EDP Sciences
Free Access
Volume 438, Number 2, August I 2005
Page(s) 633 - 641
Section Stellar structure and evolution
DOI https://doi.org/10.1051/0004-6361:20042410

A&A 438, 633-641 (2005)
DOI: 10.1051/0004-6361:20042410

Modelling of the fast rotating $\delta$ Scuti star Altair

J. C. Suárez1, H. Bruntt2, 3 and D. Buzasi2

1  Instituto de Astrofísica de Andalucía (CSIC), Granada, Spain
    e-mail: jcsuarez@iaa.es
2  Department of Physics, US Air Force Academy, 2354 Fairchild Dr., Ste. 2A31, USAF Academy, CO, USA
    e-mail: derek.buzasi@usafa.af.mil
3  Copenhagen University, Astronomical Observatory, Juliane Maries Vej 30, 2100 Copenhagen Ø, Denmark
    e-mail: bruntt@phys.au.dk

(Received 22 November 2004 / Accepted 15 March 2005)

We present an asteroseismic study of the fast rotating star HD 187642 ( Altair ), recently discovered to be a $\delta$ Scuti pulsator. We have computed models taking into account rotation for increasing rotational velocities. We investigate the relation between the fundamental radial mode and the first overtone in the framework of Petersen diagrams. The effects of rotation on such diagrams, which become important at rotational velocities above $150~\rm {km}\,\rm {s}^{-1}$, as well as the domain of validity of our seismic tools are discussed. We also investigate the radial and non-radial modes in order to constrain models fitting the five most dominant observed oscillation modes.

Key words: stars: variables: $\delta$ Sct -- stars: rotation -- stars: oscillations -- stars: fundamental parameters -- stars: interiors -- stars: individual: Altair

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