Issue |
A&A
Volume 406, Number 1, July IV 2003
|
|
---|---|---|
Page(s) | 273 - 280 | |
Section | Stellar structure and evolution | |
DOI | https://doi.org/10.1051/0004-6361:20030746 | |
Published online | 17 November 2003 |
Surface imaging of stellar non-radial pulsations
I. Inversions of simulated data
1
Astronomy Division, University of Oulu, PO Box 3000, 90401 Oulu, Finland
2
Institute of Astronomy, ETHZ, 8092 Zurich, Switzerland
3
Nordic Optical Telescope, Apartado 474, 38700 S/C de La Palma, Canarias, Spain
4
Astrophysical Institute Potsdam, An der Sternwarte 16, 14482 Potsdam, Germany
Corresponding author: S. V. Berdyugina, sveta@astro.phys.ethz.ch
Received:
10
February
2003
Accepted:
13
May
2003
We investigate capability of the stellar surface imaging technique for
studying stellar non-radial pulsations on the basis of inversions of
time series of variable line profiles without making assumptions on
the specific shape of the pulsations. The inversion results in an
image of the stellar surface in which sectoral and tesseral modes can be
distinguished in many cases, and the pulsational degree and the
azimuthal order
can be determined.
We find that sectoral and tesseral modes with
(or any even number) can be successfully restored under various conditions
(different inclinations of the rotational axis, surface temperature or
velocity fluctuations due to pulsations). Tesseral modes with
(or any odd number) do not show significant line profile
variations at higher inclinations of the rotational axis, and, thus, no
information can be recovered from line profiles. At lower inclinations,
only the azimuthal order
of such modes can be recovered.
We conclude that stellar surface imaging is a useful technique
for pulsation-mode identification.
Key words: stars: imaging / stars: oscillations
© ESO, 2003
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