium Einsteinturm Telegrafenberg, D-14473 Potsdam Tel. 0331288-2303/-2304, Telefax: 03317499-524 0 Allgemeines Das Leibniz-Institut für Astrophysik Potsdam (AIP) ist eine Stiftung bürgerlichen Rechts zum Zweck der wissenschaftlichen Forschung auf dem Gebiet der Astrophysik. Als außer- universitäre Forschungseinrichtung ist es Mitglied der Leibniz-Gemeinschaft. Seinen For- schungsauftrag führt das AIP im Rahmen von nationalen und internationalen Kooperatio- nen aus. Die Beteiligung am Large Binocular Telescope auf dem Mt Graham in Arizona, dem größten optischen Teleskop der Welt, verdient hierbei besondere Erwähnung. Neben seinen Forschungsarbeiten profiliert sich das Institut zunehmend als Kompetenzzentrum im Bereich der Entwicklung von Forschungstechnologie. Vier gemeinsame Berufungen mit der Universität Potsdam und mehrere außerplanmäßige Professuren und Privatdozenturen an Universitäten in der Region und
    [Show full text]
  • X-Shooting EF Eridani: Further Evidence for a Massive White Dwarf and a Sub-Stellar Secondary ⋆
    Astronomy & Astrophysics manuscript no. eferi˙xshooter c ESO 2010 March 8, 2010 X-Shooting EF Eridani: further evidence for a massive white dwarf and a sub-stellar secondary ⋆ A.D. Schwope1 and L. Christensen2,3 1 Astrophysikalisches Institut Potsdam, An der Sternwarte 16, 14482 Potsdam, Germany e-mail: [email protected] 2 European Southern Observatory, Casilla 19001, Santiago 19, Chile 3 Excellence Cluster Universe, Technische Universit¨at M¨unchen, Boltzmanstrasse 2, 85748 Garching, Germany Received ; accepted ABSTRACT High resolution spectral observations of the polar EF Eridani obtained in a low state with X-Shooter revealed narrow emission lines from the irradiated secondary. The lines were most prominent in the near-IR Ca-triplet, the more intensive Hα line had additional emission likely ′ −1 originating from an accretion stream. The lines with a radial velocity amplitude, K2 = 385 ± 4 km s , serve as tracer of the otherwise unseen companion. The mass function implies a massive white dwarf with Mwd> 0.65 M⊙ at 3σ confidence, and a short distance to the binary, d ∼ 111 pc (< 145 pc at 3σ confidence). The spectral energy distribution from the UV to the IR together with the high mass ratio gives further strong evidence of EF Eri being a post period-minimum object with M2 < 0.06 M⊙. Key words. stars: individual: EF Eri– stars: cataclysmic variables 1. Introduction several line components could be uniquely associated with a physical structure in the binary apart from the high-velocity EF Eridani was only the third Polar (AM Herculis binary) dis- line wings which clearly originate in streaming matter between covered after AM Herculis itself and VV Puppis and the first the two stars.
    [Show full text]
  • Nebular Metallicities in Isolated Dwarf Irregular Galaxies
    Nebular Metallicities in Isolated Dwarf Irregular Galaxies David Conway Nicholls A thesis submitted for the degree of Doctor of Philosophy of the Australian National University Research School of Astronomy & Astrophysics July 2014 Notes on the Digital Copy This document makes extensive use of the hyperlinking features of LATEX. References to figures, tables, sections, chapters and the literature can be navigated from within the PDF by clicking on the reference. Internet addresses will be displayed in a browser. Most object names are resolvable in the SIMBAD (http://simbad.u-strasbg.fr/simbad/) astronomical database. The bibliography at the end of this thesis has been hyperlinked to the NASA Astrophysics Data Service (http://www.adsabs.harvard.edu/). Further information on each of the cited works is available through the link to ADS. For Linda. i Disclaimer I hereby declare that the work in this thesis is that of the candidate alone, except where indicated below or in the text of the thesis. The work was undertaken between January 2009 and February 2014 at the Australian National University, Canberra. It has not been submitted in whole or in part for any other degree at this or any other university. Chapter 2 is the paper The Small Isolated Gas-rich Irregular Dwarf (SIGRID) Galaxy Sample: Description and First Results published in the Astronomical Journal, September 2011, volume 142, pp.83 et seq., by David C Nicholls, Michael A Dopita, Helmut Jerjen and Gerhardt R Meurer. The work is entirely that of the candidate. Chapter 3 is the paper Resolving the Electron Temperature Discrepancies in H II Regions and Planetary Nebulae: κ-distributed Electrons published in the Astrophysical Journal, June 2012, volume 752, pp.148 et seq., by David C Nicholls, Michael A Dopita, and Ralph S Sutherland.
