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Alpha-enhancement in the MW: results from the SDSS spectroscopic stellar database

Published online by Cambridge University Press:  01 December 2006

M. Franchini ,
C. Morossi ,
P. Di Marcantonio ,
M. L. Malagnini  and
M. Chávez
M. Franchini
Affiliation:
INAF – Osservatorio Astronomico di Trieste, Via G.B. Tiepolo, 11, I-34131 Trieste, Italy email: franchini@oats.inaf.it, morossi@oats.inaf.it, dimarcan@oats.inaf.it
C. Morossi
Affiliation:
INAF – Osservatorio Astronomico di Trieste, Via G.B. Tiepolo, 11, I-34131 Trieste, Italy email: franchini@oats.inaf.it, morossi@oats.inaf.it, dimarcan@oats.inaf.it
P. Di Marcantonio
Affiliation:
INAF – Osservatorio Astronomico di Trieste, Via G.B. Tiepolo, 11, I-34131 Trieste, Italy email: franchini@oats.inaf.it, morossi@oats.inaf.it, dimarcan@oats.inaf.it
M. L. Malagnini
Affiliation:
INAF – Osservatorio Astronomico di Trieste, Via G.B. Tiepolo, 11, I-34131 Trieste, Italy email: franchini@oats.inaf.it, morossi@oats.inaf.it, dimarcan@oats.inaf.it Dip. di Astronomia, Univ. degli Studi di Trieste, Via G.B. Tiepolo, 11, I-34131 Trieste, Italy email: malagnini@oats.inaf.it
M. Chávez
Affiliation:
Instituto Nacional de Astrofisica, Optica y Electronica, A.P. 51 y 216, 72000 Puebla, Mexico IAM-Univesidad de Guadalajara, Av. Vallarta 2602, C.P. 44130 Guadalajara, Mexico
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Abstract

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We analyzed a sample of about 2500 stars extracted from the Sloan Digital Sky Survey with Teffin the range 4750÷6500 K and log g greater than 1.5. Atmospheric parameter estimates are obtained by comparing observed and synthetic spectral indices. The dependence of the α-enhancement phenomenon on stellar metallicity and on Galactic position is investigated.

Keywords

Galaxy: stellar contentstars: abundancesstars: late-type
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 2 , Symposium S241: Stellar Populations as Building Blocks of Galaxies , December 2006 , pp. 245 - 247
Copyright
Copyright © International Astronomical Union 2007

References

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