Hostname: page-component-76fb5796d-r6qrq Total loading time: 0 Render date: 2024-04-26T02:32:53.661Z Has data issue: false hasContentIssue false
  • English
  • Français

The Onset of Quasi-Periodic Variations in Be Stars

Published online by Cambridge University Press:  12 April 2016

T. Kogure ,
M. Mon  and
M. Suzuki
T. Kogure
Affiliation:
Department of Astronomy, Faculty of Science, Kyoto University, Sakyo-ku, Kyoto 601-01, Japan
M. Mon
Affiliation:
Department of Astronomy, Faculty of Science, Kyoto University, Sakyo-ku, Kyoto 601-01, Japan
M. Suzuki
Affiliation:
Kanazawa Institute of Technology, Kanazawa 921, Japan

Extract

Core share and HTML view are not available for this content. However, as you have access to this content, a full PDF is available via the ‘Save PDF’ action button.

We present some evidence of the quasi-periodic long-term variations (QPLV) in the violet-to-red ratio of double-peaked emission lines (V/R variation) and/or in the radial velocities of shell absorption lines for some Be stars. Although the V/R variations are rather prevailing phenomena among Be stars, the QPLV is remarkable by the following characteristics:

  1. (1) The QPLV appears as a sudden onset of repeated V/R variations after a long (10 years), almost stable period, and it persists for a few or several periods in ten or more years.

  2. (2) The period and amplitude of V/R variations change from cycle to cycle and from star to star. The variations of radial velocities (RV) of shell absorption lines are usually nearly parallel with the V/R variations.

  3. (3) The QPLV appears usually in early type Be stars with large rotational velocities, regardless whether the stars are normal Be or shell stars, and whether they are close-binaries or single stars.

Type
II. Observational Facts
Information
International Astronomical Union Colloquium , Volume 134: Nonlinear Phenomena in Stellar Variability , 1993 , pp. 223 - 225
Copyright
Copyright © Kluwer 1993

References

References:

1. Kogure, Horaguchi, , Hirata, , Kawai, , Matsuoka, , Murakami, , Doazan, , Slettebak, , Huang, C.C., Cao, , Guo, L. Huang, , Tsujita, , Ohshima, , & Ito (in preparation).Google Scholar
2. McLaughlin, : 1963, ApJ, 137, 1085.Google Scholar
3. Mon, , Kogure, , Suzuki, , & Singh, ,: 1992 PASJ, 44 (in press).Google Scholar
4. Cowley, & Gugula, ,: 1973, A&A,, 22, 203.Google Scholar
5. Merrill, & Sanford, ,: 1944, ApJ, 100, 14.Google Scholar
6. Aydin, , & Faraggiana, ,: 1978, A&A, Sup., 34, 51.Google Scholar
7. Mennickent, , & Vogt, ,: 1991, A&A, 241, 159.Google Scholar
8. McLaughlin, ,: 1962, ApJ, Sup., 7, 65.Google Scholar
9. Hubert, Floquet et al.: 1987, A&A. Sup., 70, 443.Google Scholar
10. Kogure, & Suzuki, ,: 1987, in Physics of Be Stars, eds. Slettebak & Snow, p. 192.Google Scholar