Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005a%26a...431..615a&link_type=abstract
Astronomy and Astrophysics, v.431, p.615-622 (2005)
Astronomy and Astrophysics
Astrophysics
13
Stars: Oscillations, Stars: Variables: General, Stars: Individual: Hd 121190, Stars: Individual: Hd 106419, Stars: Early-Type, Line: Profiles
Scientific paper
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 v sin i=118 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 v sin i=78 km s-1, which is also 26% of its critical velocity.
Based on data gathered with the Swiss 0.7 m telescope equipped with the photometer P7 of the Geneva Observatory and with the FEROS spectrograph attached to the ESO 2.2 m telescope, both situated at La Silla in Chile.
Aerts Christine
Kolenberg Katrien
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