| Issue |
A&A
Volume 483, Number 3, June I 2008
|
|
|---|---|---|
| Page(s) | 891 - 902 | |
| Section | Stellar atmospheres | |
| DOI | https://doi.org/10.1051/0004-6361:200809467 | |
| Published online | 01 April 2008 | |
The effect of rotation on the abundances of the chemical elements of the A-type stars in the Praesepe cluster *,**
1
Institut für Astronomie, Universität Wien, Türkenschanzstrasse 17, 1180 Wien, Austria e-mail: [fossati;weiss]@astro.univie.ac.at
2
Armagh Observatory, College Hill, Armagh BT61 9DG, Northern Ireland e-mail: sba@arm.ac.uk
3
Department of Physics & Astronomy, University of Western Ontario, London, N6A 3K7, Ontario, Canada e-mail: jlandstr@astro.uwo.ca
4
Physics Dept., Royal Military College of Canada, PO Box 17000, Station Forces, K7K 4B4, Kingston, Canada e-mail: Gregg.Wade@rmc.ca
5
Department of Physics and Astronomy, Uppsala University, 751 20, Uppsala, Sweden e-mail: oleg@astro.uu.se
6
Laboratoire Universitaire d'Astrophysique de Nice, Universite de Nice Sophia-Antipolis, Parc Valrose, 06000 Nice, France e-mail: Richard.MONIER@unice.fr
7
Groupe de Recherche en Astronomie et Astrophysique du Languedoc, UMR 5024, Université Montpellier II, Place Eugène Bataillon, 34095 Montpellier, France e-mail: Marwan.Gebran@graal.univ-montp2.fr
Received:
28
January
2008
Accepted:
21
March
2008
Aims. We study how chemical abundances of late B-, A-, and early F-type stars
evolve with time, and we search for correlations between the abundance of
chemical elements and other stellar parameters, such as effective temperature
and 
.
Methods. We observed a large number of B-, A-, and F-type stars belonging to
open clusters of different ages. In this paper we concentrate on the Praesepe
cluster (
= 8.85), for which we have obtained high-resolution, high
signal-to-noise ratio spectra of sixteen normal A- and F-type stars and
one Am star, using the SOPHIE spectrograph of the Observatoire de
Haute-Provence. For all the observed stars, we derived fundamental
parameters and chemical abundances. In addition, we discuss another
eight Am stars belonging to the same cluster, for which the abundance analysis
had been presented in a previous paper.
Results. We find a strong correlation between the peculiarity of Am stars and .
The abundance of the elements underabundant in Am stars increases with ,
while it decreases for the overabundant elements. Chemical abundances of
various elements appear correlated with the iron abundance.
Key words: stars: abundances / stars: atmospheres / stars: fundamental parameters / stars: chemically peculiar
© ESO, 2008
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