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A&A 531, A133 (2011) Astronomy DOI: 10.1051/0004-6361/201014213 & c ESO 2011 Astrophysics High-resolution spectroscopic observations of the metal-poor, chemically peculiar, and high velocity Fehrenbach & Duflot star, N. A. Drake1 and C. B. Pereira2 1 Sobolev Astronomical Institute, St. Petersburg State University, Universitetski pr. 28, St. Petersburg 198504, Russia 2 Observatório Nacional, Rua José Cristino, 77, CEP 20921-400, São Cristóvão, Rio de Janeiro-RJ, Brazil e-mail: [drake,claudio]@on.br Received 6 February 2010 / Accepted 5 May 2011 ABSTRACT Aims. We determine the atmospheric parameters and abundance pattern of the chemically peculiar metal-poor Fehrenbach & Duflot (Feh-Duf) star to more clearly understand its evolutionary state and the nature of the s-element enhancement in this star. Methods. Its atmospheric parameters and chemical abundances were determined using high resolution optical spectroscopy and employing the local-thermodynamic-equilibrium model atmospheres of Kurucz and spectral analysis code MOOG. Results. The derived abundances show that the Feh-Duf star is a low-metallicity ([Fe/H] = −1.93) star with high carbon and heavy s-element abundances, while the abundance of the light s-process element yttrium is low ([Y/Fe] = −0.07). The oxygen abundance is lower than for Galactic halo stars of similar metallicity.We conclude that the Feh-Duf star could be a CH star with C/O = 1.3. Another possibility is that the Feh-Duf star could be an early-AGB star. The Fehrenbach & Duflot star is also a lead star with [Pb/Ce] =+0.69. −1 In addition, it displays an extreme retrograde motion (VGRF = −259 km s ), which in combination with its underabundance of α-elements suggests that this star may have been captured by the Milky Way galaxy. -
Publications for Geraint Lewis 2021 2020
Publications for Geraint Lewis 2021 R., Horner, J., Wright, D., Carter, B., Morton, T., Spina, L., Li, T., Koposov, S., Erkal, D., Ji, A., Shipp, N., Hilmi, T., Bland-Hawthorn, J., Hayden, M., Lewis, G., Sharma, S., Kuehn, K., Pace, A., Lewis, G., Mackey, D., Wan, Z., Bland- Simpson, J., et al (2021). The GALAH Survey: Using galactic Hawthorn, J., Sharma, S., et al (2021). Broken into pieces: archaeology to refine our knowledge of TESS target stars. ATLAS and Aliqa Uma as one single stream. The Astrophysical Monthly Notices of the Royal Astronomical Society, 504(4), Journal, 911(2), 149. <a href="http://dx.doi.org/10.3847/1538- 4968-4989. <a 4357/abeb18">[More Information]</a> href="http://dx.doi.org/10.1093/mnras/stab1052">[More Information]</a> Sharma, S., Hayden, M., Bland-Hawthorn, J., Stello, D., Buder, S., Zinn, J., Kallinger, T., Asplund, M., De Silva, G., D'Orazi, Oliver, W., Elahi, P., Lewis, G., Power, C. (2021). The V., Kos, J., Lewis, G., Lin, J., Zucker, D., Chen, B., Huber, D., hierarchical structure of galactic haloes: Classification and Kafle, P., Khanna, S., et al (2021). Fundamental relations for characterization with halo-optics. Monthly Notices of the Royal the velocity dispersion of stars in the Milky Way. Monthly Astronomical Society, 501(3), 4420-4437. <a Notices of the Royal Astronomical Society, 506(2), 1761-1776. href="http://dx.doi.org/10.1093/mnras/staa3879">[More <a href="http://dx.doi.org/10.1093/mnras/stab1086">[More Information]</a> Information]</a> Arentsen, A., Starkenburg, E., Aguado, D., Martin, N., Placco, Wiseman, P., Sullivan, M., Smith, M., Frohmaier, C., Vincenzi, V., Carlberg, R., Gonz�lez Hern�ndez, J., Hill, V., M., Graur, O., Popovic, B., Armstrong, P., Brout, D., Davis, T., Jablonka, P., Kordopatis, G., Lewis, G., Wan, Z., et al (2021). -
Exploration of the Moon
