A&A 390, 523-531 (2002)
DOI: 10.1051/0004-6361:20020565
A study of correlation between the oscillation amplitude
and stellar parameters of
Scuti stars in open clusters
Toward selection rules for
Scuti star oscillations
J.-C. Suárez1, E. Michel1, F. Pérez Hernández2, 3, Y. Lebreton4, Z. P. Li5 and L. Fox Machado2
1 LESIA, Observatoire de Paris-Meudon, FRE 2461, France
e-mail: Eric.Michel@obspm.fr
2 Instituto de Astrofísica de Canarias (IAC), 38200 La Laguna, Tenerife, Spain
e-mail: fph@ll.iac.es; lfox@ll.iac.es
3 Departamento de Astrofísica, Universidad de La Laguna, Tenerife, Spain
4 GEPI, Observatoire de Paris-Meudon, FRE 2459, France
e-mail: Yveline.Lebreton@obspm.fr
5 National Astronomical Observatories, Chinese Academy of Sciences, 100012 Beijing, PR China
e-mail: lizhi@bao.ac.cn
(Received 6 March 2002 / Accepted 3 April 2002 )
Abstract
In the present work, we study correlations between stellar
fundamental parameters and the oscillation amplitude for
Scuti stars. We
present this study for a sample of 17 selected
Scuti stars belonging to 5
young open clusters. Taking advantage of properties of
Scuti stars in
clusters, we correct the photometric parameters of our objects for
the effects of fast rotation. We confirm the benefit of applying
such corrections in this kind of studies. In addition, the
technique used for this correction allows us to obtain an
estimate of stellar parameters such as the angle of inclination and
the rotation rate, usually not accessible. A significant
correlation between the parameter
(estimation of the angle
of inclination of the star) and
the oscillation amplitude is found. A discussion and
interpretation of these a priori surprising results is proposed,
in terms of a possible selection rule for oscillation modes of
Scuti stars.
Key words: stars: variables:
Sct -- stars: rotation --
stars: statistics -- stars: oscillations -- stars: fundamental
parameters -- galaxies: star clusters
Offprint request: J.-C. Suárez, JuanCarlos.Suarez@obspm.fr
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