Journal Article

Metallicity and photospheric abundances in field GKM giants and dwarfs*

M. Zboril

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 397, issue 1, pages 335-340
Published in print July 2009 | ISSN: 0035-8711
Published online July 2009 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2009.14917.x
Metallicity and photospheric abundances in field GKM giants and dwarfs*

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This paper deals with standard elemental abundances in late-type stars. By analysing high signal-to-noise ratio and high-resolution data we have found that dwarf stars have generally solar and below-solar abundances, and that all giants in our sample are indicated to be overabundant at the present stage of the study. The dwarf stars match the evolutionary diagram for the age interval ∼0.3–10 Gyr. The star EQ Vir from the sample is found to have several signatures of activity: namely, a higher value of v sin i (12 km s−1), and emission in spectral lines such as Hα and Ca ii. Furthermore, its pronounced TiO 7055-Å band head indicates a slight inconsistency with its spectral type. The TiO band head signature has been estimated in the coolest stars in the sample. Also the measured radial velocities indicate possible binarity for some of the stars in the sample. Importantly, emergent radiation from stars is a present topic for debate with respect to the habitable zones of planetary systems.

Keywords: stars: abundances; stars: activity; stars: individual: EQ Vir; stars: late-type

Journal Article.  3833 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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