The GALAH survey: a catalog of carbon enhanced stars and CEMP candidates

Cotar, Klemen and Zwitter, Tomaz and Kos, Janez and Munari, Ulisse and Martell, Sarah L. and Asplund, Martin and Bland-Hawthorn, Joss and de Silva, Gayandhi M. and Freeman, Kenneth C. and Sharma, Sanjib and Anguiano, Borja and Carollo, Daniela and Horner, Jonathan and Lewis, Geraint F. and Nataf, David M. and Nordlander, Thomas and Stello, Denis and Ting, Yuan-Sen and Tinney, Chris and Traven, Gregor and Wittenmyer, Rob A. (2019) The GALAH survey: a catalog of carbon enhanced stars and CEMP candidates. Monthly Notices of the Royal Astronomical Society, 483 (3). pp. 3196-3212. ISSN 0035-8711

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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.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Published version deposited in accordance with the copyright policy of the publisher.
Faculty/School / Institute/Centre: Current - Faculty of Health, Engineering and Sciences - School of Agricultural, Computational and Environmental Sciences
Date Deposited: 22 Feb 2019 04:45
Last Modified: 05 Jun 2019 02:36
Uncontrolled Keywords: astrophysics; solar and stellar astrophysics; galaxies
Fields of Research : 02 Physical Sciences > 0201 Astronomical and Space Sciences > 020110 Stellar Astronomy and Planetary Systems
Identification Number or DOI: 10.1093/mnras/sty3155
URI: http://eprints.usq.edu.au/id/eprint/35799

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