TY - JOUR
T1 - The GALAH survey: a catalogue of carbon-enhanced stars and CEMP candidates
AU - Cotar, K.
AU - Zwitter, T
AU - Kos, Janez
AU - Munari, U
AU - Martell, Sarah
AU - Asplund, Martin
AU - Bland-Hawthorn, Joss
AU - Buder, Sven
AU - De Silva, Gayandhi M
AU - Freeman, Kenneth
AU - Sharma, Sanjib
AU - Anguiano, Borja
AU - Nataf, David M
AU - Nordlander, Thomas
AU - Stello, Dennis
AU - Ting, Yuan-Sen
PY - 2019
Y1 - 2019
N2 - 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 carbon-enhanced 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.
AB - 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 carbon-enhanced 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.
U2 - 10.1093/mnras/sty3155
DO - 10.1093/mnras/sty3155
M3 - Article
SN - 1365-2966
VL - 483
SP - 3196
EP - 3212
JO - Monthly Notices of the Royal Astronomical Society
JF - Monthly Notices of the Royal Astronomical Society
IS - 3
ER -