Issue |
A&A
Volume 431, Number 2, February IV 2005
|
|
---|---|---|
Page(s) | 615 - 622 | |
Section | Stellar structure and evolution | |
DOI | https://doi.org/10.1051/0004-6361:20041325 | |
Published online | 04 February 2005 |
HD 121190: A cool multiperiodic slowly pulsating B star with moderate rotation*
1
Instituut voor Sterrenkunde, Katholieke Universiteit Leuven, Celestijnenlaan 200 B, 3001 Leuven, Belgium e-mail: conny@ster.kuleuven.ac.be
2
Department of Astrophysics, University of Nijmegen, PO Box 9010, 6500 GL Nijmegen, the Netherlands
3
Institut für Astronomie, Universität Wien, Türkenschanzstrasse 17, 1180 Wien, Austria
Received:
20
May
2004
Accepted:
20
October
2004
We have gathered and analysed multicolour Geneva photometry and
high-resolution spectroscopy of the stars HD 121190 (B9V) and HD 106419
(B9III) whose short-term periodic variability had become evident from their
HIPPARCOS data. We find three significant frequencies for HD 121190 in the
Geneva data: 2.6831, 2.6199 and 2.4713 c d-1 and classify the star as a
slowly pulsating B star, the coolest single star of that class known to
date. Its amplitude ratios are compatible with low-degree gravity modes. The
spectra reveal low-amplitude variability and km s-1
which implies that the star rotates at 26% of its critical velocity.
For HD 106419 we are unable to confirm the period found from the HIPPARCOS
photometry in our ground-based data; rather we find a marginally significant
frequency of 0.8986 c d-1. This star is probably an evolved slowly
pulsating B star with complex variations. HD 106409 is also a
moderate rotator as the spectra reveal
km s-1,
which is also 26% of its critical velocity.
Key words: stars: oscillations / stars: variables: general / stars: individual: HD 121190 / stars: individual: HD 106419 / stars: early-type / line: profiles
© ESO, 2005
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