{"about":{"site":"https://codewithpapers.app","non_affiliation":"Code with Papers and Syntology are not affiliated with, endorsed by, or sponsored by Papers with Code, Meta, or the pwc-archive mirror.","licence":"CC BY-SA 4.0","licence_url":"https://creativecommons.org/licenses/by-sa/4.0/legalcode","attribution":"https://codewithpapers.app/attribution","modified":"archive material modified by Syntology; see the attribution page"},"url":"/paper/the-galah-survey-a-catalogue-of-carbon","title":"The GALAH survey: a catalogue of carbon-enhanced stars and CEMP candidates","arxiv_id":"1807.07977","date":"2018-07-20","proceeding":null,"authors":["Klemen Čotar","Tomaž Zwitter","Janez Kos","Ulisse Munari","Sarah L. Martell","Martin Asplund","Joss Bland-Hawthorn","Sven Buder","Gayandhi M. De Silva","Kenneth C. Freeman","Sanjib Sharma","Borja Anguiano","Daniela Carollo","Jonathan Horner","Geraint F. Lewis","David M. Nataf","Thomas Nordlander","Denis Stello","Yuan-Sen Ting","Chris Tinney","Gregor Traven","Rob A. Wittenmyer"],"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 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.","url_abs":"http://arxiv.org/abs/1807.07977v2","url_pdf":"http://arxiv.org/pdf/1807.07977v2.pdf","source":{"archive":"pwc-archive (Hugging Face), CC BY-SA 4.0","snapshot":"2025-07-28","licence_url":"https://creativecommons.org/licenses/by-sa/4.0/legalcode","row_kind":"links_only","authors_date_abstract":"arXiv metadata, CC0 1.0 (https://info.arxiv.org/help/license), from the Kaggle arXiv metadata snapshot of 2026-09-12"},"code_links":[{"paper_slug":"the-galah-survey-a-catalogue-of-carbon","repo_url":"https://github.com/kcotar/GALAH-survey-Carbon-enhanced-stars","is_official":1,"mentioned_in_paper":0,"mentioned_in_github":0,"framework":"none","reach":null}],"tasks":[],"methods":[],"datasets_introduced":[],"methods_introduced":[],"results":[],"syntology":{"atlas_url":null,"mcp":null,"developers":"https://syntology.ai/developers"},"arxiv_metadata":null,"syntology_extracted_results":null}