Exploration of the Moon The physical exploration of the Moon began when Luna 2, a space probe launched by the Soviet Union, made an impact on the surface of the Moon on September 14, 1959. Prior to that the only available means of exploration had been observation from Earth. The invention of the optical telescope brought about the first leap in the quality of lunar observations. Galileo Galilei is generally credited as the first person to use a telescope for astronomical purposes; having made his own telescope in 1609, the mountains and craters on the lunar surface were among his first observations using it. NASA's Apollo program was the first, and to date only, mission to successfully land humans on the Moon, which it did six times. The first landing took place in 1969, when astronauts placed scientific instruments and returnedlunar samples to Earth. Apollo 12 Lunar Module Intrepid prepares to descend towards the surface of the Moon. NASA photo. Contents Early history Space race Recent exploration Plans Past and future lunar missions See also References External links Early history The ancient Greek philosopher Anaxagoras (d. 428 BC) reasoned that the Sun and Moon were both giant spherical rocks, and that the latter reflected the light of the former. His non-religious view of the heavens was one cause for his imprisonment and eventual exile.[1] In his little book On the Face in the Moon's Orb, Plutarch suggested that the Moon had deep recesses in which the light of the Sun did not reach and that the spots are nothing but the shadows of rivers or deep chasms. -
CS 30322-023: an Ultra Metal-Poor TP-AGB Star?
Astronomy & Astrophysics manuscript no. 4802 c ESO 2018 September 7, 2018 CS 30322-023: an ultra metal-poor TP-AGB star?⋆ T. Masseron1, S. Van Eck2, B. Famaey2, S. Goriely2, B. Plez1, L. Siess2, T. C. Beers3, F. Primas4, and A. Jorissen2 1 GRAAL, UMR 5024 CNRS, Universit´ede Montpellier-II, France 2 Institut d’Astronomie et d’Astrophysique, Universit´eLibre de Bruxelles, CP 226, Boulevard du Triomphe, B-1050 Bruxelles, Belgium 3 Department of Physics and Astronomy, Center for the Study of Cosmic Evolution (CSCE) and Joint Institute for Nuclear Astrophysics (JINA), Michigan State University, East Lansing, MI 48824-1116, USA 4 European Southern Observatory, K. Schwarzschild Straße 2, D-85748 Garching bei M¨unchen Received January 3, 2006 / Accepted May 5, 2006 ABSTRACT Context. The remarkable properties of CS 30322-023 became apparent during the course of a high-resolution spectroscopic study of a sample of 23 carbon-enhanced, metal-poor (CEMP) stars. Aims. This sample is studied in order to gain a better understanding of s- and r-process nucleosynthesis at low metallicity, and to investigate the role of duplicity. Methods. High-resolution UVES spectra have been obtained, and abundances are derived using 1-D, plane-parallel OSMARCS models under the LTE hypothesis. The derived atmospheric parameters and observed abundances are compared to evolutionary tracks and nucleosynthesis predictions to infer the evolutionary status of CS 30322-023. Results. CS 30322-023 is remarkable in having the lowest surface gravity (log g ≤ −0.3) among the metal-poor stars studied to date. As a result of its rather low temperature (4100 K), abundances could be derived for 35 chemical elements; the abundance pattern of CS 30322-023 is one of the most well-specified of all known extremely metal-poor stars. -
Lifetimes of Interstellar Dust from Cosmic Ray Exposure Ages of Presolar Silicon Carbide
