The GALAH survey: accurate radial velocities and library of observed stellar template spectra
Article
Article Title | The GALAH survey: accurate radial velocities and library of observed stellar template spectra |
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ERA Journal ID | 1074 |
Article Category | Article |
Authors | Zwitter, Tomaz (Author), Kos, Janez (Author), Chiavassa, Andrea (Author), Buder, Sven (Author), Traven, Gregor (Author), Cotar, Klemen (Author), Lin, Jane (Author), Asplund, Martin (Author), Bland-Hawthorn, Joss (Author), Casey, Andrew R. (Author), de Silva, Gayandhi (Author), Duong, Ly (Author), Freeman, Kenneth C. (Author), Lind, Karin (Author), Martell, Sarah (Author), D'Orazi, Valentina (Author), Schlesinger, Katharine J. (Author), Simpson, Jeffrey D. (Author), Sharma, Sanjib (Author), Zucker, Daniel B. (Author), Anguiano, Borja (Author), Casagrande, Luca (Author), Collet, Remo (Author), Horner, Jonathan (Author), Ireland, Michael J. (Author), Kafle, Prajwal R. (Author), Lewis, Geraint (Author), Munari, Ulisse (Author), Nataf, David M. (Author), Ness, Melissa (Author), Nordlander, Thomas (Author), Stello, Dennis (Author), Ting, Yuan-Sen (Author), Tinney, Chris G. (Author), Watson, Fred (Author), Wittenmyer, Rob A. (Author) and Zerjal, Marusa (Author) |
Journal Title | Monthly Notices of the Royal Astronomical Society |
Journal Citation | 481 (1), pp. 645-654 |
Number of Pages | 10 |
Year | 2018 |
Publisher | Oxford University Press |
Place of Publication | United Kingdom |
ISSN | 0035-8711 |
1365-2966 | |
Digital Object Identifier (DOI) | https://doi.org/10.1093/mnras/sty2293 |
Web Address (URL) | https://academic.oup.com/mnras/article/481/1/645/5078395 |
Abstract | GALAH is a large-scale magnitude-limited southern stellar spectroscopic survey. Its second data release (GALAH DR2) provides values of stellar parameters and abundances of 23 elements for 342 682 stars (Buder et al.). Here we add a description of the public release of radial velocities with a typical accuracy of 0.1 km s<SUP>-1</SUP> for 336 215 of these stars, achievable due to the large wavelength coverage, high resolving power, and good signal-to-noise ratio of the observed spectra, but also because convective motions in stellar atmosphere and gravitational redshift from the star to the observer are taken into account. In the process we derive medians of observed spectra that are nearly noiseless, as they are obtained from between 100 and 1116 observed spectra belonging to the same bin with a width of 50 K in temperature, 0.2 dex in gravity, and 0.1 dex in metallicity. Publicly released 1181 median spectra have a resolving power of 28 000 and trace the well-populated stellar types with metallicities between -0.6 and +0.3. Note that radial velocities from GALAH are an excellent match to the accuracy of velocity components along the sky plane derived by Gaia for the same stars. The level of accuracy achieved here is adequate for studies of dynamics within stellar clusters, associations, and streams in the Galaxy. So it may be relevant for studies of the distribution of dark matter. |
Keywords | data analysis; observational; surveys; fundamental parameters; astrophysics; solar and stellar astrophysics; astrophysics of galaxies |
ANZSRC Field of Research 2020 | 510109. Stellar astronomy and planetary systems |
Public Notes | This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2018 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved. |
Institution of Origin | University of Southern Queensland |
Byline Affiliations | University of Ljubljana, Slovenia |
University of Sydney | |
Cote d'Azur University, France | |
Max Planck Society, Germany | |
Australian National University | |
Monash University | |
University of New South Wales | |
National Institute for Astrophysics, Italy | |
Australian Astronomical Observatory, Australia | |
Macquarie University | |
University of Virginia, United States | |
Aarhus University, Denmark | |
Computational Engineering and Science Research Centre | |
University of Western Australia | |
INAF - Astronomical Observatory of Padova, Italy | |
Johns Hopkins University, United States | |
Institute for Advanced Study, United States |
https://research.usq.edu.au/item/q5189/the-galah-survey-accurate-radial-velocities-and-library-of-observed-stellar-template-spectra
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