    [Show full text]
  • Noao Annual Report Fy07
    AURA/NOAO ANNUAL REPORT FY 2007 Submitted to the National Science Foundation September 30, 2007 Revised as Final and Submitted January 30, 2008 Emission nebula NGC6334 (Cat’s Paw Nebula): star-forming region in the constellation Scorpius. This 2007 image was taken using the Mosaic-2 imager on the Blanco 4-meter telescope at Cerro Tololo Inter- American Observatory. Intervening dust in the plane of the Milky Way galaxy reddens the colors of the nebula. Image credit: T.A. Rector/University of Alaska Anchorage, T. Abbott and NOAO/AURA/NSF NATIONAL OPTICAL ASTRONOMY OBSERVATORY NOAO ANNUAL REPORT FY 2007 Submitted to the National Science Foundation September 30, 2007 Revised as Final and Submitted January 30, 2008 TABLE OF CONTENTS EXECUTIVE SUMMARY ............................................................................................................................. 1 1 SCIENTIFIC ACTIVITIES AND FINDINGS ..................................................................................... 2 1.1 NOAO Gemini Science Center .............................................................................. 2 GNIRS Infrared Spectroscopy and the Origins of the Peculiar Hydrogen-Deficient Stars...................... 2 Supermassive Black Hole Growth and Chemical Enrichment in the Early Universe.............................. 4 1.2 Cerro Tololo Inter-American Observatory (CTIO)................................................ 5 The Nearest Stars.......................................................................................................................................
    [Show full text]
  • Telescope Clarity Phase
    Durham E-Theses Atmospheric Cerenkov astronomy of cataclysmic variables & other potential gamma ray sources Bradbury, Stella Marie How to cite: Bradbury, Stella Marie (1993) Atmospheric Cerenkov astronomy of cataclysmic variables & other potential gamma ray sources, Durham theses, Durham University. Available at Durham E-Theses Online: http://etheses.dur.ac.uk/5632/ Use policy The full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-prot purposes provided that: • a full bibliographic reference is made to the original source • a link is made to the metadata record in Durham E-Theses • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders. Please consult the full Durham E-Theses policy for further details. Academic Support Oce, Durham University, University Oce, Old Elvet, Durham DH1 3HP e-mail: [email protected] Tel: +44 0191 334 6107 http://etheses.dur.ac.uk 2 Atmospheric Cerenkov Astronomy of Cataclysmic Variables & Other Potential Gamma Ray Sources by Stella Marie Bradbury, B.Sc. The copyright of this thesis rests with the author. No quotation from it should be pubhshed without his prior written consent and information derived from it should be acknowledged. A thesis submitted to the University of Durham in accordance with the regulations for admittance to the degree of Doctor of Philosophy Department of Physics November 1993 University of Durham 2 2 FEB m ABSTRACT Recent developments in the application of the atmospheric Cerenkov technique to 7-ray astronomy are reviewed here.
    [Show full text]
  • Infrared Observations of Cataclysmic Variables with the Spitzer Space Telescope
    What’s Cool About Hot Stars? Infrared Observations of Cataclysmic Variables with the Spitzer Space Telescope D. W. Hoard, S. Wachter, C. S. Brinkworth, S. Kafka Spitzer Science Center, California Institute of Technology, Pasadena, CA 91125 S. B. Howell NOAO/WIYN Observatory, Tucson, AZ 85719 D. R. Ciardi Michelson Science Center, California Institute of Technology, Pasadena, CA 91125 Abstract. Cataclysmic variables have been extensively observed at optical, ultraviolet, and X- ray wavelengths, where their white dwarf primary stars and bright accretion disks dominate their emitted luminosity. Comparatively little is known about the infrared properties of cataclysmic vari- ables. The assumption that infrared observations would reveal only the “uninteresting” secondary star has been shown to be false: recent infrared observations of cataclysmic variables have instead shown that cool dust in these interacting binaries is possibly the most important contributor to their spectral energy distributions at long wavelengths. We present recent results from infrared observations of the cataclysmic variable EF Eridani obtained with the Spitzer Space Telescope. 1. Dust in EF Eridani EF Eri is a short orbital period (Porb = 81 min) cataclysmic variable containing a strongly magnetic white dwarf (B = 13–14 MG). It lacks an accretion disk because of the white dwarf magnetic field, and accretion proceeds directly from the inner Lagrangian point onto the white dwarf field lines. Cataclysmic variables with this orbital period contain a very low mass, degenerate brown dwarf-like secondary star, whose mass has been whittled down during the secular evolution of the cataclysmic variable until it can no longer support fusion. The secondary star mass in EF Eri is estimated to be 0.04–0.06 M (Howell et al.