Lifetimes of interstellar dust from cosmic ray exposure ages of presolar silicon carbide Philipp R. Hecka,b,c,1, Jennika Greera,b,c, Levke Kööpa,b,c, Reto Trappitschd, Frank Gyngarde,f, Henner Busemanng, Colin Madeng, Janaína N. Ávilah, Andrew M. Davisa,b,c,i, and Rainer Wielerg aRobert A. Pritzker Center for Meteoritics and Polar Studies, The Field Museum of Natural History, Chicago, IL 60605; bChicago Center for Cosmochemistry, The University of Chicago, Chicago, IL 60637; cDepartment of the Geophysical Sciences, The University of Chicago, Chicago, IL 60637; dNuclear and Chemical Sciences Division, Lawrence Livermore National Laboratory, Livermore, CA 94550; ePhysics Department, Washington University, St. Louis, MO 63130; fCenter for NanoImaging, Harvard Medical School, Cambridge, MA 02139; gInstitute of Geochemistry and Petrology, ETH Zürich, 8092 Zürich, Switzerland; hResearch School of Earth Sciences, The Australian National University, Canberra, ACT 2601, Australia; and iEnrico Fermi Institute, The University of Chicago, Chicago, IL 60637 Edited by Mark H. Thiemens, University of California San Diego, La Jolla, CA, and approved December 17, 2019 (received for review March 15, 2019) We determined interstellar cosmic ray exposure ages of 40 large ago. These grains are identified as presolar by their large isotopic presolar silicon carbide grains extracted from the Murchison CM2 anomalies that exclude an origin in the Solar System (13, 14). meteorite. Our ages, based on cosmogenic Ne-21, range from 3.9 ± Presolar stardust grains are the oldest known solid samples 1.6 Ma to ∼3 ± 2 Ga before the start of the Solar System ∼4.6 Ga available for study in the laboratory, represent the small fraction ago. -
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 ................................................................................ -
Eyes Skies Full En.Pdf
1 00:00:05,240 --> 00:00:08,800 By taking our sense of sight far beyond the realm of our forebears' 2 00:00:08,880 --> 00:00:13,200 imagination, these wonderful instruments, the telescopes, open the way to 3 00:00:13,280 --> 00:00:17,240 a deeper and more perfect understanding of nature. - René Descartes, 1637 4 00:00:17,720 --> 00:00:22,520 For millennia mankind gazed out into the mesmerising night sky 5 00:00:22,600 --> 00:00:28,320 without recognising the stars of our own Milky Way Galaxy as other suns 6 00:00:28,400 --> 00:00:33,400 or the billions of sister galaxies making up the rest of our Universe 7 00:00:35,440 --> 00:00:38,760 or that we are merely punctuation in the Universe’s 8 00:00:38,840 --> 00:00:42,480 13.7 billion year-long story. 9 00:00:42,560 --> 00:00:46,080 With only our eyes as observing tools we had no means of 10 00:00:46,160 --> 00:00:50,120 finding solar systems around other stars, or of determining 11 00:00:50,200 --> 00:00:55,000 whether life exists elsewhere in the Universe. 12 00:00:58,080 --> 00:01:00,320 Today we are well on our way to unravelling many of the 13 00:01:00,400 --> 00:01:03,520 mysteries of the Universe, living in what may be the most remarkable 14 00:01:03,600 --> 00:01:05,920 age of astronomical discovery. -
Australian Sky & Telescope
TRANSIT MYSTERY Strange sights BINOCULAR TOUR Dive deep into SHOOT THE MOON Take amazing as Mercury crosses the Sun p28 Virgo’s endless pool of galaxies p56 lunar images with your smartphone p38 TEST REPORT Meade’s 25-cm LX600-ACF P62 THE ESSENTIAL MAGAZINE OF ASTRONOMY Lasers and advanced optics are transforming astronomy p20 HOW TO BUY THE RIGHT ASTRO CAMERA p32 p14 ISSUE 93 MAPPING THE BIG BANG’S COSMIC ECHOES $9.50 NZ$9.50 INC GST LPI-GLPI-G LUNAR,LUNAR, PLANETARYPLANETARY IMAGERIMAGER ANDAND GUIDERGUIDER ASTROPHOTOGRAPHY MADE EASY. Let the LPI-G unleash the inner astrophotographer in you. With our solar, lunar and planetary guide camera, experience the universe on a whole new level. 0Image Sensor:'+(* C O LOR 0 Pixel Size / &#*('+ 0Frames per second/Resolution• / • / 0 Image Format: #,+$)!&))'!,# .# 0 Shutter%,*('#(%%#'!"-,,* 0Interface: 0Driver: ASCOM compatible 0GuiderPort: 0Color or Monochrome Models (&#'!