Issue |
A&A
Volume 366, Number 2, February I 2001
|
|
---|---|---|
Page(s) | 547 - 557 | |
Section | Interstellar and circumstellar matter | |
DOI | https://doi.org/10.1051/0004-6361:20000196 | |
Published online | 15 February 2001 |
Simultaneous intensive photometry and high resolution spectroscopy of δ Scuti stars*
V. The high-degree modes in the pulsational content of BV Circini
Osservatorio Astronomico di Brera, Via E. Bianchi 46, 23807 Merate, Italy
Corresponding author: E. Poretti, poretti@merate.mi.astro.it
Received:
6
September
2000
Accepted:
3
November
2000
We discuss here the pulsation properties of the δ Scuti star BV Circini
on the basis of data obtained during a simultaneous photometric and spectroscopic
campaign in 1996 and a spectroscopic one in 1998, and taking also advantage
of the previous photometric observations by Kurtz ([CITE]).
Nine pulsation modes were detected from photometry and
thirteen from spectroscopy; five of them are in common to both techniques.
The spectroscopic data give ample evidence of dramatic amplitude
variations in some modes, in particular the strongest spectroscopic mode in
1998 was not detectable in 1996 data. The two dominant photometric modes
(6.33 and 7.89 cd-1) are observed on both seasons.
The typing of the modes was performed by means of a simultaneous model
fit of line profile and light variations. The 6.33 cd-1 photometric term
is probably the fundamental radial mode, while the 7.89 cd-1 is a
nonradial mode with .
There are six
high-degree prograde modes with an azimuthal order m ranging from -12 to -14,
and also a retrograde mode with
. These modes combined with the
identification of the 6.33 cd-1 mode allowed us to estimate
for the value of
the inclination of the rotation axis. An accurate evaluation of the main
stellar physical parameters is also proposed as a result of the pulsational analysis.
Key words: methods: data analysis / techniques: spectroscopic / techniques: photometric / stars: individual: BV Cir / stars: oscillations / stars: variables: δ Sct
© ESO, 2001
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