{alpha}-element abundances of Cepheid stars


We present new homogeneous measurements of Na, Al, and three alpha-elements (Mg, Si, Ca) for 75 Galactic Cepheids, complemented with Cepheid abundances available in the literature, for a total of 439 stars. The abundances are based on high spectral resolution (R~38000) and high signal-to-noise ratio (S/N~50-300) spectra collected with UVES at ESO VLT. Special attention was given to providing a homogeneous abundance scale for these five elements plus iron. In addition, accurate Galactocentric distances (RG) based on near-infrared photometry are also available for all the Cepheids in the sample. We found that these five elements display well-defined linear radial gradients and modest standard deviations over the entire range of RG. The [element/Fe] abundance ratios are constant across the entire thin disk and over the entire period range; only the Ca radial distribution shows marginal evidence of slopes. These results indicate that the chemical enrichment history of iron and of the quoted elements has been quite similar across the four quadrants of the Galactic thin disk, and very homogenous within the range in age covered by the Cepheids (~10-300Myr). Finally, we also find that Cepheid abundances agree with similar abundances for thin and thick disk dwarf stars, and they follow the typical Mg-Al and Na-O correlations.

Cone search capability for table J/A+A/580/A17/table2 (Mean abundances of Fe, Na, Al, Mg, Si, and Ca for the 75 Cepheids)

Cone search capability for table J/A+A/580/A17/table5 (Na, Al, Mg, Si, and Ca abundances for the whole sample of 439 Galactic Cepheids (the current 75 plus 364 from the literature))

DOI http://doi.org/10.26093/cds/vizier.35800017
Source https://dc.g-vo.org/rr/q/lp/custom/CDS.VizieR/J/A+A/580/A17
Related Identifier https://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/580/A17
Related Identifier http://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/580/A17
Metadata Access http://dc.g-vo.org/rr/q/pmh/pubreg.xml?verb=GetRecord&metadataPrefix=oai_b2find&identifier=ivo://CDS.VizieR/J/A+A/580/A17
Creator Genovali K.; Lemasle B.; da Silva R.; Bono G.; Fabrizio M.; Bergemann M.; Buonanno R.; Ferraro I.; Francois P.; Iannicola G.; Inno L.; Laney C.D.; Kudritzki R.-P.; Matsunaga N.; Nonino M.; Primas F.; Romaniello M.; Urbaneja M.A.; Thevenin F.
Publisher CDS
Publication Year 2015
Rights https://cds.unistra.fr/vizier-org/licences_vizier.html
OpenAccess true
Contact CDS support team <cds-question(at)unistra.fr>
Resource Type Dataset
Discipline Astrophysics and Astronomy; Galactic and extragalactic Astronomy; Interdisciplinary Astronomy; Natural Sciences; Observational Astronomy; Physics; Stellar Astronomy