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Hubbl E Space T El Escope Wfpc2 Imaging of Fs Tauri and Haro 6-5B1 John E.Krist,2 Karl R.Stapelfeldt,3 Christopher J.Burrows,2,4 Gilda E.Ballester,5 John T
THE ASTROPHYSICAL JOURNAL, 501:841È852, 1998 July 10 ( 1998. The American Astronomical Society. All rights reserved. Printed in U.S.A. HUBBL E SPACE T EL ESCOPE WFPC2 IMAGING OF FS TAURI AND HARO 6-5B1 JOHN E.KRIST,2 KARL R.STAPELFELDT,3 CHRISTOPHER J.BURROWS,2,4 GILDA E.BALLESTER,5 JOHN T. CLARKE,5 DAVID CRISP,3 ROBIN W.EVANS,3 JOHN S.GALLAGHER III,6 RICHARD E.GRIFFITHS,7 J. JEFF HESTER,8 JOHN G.HOESSEL,6 JON A.HOLTZMAN,9 JEREMY R.MOULD,10 PAUL A. SCOWEN,8 JOHN T.TRAUGER,3 ALAN M. WATSON,11 AND JAMES A. WESTPHAL12 Received 1997 December 18; accepted 1998 February 16 ABSTRACT We have observed the Ðeld of FS Tauri (Haro 6-5) with the Wide Field Planetary Camera 2 on the Hubble Space Telescope. Centered on Haro 6-5B and adjacent to the nebulous binary system of FS Tauri A there is an extended complex of reÑection nebulosity that includes a di†use, hourglass-shaped structure. H6-5B, the source of a bipolar jet, is not directly visible but appears to illuminate a compact, bipolar nebula which we assume to be a protostellar disk similar to HH 30. The bipolar jet appears twisted, which explains the unusually broad width measured in ground-based images. We present the Ðrst resolved photometry of the FS Tau A components at visual wavelengths. The Ñuxes of the fainter, eastern component are well matched by a 3360 K blackbody with an extinction ofAV \ 8. For the western star, however, any reasonable, reddened blackbody energy distribution underestimates the K-band photometry by over 2 mag. -
A Gaia DR2 View of the Open Cluster Population in the Milky Way T
Astronomy & Astrophysics manuscript no. manuscript˙arXiv2 © ESO 2018 July 13, 2018 A Gaia DR2 view of the Open Cluster population in the Milky Way T. Cantat-Gaudin1, C. Jordi1, A. Vallenari2, A. Bragaglia3, L. Balaguer-Nu´nez˜ 1, C. Soubiran4, D. Bossini2, A. Moitinho5, A. Castro-Ginard1, A. Krone-Martins5, L. Casamiquela4, R. Sordo2, and R. Carrera2 1 Institut de Ciencies` del Cosmos, Universitat de Barcelona (IEEC-UB), Mart´ı i Franques` 1, E-08028 Barcelona, Spain 2 INAF-Osservatorio Astronomico di Padova, vicolo Osservatorio 5, 35122 Padova, Italy 3 INAF-Osservatorio di Astrofisica e Scienza dello Spazio, via Gobetti 93/3, 40129 Bologna, Italy 4 Laboratoire dAstrophysique de Bordeaux, Univ. Bordeaux, CNRS, UMR 5804, 33615 Pessac, France 5 CENTRA, Faculdade de Ciencias,ˆ Universidade de Lisboa, Ed. C8, Campo Grande, P-1749-016 Lisboa, Portugal Received date / Accepted date ABSTRACT Context. Open clusters are convenient probes of the structure and history of the Galactic disk. They are also fundamental to stellar evolution studies. The second Gaia data release contains precise astrometry at the sub-milliarcsecond level and homogeneous pho- tometry at the mmag level, that can be used to characterise a large number of clusters over the entire sky. Aims. In this study we aim to establish a list of members and derive mean parameters, in particular distances, for as many clusters as possible, making use of Gaia data alone. Methods. We compile a list of thousands of known or putative clusters from the literature. We then apply an unsupervised membership assignment code, UPMASK, to the Gaia DR2 data contained within the fields of those clusters. -
The Birth of Stars and Planets
