Astronomy and Astrophysics – Astrophysics
Scientific paper
2007-05-24
Mon.Not.Roy.Astron.Soc.379:201-208,2007
Astronomy and Astrophysics
Astrophysics
8 pages, 4 figures, 3 tables. (MNRAS, in press)
Scientific paper
10.1111/j.1365-2966.2007.11927.x
A comparison between linear stability analysis and observations of pulsation modes in five delta Scuti stars, belonging to the same cluster, is presented. The study is based on the work by Michel et al. (1999), in which such a comparison was performed for a representative set of model solutions obtained independently for each individual star considered. In this paper we revisit the work by Michel et al. (1999) following, however, a new approach which consists in the search for a single, complete, and coherent solution for all the selected stars, in order to constrain and test the assumed physics describing these objects. To do so, refined descriptions for the effects of rotation on the determination of the global stellar parameters and on the adiabatic oscillation frequency computations are used. In addition, a crude attempt is made to study the role of rotation on the prediction of mode instabilities.The present results are found to be comparable with those reported by Michel et al. (1999). Within the temperature range log T_eff = 3.87-3.88 agreement between observations and model computations of unstable modes is restricted to values for the mixing-length parameter alpha_nl less or equal to 1.50. This indicates that for these stars a smaller value for alpha_nl is required than suggested from a calibrated solar model. We stress the point that the linear stability analysis used in this work still assumes stellar models without rotation and that further developments are required for a proper description of the interaction between rotation and pulsation dynamics.
Hernandez Perez F.
Houdek Guenter
Lebreton Yveline
Michel Eberhard
Suarez Juan Carlos
No associations
LandOfFree
Mode stability in delta Scuti stars: linear analysis versus observations in open clusters does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Mode stability in delta Scuti stars: linear analysis versus observations in open clusters, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Mode stability in delta Scuti stars: linear analysis versus observations in open clusters will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-606441