Modelling of the fast rotating δ Scuti star Altair
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 δ 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 
,
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: δ Sct / stars: rotation / stars: oscillations / stars: fundamental parameters / stars: interiors / stars: individual: Altair
© ESO, 2005