Journal article
The GALAH survey : A catalogue of carbon-enhanced stars and CEMP candidates
Monthly notices of the Royal Astronomical Society, Vol.483(3), pp.3196-3212
03/01/2019
DOI: 10.1093/mnras/sty3155
Abstract
Swan bands-characteristic molecular absorption features of the C2 molecule-are a spectroscopic signature of carbon-enhanced stars. They can also be used to identify carbonenhanced metal-poor (CEMP) stars. The GALAH (GALactic Archaeology with Hermes) is a magnitude-limited survey of stars producing high-resolution, high-signal-to-noise spectra. We used 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. A large fraction of our carbon-enhanced stars with repeated observations show variation in radial velocity, hinting that there is a large fraction of variables among them. 32 of the detected stars also show strong Lithium enhancement in their spectra.
Details
- Title: Subtitle
- The GALAH survey : A catalogue of carbon-enhanced stars and CEMP candidates
- Creators
- Klemen Cotar - University of LjubljanaTomaz Zwitter - University of LjubljanaJanez Kos - University of LjubljanaUlisse Munari - Osservatorio Astronomico di PadovaSarah L. Martell - UNSW SydneyMartin Asplund - ARC Centre of Excellence for All-sky AstrophysicsJoss Bland-Hawthorn - The University of SydneySven Buder - Max Planck Institute for AstronomyGayandhi M. De Silva - Macquarie UniversityKenneth C. Freeman - Australian National UniversitySanjib Sharma - The University of SydneyBorja Anguiano - University of VirginiaDaniela Carollo - Osservatorio Astrofisico di TorinoJonathan Horner - University of Southern QueenslandGeraint F. Lewis - The University of SydneyDavid M. Nataf - Johns Hopkins UniversityThomas Nordlander - ARC Centre of Excellence for All-sky AstrophysicsDenis Stello - The University of SydneyYuan Sen Ting - Institute for Advanced StudyChris Tinney - UNSW SydneyGregor Traven - University of LjubljanaRob A. Wittenmyer - University of Southern QueenslandGALAH Collaboration
- Resource Type
- Journal article
- Publication Details
- Monthly notices of the Royal Astronomical Society, Vol.483(3), pp.3196-3212
- DOI
- 10.1093/mnras/sty3155
- ISSN
- 0035-8711
- eISSN
- 1365-2966
- Language
- English
- Date published
- 03/01/2019
- Academic Unit
- Physics and Astronomy
- Record Identifier
- 9984701733902771
Metrics
18 Record Views