Hostname: page-component-7bb8b95d7b-dtkg6 Total loading time: 0 Render date: 2024-09-13T15:19:41.171Z Has data issue: false hasContentIssue false
  • English
  • Français

The hard life of clumps in atmospheres of early-type stars

Published online by Cambridge University Press:  26 May 2016

A.F. Kholtygin
A.F. Kholtygin*
Affiliation:
Astronomical Institute, St. Petersburg University, 198904, St. Petersburg, Petrodvoretz, Russia E-Mail: [email protected], [email protected]

Abstract

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.

As has been recently established, the atmospheres of early-type stars are strongly disheveled. These atmospheres consist of dense clumps and a more rarefied interclump medium. We consider the forces that determine the motion of the clumps. We show that the main force is gravitational attraction of the clumps to the star. For stars with a high effective temperature (Teff ≥ 6 · 104 K) it appears that the clump/interclump gas number density ratio is ≥ 30. In this case we can conclude that the clumps are formed by shock waves. Some evidence as to the existence of gas jets in the atmospheres of Wolf-Rayet stars have recently been presented. We propose that such jets may be a common feature of all early-type stars. Profiles of HeI lines in spectra of clumped atmospheres with jets have been calculated.

Type
7. OB Stellar Winds
Information
Symposium - International Astronomical Union , Volume 162: Pulsation, Rotation and Mass Loss in Early-Type Stars , 1994 , pp. 505 - 506
Copyright
Copyright © Kluwer 1994 

References

Andrillat, Y., Vreux, J.-M.: 1988, Astr. Ap. 253, L37 Google Scholar
Antokhin, I.I., Kholtygin, A.F., Cherepaschuck, A.M.: 1988, Sov. Ast. Zh. 32, 285 Google Scholar
Cherepaschuck, A.M.: 1990, Astron. Zh. 67, 955 Google Scholar
Eenens, P.R.J.: 1991, Ph.D. Thesis, Univ. of Edinburg, 1991 ,Google Scholar
Floquet, M., Hubert, A.M., Janot-Pacheco, E., Mekkas, A., Hubert, H., Leister, N.V.: 1992, Astr. Ap. 254, 177 Google Scholar
Grinin, V.P.: 1988, Pis'ma v Astron Zh. 14, 65 Google Scholar
Kholtygin, A.F.: 1988, “Wolf-Rayet stars and related objects”, Tallinn , 115 Google Scholar
Lamers, H.J.G.L.M., Snow, T.P., de Jager, C., Langerwerf, A.: 1988, Ap. J 325, 342 CrossRefGoogle Scholar
Owocki, S.P., Castor, J.I., Rybicki, G.B.: 1988, Ap. J 335, 914 Google Scholar
Pogodin, M.A.: 1990, Astrofizika 32, 371 Google Scholar
Robert, C., Moffat, A.F.J., Drissen, L., Lamontagne, R., Seggewiss, W., Niemela, V.S., Cerruti, M.A., Barrett, P., Bailey, J., Garcia, J., Tapia, S.: 1992, Ap. J 397, 277 Google Scholar
Voschinnikov, N.V., Grinin, V.P.: 1991, Astrofizika 34, 181 Google Scholar