Supersolar metallicity in Go-G3 main-sequence stars with V < 15

The basic stellar atmospheric parameters (effective temperature, surface gravity and global metallicity) were determined simultaneously for a sample of 233 stars, limited in magnitude (V < 15), with spectral types between G0 and G3 and luminosity class V (main sequence). The analysis was based on...

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Bibliographic Details
Published in:Monthly notices of the Royal Astronomical Society 2014-11, Vol.444 (3), p.2251-2251
Main Authors: Lopez-Valdivia, R, Bertone, E, Chavez, M, Tapia-Schiavon, C, Hernandez-Aguila, J B, Valdes, J R, Chavushyan, V
Format: Article
Language:English
Subjects:
Asteroids
Astrophysics
Atmospherics
Ceres asteroid
Gravity
Luminosity
Metallicity
Spectra
Spectrum analysis
Star & galaxy formation
Stars
Temperature effects
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Summary:The basic stellar atmospheric parameters (effective temperature, surface gravity and global metallicity) were determined simultaneously for a sample of 233 stars, limited in magnitude (V < 15), with spectral types between G0 and G3 and luminosity class V (main sequence). The analysis was based on spectroscopic observations collected at the Observatorio Astrofisico Guillermo Haro and using a set of Lick-like indices defined in the spectral range 3800-4800 A. An extensive set of indices computed in a grid of theoretical spectra was used as a comparison tool in order to determine the photospheric parameters. The method was validated by matching the results from spectra of the asteroids Vesta and Ceres with the Sun parameters. The main results were as follows: (i) the photospheric parameters were determined for the first time for 213 objects in our sample and (ii) a sample of 20 new super-metal-rich star candidates was found.
ISSN:0035-8711
1365-2966