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Title:
Synthetic Lick Indices and Detection of α-enhanced Stars. II. F, G, and K Stars in the -1.0 < [Fe/H] < +0.50 Range
Authors:
Franchini, M.; Morossi, C.; Di Marcantonio, P.; Malagnini, M. L.; Chavez, M.; Rodríguez-Merino, L.
Affiliation:
AA(INAF-Osservatorio Astronomico di Trieste, Via G.B. Tiepolo, 11, I-34131 Trieste, Italy ), AB(INAF-Osservatorio Astronomico di Trieste, Via G.B. Tiepolo, 11, I-34131 Trieste, Italy ), AC(INAF-Osservatorio Astronomico di Trieste, Via G.B. Tiepolo, 11, I-34131 Trieste, Italy ), AD(Dipartimento di Astronomia, Università degli Studi di Trieste, Via G.B. Tiepolo, 11, I-34131 Trieste, Italy ), AE(Instituto Nacional de Astrofísica, Optica y Electrónica, A.P. 51 y 216, 72000 Puebla, Mexico ), AF(Instituto Nacional de Astrofísica, Optica y Electrónica, A.P. 51 y 216, 72000 Puebla, Mexico )
Publication:
The Astrophysical Journal, Volume 613, Issue 1, pp. 312-321. (ApJ Homepage)
Publication Date:
09/2004
Origin:
UCP
Astronomy Keywords:
Galaxy: Stellar Content, Stars: Abundances, Stars: Kinematics, Stars: Late-Type
DOI:
10.1086/422909
Bibliographic Code:
2004ApJ...613..312F

Abstract

We present an analysis of 402 F, G, and K solar neighborhood stars, with accurate estimates of [Fe/H] in the range -1.0 to +0.5 dex, aimed at the detection of α-enhanced stars and at the investigation of their kinematical properties. The analysis is based on the comparison of 571 sets of spectral indices in the Lick/IDS system, coming from four different observational data sets, with synthetic indices computed with solar-scaled abundances and with α-element enhancement. We use selected combinations of indices to single out α-enhanced stars without requiring previous knowledge of their main atmospheric parameters. By applying this approach to the total data set, we obtain a list of 60 bona fide α-enhanced stars and of 146 stars with solar-scaled abundances. The properties of the detected α-enhanced and solar-scaled abundance stars with respect to their [Fe/H] values and kinematics are presented. A clear kinematic distinction between solar-scaled and α-enhanced stars was found, although a one-to-one correspondence to ``thin disk'' and ``thick disk'' components cannot be supported with the present data.

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