Unit 6: The Birth of Stars and Planets This material was developed by the Friends of the Dominion Astrophysical Observatory with the assistance of a Natural Science and Engineering Research Council PromoScience grant and the NRC. It is a part of a larger project to present grade-appropriate material that matches 2020 curriculum requirements to help students understand planets, with a focus on exoplanets. This material is aimed at BC Grade 6 students. French versions are available. Instructions for teachers ● For questions and to give feedback contact: Calvin Schmidt [email protected], ● All units build towards the Big Idea in the curriculum showing our solar system in the context of the Milky Way and the Universe, and provide background for understanding exoplanets. ● Look for Ideas for extending this section, Resources, and Review and discussion questions at the end of each topic in this Unit. These should give more background on each subject and spark further classroom ideas. We would be happy to help you expand on each topic and develop your own ideas for your students. Contact us at the [email protected]. Instructions for students ● If there are parts of this unit that you find confusing, please contact us at [email protected] for help. ● We recommend you do a few sections at a time. We have provided links to learn more about each topic. ● You don’t have to do the sections in order, but we recommend that. Do sections you find interesting first and come back and do more at another time. ● It is helpful to try the activities rather than just read them. -
A Basic Requirement for Studying the Heavens Is Determining Where In
Abasic requirement for studying the heavens is determining where in the sky things are. To specify sky positions, astronomers have developed several coordinate systems. Each uses a coordinate grid projected on to the celestial sphere, in analogy to the geographic coordinate system used on the surface of the Earth. The coordinate systems differ only in their choice of the fundamental plane, which divides the sky into two equal hemispheres along a great circle (the fundamental plane of the geographic system is the Earth's equator) . Each coordinate system is named for its choice of fundamental plane. The equatorial coordinate system is probably the most widely used celestial coordinate system. It is also the one most closely related to the geographic coordinate system, because they use the same fun damental plane and the same poles. The projection of the Earth's equator onto the celestial sphere is called the celestial equator. Similarly, projecting the geographic poles on to the celest ial sphere defines the north and south celestial poles. However, there is an important difference between the equatorial and geographic coordinate systems: the geographic system is fixed to the Earth; it rotates as the Earth does . The equatorial system is fixed to the stars, so it appears to rotate across the sky with the stars, but of course it's really the Earth rotating under the fixed sky. The latitudinal (latitude-like) angle of the equatorial system is called declination (Dec for short) . It measures the angle of an object above or below the celestial equator. The longitud inal angle is called the right ascension (RA for short). -
WIS-2015-07-Radioastronomie ALMA Teil4.Pdf (Application/Pdf 4.0
Das Projekt ALMA Mater* Teil 4: Eine Beobachtung, die es in sich hat: eine „Kinderstube“ für Planeten *Wir verwenden die Bezeichnung Alma Mater als Synonym für eine Universität. Seinen Ursprung hat das Doppelwort im Lateinischen (alma: nähren, mater: Mutter). Im übertragenen Sinne ernährt die (mütterliche) Universität ihre Studenten mit Wissen. Und weiter gesponnen ernährt das Projekt ALMA auch die Schüler und Studenten mit Anreizen für das Lernen. (Zudem bedeutet das spanische Wort ‚Alma‘: Seele.) In Bezug (Materie bei T-Tauri-Sternen) zum Beitrag „Der Staubring von GG Tauri“ von Wolfgang Brandner in der Zeitschrift „Sterne und Weltraum“ (SuW) 7/2015, S.30/31, WIS-ID: 1285836 Olaf Fischer Im folgenden WIS-Beitrag steht ein atemberaubendes Beobachtungsergebnis von ALMA im Brennpunkt – die detaillierte Abbildung einer protoplanetaren Scheibe um einen entstehenden Stern – die potentielle Geburtsstätte für Planeten. Neben Beschreibungen und Erklärungen werden vor allem verschiedenartige Aktivitäten (Rechnungen zur Ma und Ph, Arbeit mit Karten, Bildauswertung, Diagramminterpretation, Papiermodell, Quartett) für Schüler angeboten, um diese Beobachtung und damit im Zusammenhang stehende Inhalte (insbesondere die Sternentstehung) besser zu verstehen, auch indem diese den Nutzen des Schulwissen entdecken. Der Wert von Kenntnissen auf verschiedenen Gebieten (Sprache, Mathematik, Naturwis- senschaft, Technik) wird spürbar. Der Beitrag eignet sich als Grundlage für Schülervorträge, die Arbeit in einer AG, wie auch für den Fachunterricht in der Oberstufe. -
