Astron. Astrophys. 346, 586-598 (1999)

Photometric parameters for rotating models of A- and F-type stars

F. Pérez Hernández ¹, A. Claret ², M.M. Hernández ¹ and E. Michel <sup>3

1</sup> Instituto de Astrofísica de Canarias, E-38200 La Laguna, Tenerife, Spain
² Instituto de Astrofísica de Andalucía, E-18080 Granada, Spain
³ DASGAL, URA CNRS 335, Observatoire de Paris, F-92195 Meudon, France

Received 19 November 1998 / Accepted 26 March 1999

Abstract

We have computed the photometric magnitudes of rotating atmospheres-based on the simple model of Collins-for a grid suitable for main-sequence and slightly evolved stars of spectral type A0 to F5. A gravity-darkening law valid for radiative and convective envelopes has been considered. The general results are given as magnitude differences between rotating and non-rotating copartners to allow for the use of any photometric calibration. A simple interpolation on these results gives the photometric parameters for interior rotating models but we also indicate how they can be used to correct for the effect of rotation when an investigation with non-rotating models is carried out. We illustrate the procedure with the interesting case of the Praesepe Cluster.

Key words: stars: rotation stars: fundamental parameters stars: variables: ffi Sct Galaxy: open clusters and associations: individual: Praesepe

Send offprint requests to: F. Pérez Hernández (fph@ll.iac.es)

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Contents

• 1. Introduction
• 2. Photometric magnitudes for rotating models
  • 2.1. Basic assumptions and equations
  • 2.2. Differential photometric magnitudes
  • 2.3. Effect due to changes in the interior structure
• 3. Non-rotating photometric counterparts for stars in a cluster
  • 3.1. Isochrones for the Praesepe Cluster
  • 3.2. Non-rotating associate models for the Scuti stars in the Praesepe Cluster
• 4. Conclusions
• Acknowledgements
• References

© European Southern Observatory (ESO) 1999

Online publication: May 21, 1999
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