Hostname: page-component-cd9895bd7-jn8rn Total loading time: 0 Render date: 2024-12-26T04:59:14.667Z Has data issue: false hasContentIssue false
  • English
  • Français

Long-Term Behaviour of the Variable Wind of P Cygni

Published online by Cambridge University Press:  12 April 2016

Indrek Kolka
Indrek Kolka*
Affiliation:
Tartu Observatory, 61602 Tōravere, Estonia

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.

P Cygni has been for a long time an often-used target of observations, and a test object to prove several modelling approaches (cf. e.g. Najarro et al. 1997, and references therein). However, the origin of it’s stable variability pattern with moderate amplitudes is poorly known yet. In this contribution I will concentrate on the spectroscopic variability. A more elaborated version of this paper considering many kinds of variability data on P Cygni will be published elsewhere (Kolka 1998).

The striking phenomenon in the spectra of P Cygni is the cyclic drift of subsequent individual components through the absorption part of the P Cyg-type profile. This is demonstrated in Fig.1a in the case of three Balmer lines in 1982 (the data adopted from Markova, Kolka 1989). Every new drift-cycle starts when the component with smaller Doppler-shift becomes deeper than it’s neighbour.

Type
Section III Variable Winds
Information
International Astronomical Union Colloquium , Volume 169: Variable and Non-spherical Stellar Winds in Luminous Hot Stars , 1999 , pp. 268 - 271
Copyright
Copyright © Springer-Verlag 1999

References

Kolka, I. (1994): IAU Symp. 162: Pulsation, Rotation and Mass Loss in Early-Type Stars, eds. Balona, L.A., Henrichs, H.F., Le Contel, J.M., Kluwer, Dordrecht, 536 Google Scholar
Kolka, I. (1998): Baltic Astronomy (submitted)Google Scholar
Markova, N. (1998): poster at this ColloquiumGoogle Scholar
Markova, N., Kolka, I. (1989): Tartu Teated No. 103, 3–15 Google Scholar
Najarro, F., Hillier, D.J., Stahl, O. (1997): A&A,326, 1117 Google Scholar
Percy, J.R., Attard, A., Szczesny, M. (1996): A&A,117, 255 Google Scholar
Stahl, O., Kaufer, A., et al. (1995): The Journ. of Astron. Data, 1, ( CD-ROM)Google Scholar
Taylor, M., Nordsieck, K.H., et al. (1991): AJ, 102, 1197 CrossRefGoogle Scholar