    [Show full text]
  • X-Shooting EF Eridani: Further Evidence for a Massive White Dwarf and a Sub-Stellar Secondary
    A&A 514, A89 (2010) Astronomy DOI: 10.1051/0004-6361/200913341 & c ESO 2010 Astrophysics X-Shooting EF Eridani: further evidence for a massive white dwarf and a sub-stellar secondary A. D. Schwope1 and L. Christensen2,3 1 Astrophysikalisches Institut Potsdam, An der Sternwarte 16, 14482 Potsdam, Germany e-mail: [email protected] 2 European Southern Observatory, Casilla 19001, Santiago 19, Chile 3 Excellence Cluster Universe, Technische Universität München, Boltzmannstrasse 2, 85748 Garching, Germany Received 23 September 2009 / Accepted 3 March 2010 ABSTRACT High resolution spectral observations of the polar EF Eridani obtained in a low state with X-Shooter revealed narrow emission lines from the irradiated secondary. The lines were most prominent in the near-IR Caii-triplet, the more intensive Hα line had additional = ± −1 emission likely originating from an accretion stream. The lines with a radial velocity amplitude, K2 385 4kms , serve as tracer of the otherwise unseen companion. The mass function implies a massive white dwarf with Mwd > 0.65 M at 3σ confidence, and a short distance to the binary, d ∼ 111 pc (<145 pc at 3σ confidence). The spectral energy distribution from the UV to the IR together with the high mass ratio gives further strong evidence of EF Eri being a post period-minimum object with M2 < 0.06 M. Key words. stars: individual: EF Eridani – novae, cataclysmic variables 1. Introduction Zeeman tomography based on low-resolution VLT/FORS spec- tra (Beuermann et al. 2007). Evidence for a high-mass white EF Eridani was only the third polar system (AM Herculis cata- dwarf, Mwd = 0.82−1.00 M was derived by fitting the GINGA clysmic variable binary) discovered after AM Herculis itself and X-ray spectrum (Cropper et al.
    [Show full text]
  • Annual Report 2007 ESO
    ESO European Organisation for Astronomical Research in the Southern Hemisphere Annual Report 2007 ESO European Organisation for Astronomical Research in the Southern Hemisphere Annual Report 2007 presented to the Council by the Director General Prof. Tim de Zeeuw ESO is the pre-eminent intergovernmental science and technology organisation in the field of ground-based astronomy. It is supported by 13 countries: Belgium, the Czech Republic, Denmark, France, Finland, Germany, Italy, the Netherlands, Portugal, Spain, Sweden, Switzerland and the United Kingdom. Further coun- tries have expressed interest in member- ship. Created in 1962, ESO provides state-of- the-art research facilities to European as- tronomers. In pursuit of this task, ESO’s activities cover a wide spectrum including the design and construction of world- class ground-based observational facili- ties for the member-state scientists, large telescope projects, design of inno- vative scientific instruments, developing new and advanced technologies, further- La Silla. ing European cooperation and carrying out European educational programmes. One of the most exciting features of the In 2007, about 1900 proposals were VLT is the possibility to use it as a giant made for the use of ESO telescopes and ESO operates the La Silla Paranal Ob- optical interferometer (VLT Interferometer more than 700 peer-reviewed papers servatory at several sites in the Atacama or VLTI). This is done by combining the based on data from ESO telescopes were Desert region of Chile. The first site is light from several of the telescopes, al- published. La Silla, a 2 400 m high mountain 600 km lowing astronomers to observe up to north of Santiago de Chile.
    [Show full text]
  • Extreme Ultraviolet Spectroscopy of Magnetic Cataclysmic Variables FRITS PAERELS,1 MIN YOUNG HUR,1 and CHRISTOPHER W
    Extreme Ultraviolet Spectroscopy of Magnetic Cataclysmic Variables FRITS PAERELS,1 MIN YOUNG HUR,1 AND CHRISTOPHER W. MAUCHE2 1 Space Sciences Laboratory and Department of Physics, University of California, Berkeley, CA 94720-7300 2Lawrence Livermore National Laboratory, L-41, P.O. Box 808, Livermore, CA 94550. A longstanding problem in the interpretation of the X-ray and extreme ultraviolet emission from strongly magnetic cataclysmic variables can be addressed definitively with high resolution EUV spectroscopy. A detailed photospheric spectrum of the accretion-heated polar cap of the white dwarf is sensitive in principle to the temperature structure of the atmosphere. This may allow us to determine where and how the bulk of the accretion energy is thermalized. The EUVE data, on AM Herculis and EF Eridani are presented and discussed in this context. 1. Introduction When matter accretes onto a white dwarf star with a strong (B > 107 G) magnetic field, the accretion flow near the white dwarf will be dominated by the field geometry, and quasi-lD "column" accretion onto a small polar cap ensues. Such is the case in the "polar" (after the strong polarization of their optical emission), or AM Herculis subclass of cataclysmic variables (CVs). In these objects, the field is known to be strong enough to actually dominate the accretion flow all across the binary, and an accretion disk does not form (see Cropper 1990 for a general review). Spin-orbit synchronization seems to have taken place in all but a few of the members of the class. Since particles falling freely onto a white dwarf do not acquire enough kinetic en­ ergy to penetrate the stellar atmosphere, the bulk of the available kinetic energy must be thermalized and radiated above the atmosphere under optically thin conditions (see Frank, King, & Raine 1990 for a general treatment of accretion physics).
    [Show full text]