407 a Abell Galaxy Cluster S 373 (AGC S 373) , 351–353 Achromat
Index A Barnard 72 , 210–211 Abell Galaxy Cluster S 373 (AGC S 373) , Barnard, E.E. , 5, 389 351–353 Barnard’s loop , 5–8 Achromat , 365 Barred-ring spiral galaxy , 235 Adaptive optics (AO) , 377, 378 Barred spiral galaxy , 146, 263, 295, 345, 354 AGC S 373. See Abell Galaxy Cluster Bean Nebulae , 303–305 S 373 (AGC S 373) Bernes 145 , 132, 138, 139 Alnitak , 11 Bernes 157 , 224–226 Alpha Centauri , 129, 151 Beta Centauri , 134, 156 Angular diameter , 364 Beta Chamaeleontis , 269, 275 Antares , 129, 169, 195, 230 Beta Crucis , 137 Anteater Nebula , 184, 222–226 Beta Orionis , 18 Antennae galaxies , 114–115 Bias frames , 393, 398 Antlia , 104, 108, 116 Binning , 391, 392, 398, 404 Apochromat , 365 Black Arrow Cluster , 73, 93, 94 Apus , 240, 248 Blue Straggler Cluster , 169, 170 Aquarius , 339, 342 Bok, B. , 151 Ara , 163, 169, 181, 230 Bok Globules , 98, 216, 269 Arcminutes (arcmins) , 288, 383, 384 Box Nebula , 132, 147, 149 Arcseconds (arcsecs) , 364, 370, 371, 397 Bug Nebula , 184, 190, 192 Arditti, D. , 382 Butterfl y Cluster , 184, 204–205 Arp 245 , 105–106 Bypass (VSNR) , 34, 38, 42–44 AstroArt , 396, 406 Autoguider , 370, 371, 376, 377, 388, 389, 396 Autoguiding , 370, 376–378, 380, 388, 389 C Caldwell Catalogue , 241 Calibration frames , 392–394, 396, B 398–399 B 257 , 198 Camera cool down , 386–387 Barnard 33 , 11–14 Campbell, C.T. , 151 Barnard 47 , 195–197 Canes Venatici , 357 Barnard 51 , 195–197 Canis Major , 4, 17, 21 S. Chadwick and I. Cooper, Imaging the Southern Sky: An Amateur Astronomer’s Guide, 407 Patrick Moore’s Practical -
Astronomy Magazine 2011 Index Subject Index
Astronomy Magazine 2011 Index Subject Index A AAVSO (American Association of Variable Star Observers), 6:18, 44–47, 7:58, 10:11 Abell 35 (Sharpless 2-313) (planetary nebula), 10:70 Abell 85 (supernova remnant), 8:70 Abell 1656 (Coma galaxy cluster), 11:56 Abell 1689 (galaxy cluster), 3:23 Abell 2218 (galaxy cluster), 11:68 Abell 2744 (Pandora's Cluster) (galaxy cluster), 10:20 Abell catalog planetary nebulae, 6:50–53 Acheron Fossae (feature on Mars), 11:36 Adirondack Astronomy Retreat, 5:16 Adobe Photoshop software, 6:64 AKATSUKI orbiter, 4:19 AL (Astronomical League), 7:17, 8:50–51 albedo, 8:12 Alexhelios (moon of 216 Kleopatra), 6:18 Altair (star), 9:15 amateur astronomy change in construction of portable telescopes, 1:70–73 discovery of asteroids, 12:56–60 ten tips for, 1:68–69 American Association of Variable Star Observers (AAVSO), 6:18, 44–47, 7:58, 10:11 American Astronomical Society decadal survey recommendations, 7:16 Lancelot M. Berkeley-New York Community Trust Prize for Meritorious Work in Astronomy, 3:19 Andromeda Galaxy (M31) image of, 11:26 stellar disks, 6:19 Antarctica, astronomical research in, 10:44–48 Antennae galaxies (NGC 4038 and NGC 4039), 11:32, 56 antimatter, 8:24–29 Antu Telescope, 11:37 APM 08279+5255 (quasar), 11:18 arcminutes, 10:51 arcseconds, 10:51 Arp 147 (galaxy pair), 6:19 Arp 188 (Tadpole Galaxy), 11:30 Arp 273 (galaxy pair), 11:65 Arp 299 (NGC 3690) (galaxy pair), 10:55–57 ARTEMIS spacecraft, 11:17 asteroid belt, origin of, 8:55 asteroids See also names of specific asteroids amateur discovery of, 12:62–63 -
NGC 6334 and NGC 6357: Hα Kinematics and the Nature of the H II Regions
