Skip to main content

Web Publications


AAVSO: Electronic Journal of the AAVSO (eJAAVSO) AAVSO HOME > publications > ejaavso

 
 
eJAAVSO

Pulsating B Stars Discovered by HIPPARCOS

pdf    ps

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

 
 
  search engine |  site map |  links |  contact us








 

Keywords:
AAVSO 49 Bay State Rd. Cambridge, MA 02138 aavso@aavso.org 617-354-0484