Short period line profile and light variations in the Be star ? Orionis
- Author(s)
- Luis A. Balona, Conny Aerts, Hrvoje Bozic, Edward F. Guinan, Gerald Handler, David J. James, Anthony B Kaye, R R Shobbrook
- Abstract
We present the results of a multisite spectroscopic and photometric campaign on the Be star ? Orionis. From the photometry and radial velocity variation of several spectral lines, we confirm that the star is a variable with period P = 0.97 d. Only one period can be extracted from both the photometric and radial velocity observations. We find that the projected rotational velocity from the helium lines (v sin i = 173 km s-1) is considerably smaller than from the metal lines (v sin i = 226 km s-1). The line profiles show an excess absorption feature moving from blue to red for half the period and from red to blue for the other half of the period. Another excess absorption feature moves exactly out of phase. The excess absorption features are present in photospheric lines as well as in lines which are significantly affected by circumstellar material, such as Hß. From this we conclude that the periodic variations are most probably associated with corotating circumstellar material.
- Organisation(s)
- Department of Astrophysics
- External organisation(s)
- South African Astronomical Observatory (SAAO), Katholieke Universiteit Leuven, University of Zagreb, Villanova University, Observatoire des sciences de l'univers de Grenoble, Los Alamos National Laboratory, Australian National University
- Journal
- Monthly Notices of the Royal Astronomical Society
- Volume
- 327
- Pages
- 1288-1296
- No. of pages
- 9
- ISSN
- 0035-8711
- Publication date
- 2001
- Peer reviewed
- Yes
- Austrian Fields of Science 2012
- 103003 Astronomy
- Portal url
- https://ucrisportal.univie.ac.at/en/publications/b7ed5cee-c631-41c8-bc53-9bfca27b2581