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| Paper: |
Pulsating B Stars Discovered by HIPPARCOS |
| Volume: |
135, A Half Century of Stellar Pulsation Interpretations: a Tribute to Arthur N. Cox |
| Page: |
375 |
| Authors: |
Waelkens, C.; Aerts, C.; Grenon, N. I.; Eyer, L. |
| Abstract: |
The photometric experiment on board Hipparcos has discovered an impressive amount of new variable stars, among them many early-type ones. The sample is important because it is fairly free from observational bias with respect to time scales and variability type. In fact, it reflects the bias of earlier studies in negative: not so many new Beta Cephei stars were found, but quite some periodic supergiants and some periodic stars of unknown class. With this sample, the number of SPB candidates increases by a factor of 10! We report on the overall properties of the sample and on follow-up observations. The SPB candidates do display the expected line-profile variations, which will be interpreted in terms of mode identification. The study of the sample will enable a better observational description of the instability strip where SPBs occur. A remarkable result is that another selection effect emerges: SPBs detected from the ground all are small rotators, but in the Hipparcos sample several stars with intermediate rotation velocities occur. |
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