J/ApJ/773/33ivo://CDS.VizieR/J/ApJ/773/33doi:10.26093/cds/vizier.17730033CDSIto H.Aoki W.Beers T.C.Tominaga N.Honda S.Carollo D.2015-04-14T09:57:58Z2015-03-16T12:13:50ZCDS support team

CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France

cds-question@unistra.frchemically-peculiar-starscarbon-starschemical-abundancesline-intensitiesWe present detailed chemical abundances for the bright carbon-enhanced metal-poor (CEMP) star BD+44{deg}493, previously reported on by Ito et al. (2009ApJ...698L..37I). Our measurements confirm that BD+44{deg}493 is an extremely metal-poor ([Fe/H]=-3.8) subgiant star with excesses of carbon and oxygen. No significant excesses are found for nitrogen and neutron-capture elements (the latter of which place it in the CEMP-no class of stars). Other elements that we measure exhibit abundance patterns that are typical for non-CEMP extremely metal-poor stars. No evidence for variations of radial velocity has been found for this star. These results strongly suggest that the carbon enhancement in BD+44{deg}493 is unlikely to have been produced by a companion asymptotic giant-branch star and transferred to the presently observed star, nor by pollution of its natal molecular cloud by rapidly-rotating, massive, mega metal-poor ([Fe/H]<-6.0) stars. A more likely possibility is that this star formed from gas polluted by the elements produced in a "faint" supernova, which underwent mixing and fallback, and only ejected small amounts of elements of metals beyond the lighter elements. The Li abundance of BD+44{deg}493 (A(Li)=log(Li/H)+12=1.0) is lower than the Spite plateau value, as found in other metal-poor subgiants. The upper limit on Be abundance (A(Be)=log(Be/H)+12<-1.8) is as low as those found for stars with similarly extremely-low metallicity, indicating that the progenitors of carbon- (and oxygen-) enhanced stars are not significant sources of Be, or that Be is depleted in metal-poor subgiants with effective temperatures of ~5400K.2013ApJ...773...33Ihttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/773/33CatalogResearchIsServedByTAP VizieR generic servicerelated-toI/311 : Hipparcos, the New Reduction (van Leeuwen, 2007)VII/233 : The 2MASS Extended sources (IPAC/UMass, 2003-2006)I/259 : The Tycho-2 Catalogue (Hog+ 2000)II/215 : uvby-beta Catalogue (Hauck+ 1997)J/AJ/147/136 : Stars of very low metal abundance. VI. (Roederer+, 2014)J/ApJ/762/26 : Most metal-poor stars. II. Galactic halo stars (Yong+, 2013)J/AJ/145/13 : Metal-poor stars from SDSS/SEGUE. I. Abundances (Aoki+, 2013)J/MNRAS/412/843 : SAGA extremely metal-poor stars (Suda+, 2011)J/A+A/512/A54 : Teff and Fbol from Infrared Flux Method (Casagrande+, 2010)J/A+A/503/541 : Li in late-type stars non-LTE calculations (Lind+, 2009)J/A+A/501/519 : Extremely metal-poor stars abundances (Bonifacio+, 2009)J/AJ/137/4377 : List of SEGUE plate pairs (Yanny+, 2009)J/A+A/497/497 : Physical parameters from JHK flux (Gonzalez-Hernandez+, 2009)J/ApJ/704/750 : Rotational behavior of metal-poor stars (Cortes+, 2009)J/ApJ/681/1524 : Detailed abundances for 28 metal-poor stars (Lai+, 2008)J/ApJ/658/367 : Abundances of carbon stars in Galactic halo (Komiya+, 2007)J/AJ/132/137 : Abundances of EMP carbon stars (Cohen+, 2006)J/A+A/416/1117 : Abundances in the early Galaxy (Cayrel+, 2004)J/AJ/107/1577 : Halo red giants reddening (Anthony-Twarog+, 1994)J/AJ/87/1165 : Reddening Maps derived from HI & Galaxy Cts (Burstein+ 1982)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/773/33https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/773/33http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/773/33https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/773/33https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/773/33http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/773/33GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticaldefaultJ/ApJ/773/33/table2Line data and equivalent widthsIonSpecies identifierphys.atmol.ionStagecharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintlambda[3118/7772] Wavelength0.1nmem.wldoublelog(gf)[-9.9/0.6] Log of the oscillator strengthphys.atmol.oscStrengthfloatLEP[0/9.2] Lower excitation potentialeVphys.atmol.excitation;stat.minfloatl_EWLimit flag on EW (1)meta.code.error;spect.line.eqWidthcharEW[0.2/125.3] Equivalent width; milli-Angstroms1e-13mspect.line.eqWidthfloatNoteAdditional remarks (1)meta.notechar