A&A 587, A135 (2016) Astronomy DOI: 10.1051/0004-6361/201424484 & c ESO 2016 Astrophysics NGC 6334 and NGC 6357: Hα kinematics and the nature of the H II regions D. Russeil1,J.Tigé1,C.Adami1, L. D. Anderson2,3,N.Schneider4,5,A.Zavagno1,M.R.Samal1,P.Amram1, L. Guennou6,1,E.LeCoarer7, A. Walsh8, S. N. Longmore9, and C. Purcell10 1 Aix Marseille Université, CNRS, LAM (Laboratoire d’Astrophysique de Marseille), UMR 7326, 13388 Marseille, France e-mail: [email protected] 2 Department of Physics and Astronomy, West Virginia University, Morgantown, West Virginia, WV 26506, USA 3 Adjunct Astronomer at the National Radio Astronomy Observatory, PO Box 2, Green Bank, WV 24944, USA 4 LAB/OASU, UMR 5804, CNRS, Université de Bordeaux, 33270 Floirac, France 5 I. Physik. Institut, University of Cologne, 50931 Cologne, Germany 6 IAS, CNRS & Université Paris Sud, Bâtiment 121, 91405 Orsay, France 7 Laboratoire d’Astrophysique de Grenoble, Université Joseph Fourier, CNRS, BP 53, 38041 Grenoble Cedex, France 8 International Centre for Radio Astronomy Research, Curtin University, GPO Box U1987, Perth, WA 6845, Australia 9 European Southern Observatory, Karl-Schwarzschild-Str. 2, 85748 Garching, Germany 10 School of Physics and Astronomy, University of Leeds, Leeds, LS2 9JT, UK Received 27 June 2014 / Accepted 18 December 2015 ABSTRACT Aims. NGC 6334 and NGC 6357 are amongst the most active, optically visible Galactic star-forming complexes. They are composed of several H ii regions that have a significant impact on their surrounding. The aim of this paper is to present a kinematic study of the optical H ii regions that belong to NGC 6334 and NGC 6357. -
Annual Report 1979
ANNUAL REPORT 1979 EUROPEAN SOUTHERN OBSERVATORY Cover Photograph This image is the result 0/ computer analysis through the ESO image-processing system 0/ the interaeting pair 0/galaxies ES0273-JG04. The spiral arms are disturbed by tidal/orces. One 0/ the two spirals exhibits Sey/ert characteristics. The original pfate obtained at the prime/ocus 0/ the 3.6 m telescope by S. Laustsen has been digitized with the new PDS machine in Geneva. ANNUAL REPORT 1979 presented to the Council by the Director-General, Prof. Dr. L. Woltjer Organisation Europeenne pour des Recherehes Astronomiques dans I'Hemisphere Austral EUROPEAN SOUTHERN OBSERVATORY TABLE OF CONTENTS INTRODUCTION ............................................ 5 RESEARCH................................................. 7 Schmidt Telescope; Sky Survey and Atlas Laboratory .................. 8 Joint Research with Chilean Institutes 9 Conferences and Workshops .................................... 9 FACILITIES Telescopes 11 Instrumentation 12 Image Processing ............................................. 13 Buildings and Grounds 15 FINANCIAL AND ORGANIZATIONAL MATTERS ................ 17 APPENDIXES AppendixI-UseofTeiescopes 22 Appendix II - Programmes 33 Appendix III - Publications ..................................... 47 Appendix IV - Members of Council, Committees and Working Groups for 1980. ................................................... 55 3 INTRODUCTION Several instruments were completed during ihe year, while others progressed weIl. Completed and sent to La Silla for installation -
The Evolution and Simulation of the Outburst from XZ Tauri – a Possible Exor?
A&A 419, 593–598 (2004) Astronomy DOI: 10.1051/0004-6361:20034316 & c ESO 2004 Astrophysics The evolution and simulation of the outburst from XZ Tauri – A possible EXor? D. Coffey1,T.P.Downes2,andT.P.Ray1 1 School of Cosmic Physics, Dublin Institute for Advanced Studies, 5 Merrion Square, Dublin 2, Ireland 2 Dublin City University, Dublin 9, Ireland Received 12 September 2003 / Accepted 19 February 2004 Abstract. We report on multi-epoch HST/WFPC2 images of the XZ Tauri binary, and its outflow, covering the period from 1995 to 2001. Data from 1995 to 1998 have already been published in the literature. Additional images, from 1999, 2000 and 2001 are presented here. These reveal not only further dynamical and morphological evolution of the XZ Tauri outflow but also that the suspected outflow source, XZ Tauri North, has flared in EXor-type fashion. In particular our proper motion studies suggests that