Pulsating B Stars Discovered by HIPPARCOS
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C. Aerts
Postdoctoral Fellow, Fund for Scientific Research, Flanders, Belgium
Instituut voor Sterrenkunde, Katholieke Universiteit Leuven, Celestijnenlaan 200,
B, B-3001 Leuven, Belgium
C. Waelkens
P. De cat
K. Kolenberg
E. Kestens
Instituut voor Sterrenkunde, Katholieke Universiteit Leuven, Celestijnenlaan 200,
B, B-3001 Leuven, Belgium
M. Grenon
L. Eyer
Observatoire de Geneve, CH-1290 Sauverny, Switzerland
The follow-up data were performed with the Swiss Telescope of the Geneva Observatory
and with ESO's CAT telescope, both at La Silla, Chile
Abstract
We present a classification of 267 new variable B-type stars discovered
by HIPPARCOS, which results in, among others, a huge number of new slowly
Pulsating B stars and several supergiants with α Cyg-type variations. Our results clearly point out the bias towards short-period variables of earlier, ground-based
surveys of variable stars.
The position of the new Β Cephei stars and Slowly Pulsating B stars in the HR
diagram is compared with the most recent calculations of the instability strips. The
new Slowly Pulsating B stars almost fully cover the theoretical instability domain.
The supergiants with α Cyg-type variations are situated between the α Cephei stars
and the Slowly Pulsating B star, on the one hand, and previously known supergiants
that exhibit micro-variations on the other hand.
Finally, we introduce the follow-up study of the most interesting targets that
we started in 1996 and that is still ongoing.
Link to article on ADS
