Metal Abundances of one Hundred Hipparcos Dwarfs

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dc.creatorGratton, R. G.
dc.creatorCarretta, E.
dc.creatorClementini, G.
dc.creatorSneden, C.
dc.date1997-07-04
dc.date.accessioned2026-07-07T02:23:45Z
dc.date.available2026-07-07T02:23:45Z
dc.descriptionAbundances for Fe, O, and the alpha-elements (Mg, Si, Ca, and Ti) have been derived from high resolution spectra of a sample of about one hundred dwarfs with high precision parallaxes measured by HIPPARCOS. The stars have metal abundances in the range -2.5<[Fe/H]<0.2. The observational data set consists of high dispersion (20,000<R<70,000), high S/N (>200) spectra collected at the Asiago and McDonald Observatories. The abundance analysis followed the same precepts used by Gratton et al. (1997a) for ~300 field stars and for giants in 24 globular clusters Carretta and Gratton (1997), and includes corrections for departures from LTE in the formation of O lines. Our main results are: 1. the equilibrium of ionization of Fe is well satisfied in late F -- early K dwarfs 2. O and alpha-elements are overabundant by ~0.3dex This large homogeneous data set was used in the derivation of accurate ages for globular clusters.
dc.description4 Pages, 3 postscript figures, Latex using venice97.sty. To appear in Proceedings of the "Hipparcos Venice'97 Symposium", ESA SP-402. Text and figures also available via anonymous ftp at ftp://boas3.bo.astro.it/bap/files/bap97-16b-*.ps
dc.identifierhttps://arxiv.org/abs/astro-ph/9707060
dc.identifierhttp://arxiv.org/abs/astro-ph/9707060
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/11370
dc.subjectAstrophysics
dc.titleMetal Abundances of one Hundred Hipparcos Dwarfs
dc.typetext

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