The GALAH survey: a catalog of carbon enhanced stars and CEMP candidates
Article
Article Title | The GALAH survey: a catalog of carbon enhanced stars and CEMP candidates |
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ERA Journal ID | 1074 |
Article Category | Article |
Authors | Cotar, Klemen (Author), Zwitter, Tomaz (Author), Kos, Janez (Author), Munari, Ulisse (Author), Martell, Sarah L. (Author), Asplund, Martin (Author), Bland-Hawthorn, Joss (Author), de Silva, Gayandhi M. (Author), Freeman, Kenneth C. (Author), Sharma, Sanjib (Author), Anguiano, Borja (Author), Carollo, Daniela (Author), Horner, Jonathan (Author), Lewis, Geraint F. (Author), Nataf, David M. (Author), Nordlander, Thomas (Author), Stello, Denis (Author), Ting, Yuan-Sen (Author), Tinney, Chris (Author), Traven, Gregor (Author) and Wittenmyer, Rob A. (Author) |
Journal Title | Monthly Notices of the Royal Astronomical Society |
Journal Citation | 483 (3), pp. 3196-3212 |
Number of Pages | 17 |
Year | 2019 |
Publisher | Oxford University Press |
Place of Publication | United Kingdom |
ISSN | 0035-8711 |
1365-2966 | |
Digital Object Identifier (DOI) | https://doi.org/10.1093/mnras/sty3155 |
Web Address (URL) | https://academic.oup.com/mnras/article/483/3/3196/5199221 |
Abstract | Swan bands - characteristic molecular absorption features of the C\$_2$ molecule - are a spectroscopic signature of carbon enhanced stars. They can also be used to identify notorious carbon enhanced metal-poor (CEMP) stars. GALAH (GALactic Archaeology with Hermes) is a magnitude limited survey of stars producing high resolution, high signal-to-noise spectra. We use 627.708 GALAH spectra to search for carbon enhanced stars with a supervised and unsupervised classification algorithm, relying on the imprint of the Swan bands. We identified 918 carbon enhanced stars, including 12 already described in the literature. An unbiased selection function of the GALAH survey allows us to perform a population study of carbon enhanced stars. Most of them are giants, out of which we find 28 CEMP candidates. Large fraction of stars with repeated observations show variation in radial velocity, hinting that there is a large fraction of variables among carbon enhanced stars. 32 of detected stars also show strong Lithium enhancement in their spectra. |
Keywords | astrophysics; solar and stellar astrophysics; 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 ©: 2019 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 |
INAF - Astronomical Observatory of Padova, Italy | |
University of New South Wales | |
Australian National University | |
University of Sydney | |
Macquarie University | |
University of Virginia, United States | |
INAF - Astrophysical Observatory of Turin, Italy | |
Centre for Astrophysics | |
Johns Hopkins University, United States | |
Institute for Advanced Study, United States | |
Computational Engineering and Science Research Centre |
https://research.usq.edu.au/item/q518z/the-galah-survey-a-catalog-of-carbon-enhanced-stars-and-cemp-candidates
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