Astrophys. J., 634, 1319-1335 (2005/December-1)
Synthetic Lick indices and detection of α-enhanced stars. III. F, G, and K stars with [Fe/H]>0.00.
FRANCHINI M., MOROSSI C., DI MARCANTONIO P., CASTELLI F., MALAGNINI M.L. and CHAVEZ M.
Abstract (from CDS):
A sample of 119 F, G, and K solar neighborhood stars, selected under the condition [Fe/H]>0.00, is investigated in order to detect which of them, if any, present α-enhanced characteristics. According to the kinematics, the sample represents stars of the thin-disk component of the Galaxy. The search of α-enhanced characteristics is performed by adopting an already tested procedure that does not require previous knowledge of the stellar main atmospheric parameters. The analysis is based on the comparison of spectral indices in the Lick IDS system, coming from different observational data sets, with synthetic ones computed with solar-scaled abundances and with α-element enhancement. The main result of the analysis is the extreme paucity (likely just one in 119) of α-enhanced stars in our sample, thus suggesting [α/Fe]=0.0 for thin-disk stars with [Fe/H]>0.00. This result, which is in agreement with the standard evolutionary picture of the disk of the Galaxy, is compared with recent results from high-resolution analysis reported in the literature. The role of the atmospheric parameter assumptions in the analysis of high-resolution spectroscopic data is discussed, and a possible explanation of discrepant results about α-enhancement for stars with [Fe/H]>0.00 is presented.
Galaxy: Stellar Content - Stars: Abundances - Stars: Kinematics - Stars: Late-Type
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<Available at CDS (J/ApJ/634/1319): table2.dat table4.dat>
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