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Title
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HD 121190 : a cool multiperiodic slowly pulsating B star with moderate rotation
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Author
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Abstract
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| We have gathered and analysed multicolour Geneva photometry and high-resolution spectroscopy of the stars HD121190 (B9V) and HD106419 (B9III) whose short-term periodic variability had become evident from their HIPPARCOS data. We find three significant frequencies for HD121190 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 v sin i = 118 km s(-1) which implies that the star rotates at 26% of its critical velocity. For HD106419 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. HD106409 is also a moderate rotator as the spectra reveal v sin i = 78 km s(-1), which is also 26% of its critical velocity. |
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Language
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English
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Source (journal)
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Astronomy and astrophysics. - Berlin, 1969, currens
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Publication
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Berlin
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Springer
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2005
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ISSN
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0004-6361
[print]
1432-0746
[online]
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Volume/pages
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431
:2
(2005)
, p. 615-622
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ISI
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000226795800023
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Full text (Publisher's DOI)
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Full text (open access)
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