the recently discovered bubble-like shock, driven by the the XZ Tauri outflow, is slowing down (its tangential velocity decreasing from 146 km s−1 to 117 km s−1). We also present simulations of the outflow itself, with plausible ambient and outflow parameters, that appear to reproduce not only the dynamical evolution of the flow, but also its shape and emission line luminosity. Key words. ISM: Herbig-Haro objects – ISM: jets and outflows – stars: pre-main sequence – stars: formation – stars: individual: XZ Tau – stars: binaries (including multiple): close 1. Introduction Recent Faint Object Spectrograph (FOS) observations, how- ever, unexpectedly found the northern component to be opti- XZ Tau is a classical T Tauri binary system with a separation of cally brighter (White & Ghez 2001, hereafter WG01), a result . -
Ngc Catalogue Ngc Catalogue
NGC CATALOGUE NGC CATALOGUE 1 NGC CATALOGUE Object # Common Name Type Constellation Magnitude RA Dec NGC 1 - Galaxy Pegasus 12.9 00:07:16 27:42:32 NGC 2 - Galaxy Pegasus 14.2 00:07:17 27:40:43 NGC 3 - Galaxy Pisces 13.3 00:07:17 08:18:05 NGC 4 - Galaxy Pisces 15.8 00:07:24 08:22:26 NGC 5 - Galaxy Andromeda 13.3 00:07:49 35:21:46 NGC 6 NGC 20 Galaxy Andromeda 13.1 00:09:33 33:18:32 NGC 7 - Galaxy Sculptor 13.9 00:08:21 -29:54:59 NGC 8 - Double Star Pegasus - 00:08:45 23:50:19 NGC 9 - Galaxy Pegasus 13.5 00:08:54 23:49:04 NGC 10 - Galaxy Sculptor 12.5 00:08:34 -33:51:28 NGC 11 - Galaxy Andromeda 13.7 00:08:42 37:26:53 NGC 12 - Galaxy Pisces 13.1 00:08:45 04:36:44 NGC 13 - Galaxy Andromeda 13.2 00:08:48 33:25:59 NGC 14 - Galaxy Pegasus 12.1 00:08:46 15:48:57 NGC 15 - Galaxy Pegasus 13.8 00:09:02 21:37:30 NGC 16 - Galaxy Pegasus 12.0 00:09:04 27:43:48 NGC 17 NGC 34 Galaxy Cetus 14.4 00:11:07 -12:06:28 NGC 18 - Double Star Pegasus - 00:09:23 27:43:56 NGC 19 - Galaxy Andromeda 13.3 00:10:41 32:58:58 NGC 20 See NGC 6 Galaxy Andromeda 13.1 00:09:33 33:18:32 NGC 21 NGC 29 Galaxy Andromeda 12.7 00:10:47 33:21:07 NGC 22 - Galaxy Pegasus 13.6 00:09:48 27:49:58 NGC 23 - Galaxy Pegasus 12.0 00:09:53 25:55:26 NGC 24 - Galaxy Sculptor 11.6 00:09:56 -24:57:52 NGC 25 - Galaxy Phoenix 13.0 00:09:59 -57:01:13 NGC 26 - Galaxy Pegasus 12.9 00:10:26 25:49:56 NGC 27 - Galaxy Andromeda 13.5 00:10:33 28:59:49 NGC 28 - Galaxy Phoenix 13.8 00:10:25 -56:59:20 NGC 29 See NGC 21 Galaxy Andromeda 12.7 00:10:47 33:21:07 NGC 30 - Double Star Pegasus - 00:10:51 21:58:39 -
Arxiv:0809.2073V2
Accepted for publication in The Astronomical Journal A Multi-Epoch HST Study of the Herbig-Haro Flow from XZ Tauri John E. Krist1, Karl R. Stapelfeldt1, J. Jeff Hester2, Kevin Healy2, Steven J. Dwyer3, and Carl L. Gardner4 ABSTRACT We present nine epochs of Hubble Space Telescope optical imaging of the bipolar outflow from the pre-main sequence binary XZ Tauri. Our data monitors the system from 1995 – 2005 and includes emission line images of the flow. The northern lobe appears to be a succession of bubbles, the outermost of which expanded ballistically from 1995 – 1999 but in 2000 began to deform and decelerate along its forward edge. It reached an extent of 6′′ from the binary in 2005. A larger and fainter southern counterbubble was detected for the first time in deep ACS images from 2004. Traces of shocked emission are seen as far as 20′′ south of the binary. The bubble emission nebulosity has a low excitation overall, as traced by the [S II]/Hα line ratio, requiring a nearly comoving surrounding medium that has been accelerated by previous ejections or stellar winds. Within the broad bubbles there are compact emission knots whose alignments and proper motions indicate that collimated jets are ejected from each binary component. The jet from the southern component, XZ Tau A, is aligned with the outflow axis of the bubbles and has tangential knot velocities of 70 – 200 km s−1. Knots in the northern flow are seen to slow and brighten as they approach the forward edge of the outermost arXiv:0809.2073v2 [astro-ph] 18 Sep 2008 bubble.