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Multiperiodic Variability and Outbursts of 28 Cygni

Published online by Cambridge University Press:  12 April 2016

S. Tubbesing ,
Th. Rivinius ,
B. Wolf  and
A. Kaufer
S. Tubbesing
Affiliation:
Landessternwarte Königstuhl, D-69117, Heidelberg, Germany
Th. Rivinius
Affiliation:
Landessternwarte Königstuhl, D-69117, Heidelberg, Germany
B. Wolf
Affiliation:
Landessternwarte Königstuhl, D-69117, Heidelberg, Germany
A. Kaufer
Affiliation:
European Southern Observatory, Santiago, Chile

Abstract

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28 Cygni was observed during two seasons spectroscopically. The radial velocities of more than 15 spectral lines were measured and searched for periodic variability. Two closely spaced periods were found. A two-dimensional analysis of the line profile variability yielded the same periods and provided the power and phase distribution across the line profiles. An outburst covered by our data coincides with the time of constructive interference of both periods. 28 Cyg is the second case for which outbursts seem to be triggered by multi-mode beating.

Type
3. Periodic Variations
Information
International Astronomical Union Colloquium , Volume 175: The Be Phenomenon in Early-Type Stars , 2000 , pp. 232 - 235
Copyright
Copyright © Astronomical Society of the Pacific 2000

References

Bossi, M., Guerrero, G., Zanin, F. 1993, A&A 269, 343 Google Scholar
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Rivinius, Th., Baade, D., Štefl, S, et al. 1998b, A&A 336, 177 Google Scholar