EDP Sciences Journals List
Advanced Search
Subscriber Authentication Point
Home All issues Volume 411/2 Article
Free access article

Issue A&A
Volume 411, Number 2, November IV 2003
Page(s) 181 - 191
Section Stellar atmospheres
DOI http://dx.doi.org/10.1051/0004-6361:20031375



A&A 411, 181-191 (2003)
DOI: 10.1051/0004-6361:20031375

Stellar and circumstellar activity of the Be star $\omega$ CMa

III. Multiline non-radial pulsation modeling
M. Maintz1, Th. Rivinius1, 2, S. Stefl3, D. Baade2, B. Wolf1 and R. H. D. Townsend4

1  Landessternwarte Königstuhl, 69117 Heidelberg, Germany
2  European Southern Observatory, Karl-Schwarzschild-Str. 2, 85748 Garching bei München, Germany
3  Astronomical Institute, Academy of Sciences, 251 65 Ondrejov, Czech Republic
4  Department of Physics and Astronomy, University College London, Gower Street, London WC1E 6BT, UK

(Received 12 May 2003/ Accepted 21 August 2003)

Abstract
The line profile variability of $\omega$ CMa is modeled for various photospheric absorption lines of different ions as non-radial pulsation. The retrograde pulsation suggested by Baade (1982) could be confirmed. Due to rapid rotation, the line profile variability appears prograde, however. The line profiles could be reproduced in great detail, including prominent structures like "spikes" and "ramps". These features arise naturally from the pole-on orientation of the star together with high-amplitude pulsation in g-modes, i.e. with horizontal motions being dominant. The change of the line profile variability during outbursts (understood as the beginning of phases of high brightness) reported in paper II of this series can also be understood within the framework of non-radial pulsation if veiling effects of the circumstellar disk are taken into account. It is concluded that the coherent periodic line profile variability of the absorption lines of  $\omega$ CMa can be explained by non-radial pulsation in detail.


Key words: stars: oscillations -- stars: individual: $\omega$ (28) CMa -- stars: emission line, Be

Offprint request: Th. Rivinius, triviniu@lsw.uni-heidelberg.de

SIMBAD Objects



© ESO 2003


What is OpenURL?

The OpenURL standard is a protocol for transmission of metadata describing the resource that you wish to access. An OpenURL link contains article metadata and directs it to the OpenURL server of your choice. The OpenURL server can provide access to the resource and also offer complementary services (specific search engine, export of references...). The OpenURL link can be generated by different means.
  • If your librarian has set up your subscription with an OpenURL resolver, OpenURL links appear automatically on the abstract pages.
  • You can define your own OpenURL resolver with your EDPS Account. In this case your choice will be given priority over that of your library.
  • You can use an add-on for your browser (Firefox or I.E.) to display OpenURL links on a page (see http://www.openly.com/openurlref/). You should disable this module if you wish to use the OpenURL server that you or your library have defined.