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Journal Article

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

MPS-Authors

Čotar,  Klemen
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Zwitter,  Tomaž
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Kos,  Janez
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Munari,  Ulisse
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Martell,  Sarah L.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Asplund,  Martin
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Bland-Hawthorn,  Joss
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Buder,  Sven
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

de Silva,  Gayandhi M.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Freeman,  Kenneth C.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Sharma,  Sanjib
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Anguiano,  Borja
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Carollo,  Daniela
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Horner,  Jonathan
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Lewis,  Geraint F.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Nataf,  David M.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Nordlander,  Thomas
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Stello,  Denis
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Ting,  Yuan-Sen
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Tinney,  Chris
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Traven,  Gregor
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Wittenmyer,  Rob A.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Collaboration,  Galah
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

External Resource

https://ui.adsabs.harvard.edu/abs/2019MNRAS.483.3196C
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Citation

Čotar, K., Zwitter, T., Kos, J., Munari, U., Martell, S. L., Asplund, M., et al. (2019). The GALAH survey: a catalogue of carbon-enhanced stars and CEMP candidates. Monthly Notices of the Royal Astronomical Society, 483, 3196-3212.


Cite as: https://hdl.handle.net/21.11116/0000-0005-D124-6
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 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.