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Microturbulent velocities and abundances for A and F dwarfs in open clusters

Published online by Cambridge University Press:  01 August 2006

M. Gebran  and
R. Monier
M. Gebran
Affiliation:
GRAAL, Université de Montpellier II, Place Eugène Bataillon, 34095, Montpellier email: [email protected] email: [email protected]
R. Monier
Affiliation:
GRAAL, Université de Montpellier II, Place Eugène Bataillon, 34095, Montpellier email: [email protected] email: [email protected]
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Abstract

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The current status of microturbulent velocity and abundance determinations for A and F dwarfs in open clusters is reviewed. A programme to observe several tens of A and F dwarfs in open clusters of various ages was initiated several years ago. We have performed high resolution high signal-to-noise spectroscopy of stars well distributed in mass along the Main Sequence. Microturbulent velocities and abundances of several chemical elements have been derived iteratively by fitting grids of synthetic spectra calculated in LTE to the observed spectra. Curve of growths were used in a few instances as well. The results obtained are reviewed for Coma Berenices, the Pleiades, Alpha Persei and the Ursa Major moving group.

The microturbulent velocities exhibit a broad maximum in the range A5V to about F0V as indicated in Smalley (2004).

Keywords

Turbulencestars: abundances(Galaxy:) open clusters and associations: general
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 2 , Symposium S239: Convection in Astrophysics , August 2006 , pp. 160 - 162
Copyright
Copyright © International Astronomical Union 2007

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