Selection of a sample of bright southern Slowly Pulsating B Stars for long-term photometric and spectroscopic monitoring
- Autor(en)
- Conny Aerts, Peter De Cat, E Peeters, Leen Decin, Joris De Ridder, Katrien Kolenberg, G Meeus, H Van Winckel, J Cuypers, Christoffel Waelkens
- Abstrakt
The photometric experiment on Hipparcos has led to the discovery of, among other types of variables, a large amount of new Slowly Pulsating B Stars. We have selected twelve bright southern stars of this sample, together with five previously known Slowly Pulsating B Stars, for spectroscopic and photometric monitoring. These seventeen stars have spectral types ranging from B 2 up to B 9 and thus fully cover the instability strip. We here present the results of a preliminary analysis of our data and show that our sample is an extremely important one to perform seismology of intermediate-massive stars. In particular, we find that all but one of the selected stars exhibit clear line-profile variability. The broader-lined Slowly Pulsating B Stars tend to have more complex line-profile variations. One of the previously known Slowly Pulsating B stars was known to be a binary. Besides this star, another six of the selected Slowly Pulsating B stars turn out to be multiple systems. Five of these seven binaries have large rotational velocities and complicated line-profile variations with moving subfeatures. It is not yet clear whether or not the binarity results in a particular spectrum of excited modes.
- Organisation(en)
- Institut für Astrophysik
- Externe Organisation(en)
- Katholieke Universiteit Leuven, Leibniz-Institut für Astrophysik Potsdam, Royal Observatory of Belgium
- Journal
- Astronomy & Astrophysics
- Band
- 343
- Seiten
- 872-882
- Anzahl der Seiten
- 11
- ISSN
- 0004-6361
- Publikationsdatum
- 1999
- Peer-reviewed
- Ja
- ÖFOS 2012
- 103003 Astronomie
- Link zum Portal
- https://ucrisportal.univie.ac.at/de/publications/selection-of-a-sample-of-bright-southern-slowly-pulsating-b-stars-for-longterm-photometric-and-spectroscopic-monitoring(6d3c76ee-c36c-48f2-872a-0979e4221e68).html