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Selection of a sample of bright southern Slowly Pulsating B Stars for long-term photometric and spectroscopic monitoring
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| Abstract |
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| 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 B2 up to B9 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. |
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| Language |
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English
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| Source (journal) |
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Astronomy and astrophysics. - Berlin, 1969, currens | |
| Publication |
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Berlin : Springer, 1999
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| ISSN |
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0004-6361 [print]
1432-0746 [online]
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| Volume/pages |
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343:3(1999), p. 872-882
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000079495100028
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| Full text (open access) |
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