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The GALAH survey : A catalogue of carbon-enhanced stars and CEMP candidates

Cotar, Klemen ; Zwitter, Tomaz ; Kos, Janez ; Munari, Ulisse ; Martell, Sarah L. ; Asplund, Martin ; Bland-Hawthorn, Joss ; Buder, Sven ; De Silva, Gayandhi M. and Freeman, Kenneth C. , et al. (2019) In Monthly Notices of the Royal Astronomical Society 483(3). p.3196-3212
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... (More)

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.

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subject
keywords
Catalogues, Methods: data analysis, Stars: abundances, Stars: carbon
in
Monthly Notices of the Royal Astronomical Society
volume
483
issue
3
pages
17 pages
publisher
Oxford University Press
external identifiers
  • scopus:85067193992
ISSN
0035-8711
DOI
10.1093/mnras/sty3155
language
English
LU publication?
yes
id
4f71bb84-2a74-4f2f-a5b7-3ce9d1cc636d
date added to LUP
2019-07-04 10:49:28
date last changed
2020-01-13 02:11:33
@article{4f71bb84-2a74-4f2f-a5b7-3ce9d1cc636d,
  abstract     = {<p>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.</p>},
  author       = {Cotar, Klemen and Zwitter, Tomaz and Kos, Janez and Munari, Ulisse and Martell, Sarah L. and Asplund, Martin and Bland-Hawthorn, Joss and Buder, Sven 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.},
  issn         = {0035-8711},
  language     = {eng},
  number       = {3},
  pages        = {3196--3212},
  publisher    = {Oxford University Press},
  series       = {Monthly Notices of the Royal Astronomical Society},
  title        = {The GALAH survey : A catalogue of carbon-enhanced stars and CEMP candidates},
  url          = {http://dx.doi.org/10.1093/mnras/sty3155},
  doi          = {10.1093/mnras/sty3155},
  volume       = {483},
  year         = {2019},
}