-,-&' FEATURED DEALERS: MeadeTelescopes Adelaide Optical Centre | www.adelaideoptical.com.au MeadeInstrument The Binocular and Telescope Shop | www.bintel.com.au MeadeInstruments www.meade.com Sirius Optics | www.sirius-optics.com.au The device to free you from your handbox. With the Stella adapter, you can wirelessly control your GoTo Meade telescope at a distance without being limited by cord length. Paired with our new planetarium app, *StellaAccess, astronomers now have a graphical interface for navigating the night sky. STELLA WI-FI ADAPTER / $#)'$!!+#!+ #$#)'#)$##)$#'&*' / (!-')-$*')!($%)$$+' "!!$#$)(,#%',).( StellaAccess app. Available for use on both phones and tablets. /'$+((()$!'%!#)'*")($'!$)##!'##"$'$*) stars, planets, celestial bodies and more /$,'-),',### -' ($),' /,,,$"$')*!!!()$$"%)!)!($%( STELLA is controlled with Meade’s planetarium app, StellaAccess. Available for purchase for both iOS S and Android systems. -
Messenger-No117.Pdf
ESO WELCOMES FINLANDINLAND AS ELEVENTH MEMBER STAATE CATHERINE CESARSKY, ESO DIRECTOR GENERAL n early July, Finland joined ESO as Education and Science, and exchanged which started in June 2002, and were con- the eleventh member state, following preliminary information. I was then invit- ducted satisfactorily through 2003, mak- II the completion of the formal acces- ed to Helsinki and, with Massimo ing possible a visit to Garching on 9 sion procedure. Before this event, howev- Tarenghi, we presented ESO and its scien- February 2004 by the Finnish Minister of er, Finland and ESO had been in contact tific and technological programmes and Education and Science, Ms. Tuula for a long time. Under an agreement with had a meeting with Finnish authorities, Haatainen, to sign the membership agree- Sweden, Finnish astronomers had for setting up the process towards formal ment together with myself. quite a while enjoyed access to the SEST membership. In March 2000, an interna- Before that, in early November 2003, at La Silla. Finland had also been a very tional evaluation panel, established by the ESO participated in the Helsinki Space active participant in ESO’s educational Academy of Finland, recommended Exhibition at the Kaapelitehdas Cultural activities since they began in 1993. It Finland to join ESO “anticipating further Centre with approx. 24,000 visitors. became clear, that science and technology, increase in the world-standing of ESO warmly welcomes the new mem- as well as education, were priority areas Astronomy in Finland”. In February 2002, ber country and its scientific community for the Finnish government. we were invited to hold an information that is renowned for its expertise in many Meanwhile, the optical astronomers in seminar on ESO in Helsinki as a prelude frontline areas. -
Astronomy Astrophysics
A&A 432, 515–529 (2005) Astronomy DOI: 10.1051/0004-6361:20040331 & c ESO 2005 Astrophysics PAH charge state distribution and DIB carriers: Implications from the line of sight toward HD 147889, R. Ruiterkamp1,N.L.J.Cox2,M.Spaans3, L. Kaper2,B.H.Foing4,F.Salama5, and P. Ehrenfreund2 1 Leiden Observatory, PO Box 9513, 2300 RA Leiden, The Netherlands e-mail: [email protected] 2 Institute Anton Pannekoek, Kruislaan 403, 1098 SJ Amsterdam, The Netherlands 3 Kapteyn Astronomical Institute, PO Box 800, 9700 AV Groningen, The Netherlands 4 ESA Research and Scientific Support Department, PO Box 299, 2200 AG Noordwijk, The Netherlands 5 Space Science Division, NASA Ames Research Center, Mail Stop 245-6, Moffett Field, California 94035, USA Received 25 February 2004 / Accepted 29 September 2004 Abstract. We have computed physical parameters such as density, degree of ionization and temperature, constrained by a large observational data set on atomic and molecular species, for the line of sight toward the single cloud HD 147889. Diffuse interstellar bands (DIBs) produced along this line of sight are well documented and can be used to test the PAH hypothesis. To this effect, the charge state fractions of different polycyclic aromatic hydrocarbons (PAHs) are calculated in HD 147889 as a