Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994a%26a...288..155n&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 288, no. 1, p. 155-164
Astronomy and Astrophysics
Astrophysics
22
B Stars, Peculiar Stars, Stellar Oscillations, Stellar Rotation, Stellar Spectra, Angular Velocity, Light Curve, Line Spectra, Magnesium, Spectrum Analysis, Stellar Magnitude, Stellar Spectrophotometry, Stellar Temperature
Scientific paper
We report the discovery of non-radial pusations with at least 5 periods in the B8V star HD 37151, a probable member of the Orion OB1 association. This result is based on 465 photometric measurements in 7 colors spanning 12 years. In addition, 30 high-resolution spectra were taken in the Mg II lambda 4481 region: they show a small projected rotational velocity and slight variations of the line profiles where at least two out of the five photometric periods can be identified. Although this star was once classified B8Vp(Si), all available data show it is a normal star instead. Therefore, this object in not another example (after ET And) of a pulsating silicon star, but entirely matches the characteristics of Waelkens' 'Slowly Pulsating B stars' (SPB). It offers the interest of being the second coolest member of this class, helping to define empirically the cool border of the related instability domain. The ratio of color to visual amplitudes A(sub(u-v)/Av of the known SPB stars is nicely correlated with Teff, in good agreement with theoretical expectations for non-radial pulsations with order less than or = 2.
North Pierre
Paltani Stephane
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