GALAH carbon-enhanced stars & CEMP candidates J/MNRAS/483/3196 ivo://CDS.VizieR/J/MNRAS/483/3196 doi:10.26093/cds/vizier.74833196 CDS Cotar K. Zwitter T. Kos J. Munari U. Martell S.L. Asplund M.,Bland-Hawthorn J. Buder S. de Silva G.M. Freeman K.C. Sharma S.,Anguiano B. Carollo D. Horner J. Lewis G.F. Nataf D.M. Nordlander T.,Stello D. Ting Y.-S. Tinney C. Traven G. Wittenmyer R.A.,Galah Collaboration 2024-08-19T20:15:56Z 2019-01-02T07:01:52Z CDS support team CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France cds-question@unistra.fr surveys carbon-stars effective-temperature metallicity 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 627708 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. 2019MNRAS.483.3196C https://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/483/3196 Catalog Research IsServedBy TAP VizieR generic service IsServedBy Conesearch service related-to III/227 : General Catalog of galactic Carbon stars, 3d Ed. J/ApJS/105/419 : Spectral Atlas of Carbon Stars (Barnbaum+ 1996) J/other/Ap/41.356 : FBS 10th list of red stars (Gigoyan+, 1998) J/AJ/124/1651 : Faint high-latitude carbon stars SDSS photom. J/AJ/127/2838 : Faint high-latitude carbon stars SDSS photom. J/A+A/473/143 : RVs of C stars near Galactic plane (Demers+, 2007) J/ApJ/765/12 : Carbon stars & DQ white dwarfs from SDSS-DR7+DR8 J/other/RAA/15.1671 : New carbon stars from LAMOST survey (Si+, 2015) J/A+A/589/A36 : Carbon stars spectra and photometry values http://galah-survey.org/ : GALAH home page https://cds.unistra.fr/vizier-org/licences_vizier.html https://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/483/3196 https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/483/3196 http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/483/3196 https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/483/3196 https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/483/3196 http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/483/3196 GET text/xml+votable https://tapvizier.cds.unistra.fr/TAPVizieR/tap Cone search capability for table J/MNRAS/483/3196/galah-cc (GALAH carbon CEMP catalogue of detected objects and objects matched with multiple literature sources) https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/483/3196/galah-cc? https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/483/3196/galah-cc? http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/483/3196/galah-cc? 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Should Not be used for identification. meta.record int GaiaDR2 ? Gaia DR2 identifier (source_id) meta.id nullable GALAH GALAH unique per observation id meta.id;obs RAJ2000 Right ascension from 2MASS (J2000) deg pos.eq.ra;meta.main DEJ2000 Declination from 2MASS (J2000) deg pos.eq.dec;meta.main swaninteg ? Swan band strength if determined spect.line.intensity double nullable Teff ? The Cannon effective temperature Teff K phys.temperature.effective double nullable e_Teff ? rms uncertainty on Teff K stat.error;phys.temperature.effective double nullable logg ? The Cannon surface gravity logg log(cm.s**-2) phys.gravity double nullable e_logg ? rms uncertainty on logg log(cm.s**-2) stat.error double nullable [Fe/H] ? The Cannon iron abundance [Fe/H] phys.abund.Fe double nullable e_[Fe/H] ? rms uncertainty on [Fe/H] stat.error;phys.abund.Fe double nullable flagcannon ? The Cannon flags in a bit mask format (1) meta.code.error int nullable type [D/G-] G for giants and D for dwarfs meta.code char rvvar [FT] Is radial velocity variable (T=true) meta.code char cempcand [FT] Is star CEMP candidate (T=true) meta.code char Refs Bibcode(s) of the literature match meta.bib.bibcode char