Volume 431, Number 2, February IV 2005
|Page(s)||615 - 622|
|Section||Stellar structure and evolution|
|Published online||04 February 2005|
HD 121190: A cool multiperiodic slowly pulsating B star with moderate rotation*
Instituut voor Sterrenkunde, Katholieke Universiteit Leuven, Celestijnenlaan 200 B, 3001 Leuven, Belgium e-mail: firstname.lastname@example.org
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
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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