function of depth for the derived density, electron abundance and temperature profile. As input for the construction of these charge state distributions, the microscopic properties of the PAHs, e.g., ionization potential and electron affinity, are determined for a series of symmetry groups. The combination of a physical model for the chemical and thermal balance of the gas toward HD 147889 with a detailed treatment of the PAH charge state distribution, and laboratory and theoretical data on specific PAHs, allow us to compute electronic spectra of gas phase PAH molecules and to draw conclusions about the required properties of PAHs as DIB carriers. -
Una Aproximación Física Al Universo Local De Nebadon
4 1 0 2 local Nebadon de Santiago RodríguezSantiago Hernández Una aproximación física al universo (160.1) 14:5.11 La curiosidad — el espíritu de investigación, el estímulo del descubrimiento, el impulso a la exploración — forma parte de la dotación innata y divina de las criaturas evolutivas del espacio. Tabla de contenido 1.-Descripción científica de nuestro entorno cósmico. ............................................................................. 3 1.1 Lo que nuestros ojos ven. ................................................................................................................ 3 1.2 Lo que la ciencia establece ............................................................................................................... 4 2.-Descripción del LU de nuestro entorno cósmico. ................................................................................ 10 2.1 Universo Maestro ........................................................................................................................... 10 2.2 Gran Universo. Nivel Espacial Superunivesal ................................................................................. 13 2.3 Orvonton. El Séptimo Superuniverso. ............................................................................................ 14 2.4 En el interior de Orvonton. En la Vía Láctea. ................................................................................. 18 2.5 En el interior de Orvonton. Splandon el 5º Sector Mayor ............................................................ 19 -
School of Physics Publications 2007
School of Physics Publications 2007 Books Karnutsch, C 2007, Low threshold organic thin-film laser devices, Göttingen, 1 Ostrikov, K, Xu, S 2007, Plasma-Aided Nanofabrication: From Plasma Sources to Nanoassembly, Weinheim, Germany Book Chapters Beck, R, Gaensler, B M, Feretti, L 2007, SKA and the Magnetic Universe, Exploring the Cosmic Frontier: Astrophysical Instruments for the 21st Century, Springer-Verlag Berlin Heidelberg, Berlin Heidelberg, 103-108 Bilek, M, Powles, R C, McKenzie, D R 2007, Treatment of polymeric biomaterials by ion implantation, Biomaterials and Surface Modification, Research Signpost, India, 205-248 Britton, S C, New, P B, Roberts, A L, Sharma, M D 2007, Investigating students' ability totransfer mathematics, Transforming a university: the scholarship of teaching and learning in practice, University of Sydney Press, NSW, Australia, 127-140 Dey, C J, Berger, C, Foran, B, Foran, M, Joske, R, Lenzen, M, Wood, R J 2007, Household environmental pressure from consumption: an Australian environmental atlas, Water Wind Art and Debate -How environmental concerns impacton disciplinary research, Sydney University Press, Sydney, 1, 280-314 Eggleton, B J, Slusher, R 2007, Nonlinear pulse propagation in one-dimensional photonic bandgap structures, Nonlinear photonic bandgap materials, Springer Khoukhi, M, Maruyama, S, Bosi, S G, Komiya, A 2007, A Simple Approach for Calculating the Optical Constants of a Clear Glass Window from 0.19 to 5 um, Recent Developments in Solar Energy, Nova Science Publishers, Inc, New York, 289-297