Volume 559, November 2013
|Number of page(s)||8|
|Section||Stellar structure and evolution|
|Published online||20 November 2013|
Hα observations of the γ-ray-emitting Be/X-ray binary LSI+61°303: orbital modulation, disk truncation, and long-term variability ⋆,⋆⋆
Institute of Astronomy and National Astronomical Observatory, Bulgarian
Academy of Sciences,
72 Tsarighradsko Shousse Blvd.,
e-mail: firstname.lastname@example.org; email@example.com; firstname.lastname@example.org
2 Departamento de Física (EPSJ), Universidad de Jaén, Campus Las Lagunillas, A3-420, 23071 Jaén, Spain
3 Department of Astronomy, St. Kliment Ohridski University of Sofia, 5 James Bourchier Blvd., 1164 Sofia, Bulgaria
4 Department of Physics and Astronomy, Pevensey II Building, University of Sussex, Falmer, Brighton BN1 9QH, UK
5 Departamento de Ingeniería Mecánica y Minera (EPSJ), Universidad de Jaén, Campus Las Lagunillas A3-008, 23071 Jaén, Spain
Received: 30 May 2013
Accepted: 10 September 2013
We report 138 spectral observations of the Hα emission line of the radio- and γ-ray-emitting Be/X-ray binary LSI+61°303 obtained during the period of September 1998 – January 2013. From measuring various Hα parameters, we found that the orbital modulation of the Hα is best visible in the equivalent width ratio EW(B)/EW(R), the equivalent width of the blue hump, and in the radial velocity of the central dip. The periodogram analysis confirmed that the Hα emission is modulated with the orbital and superorbital periods. For the past 20 years the radius of the circumstellar disk is similar to the Roche lobe size at the periastron. It is probably truncated by a 6:1 resonance. The orbital maximum of the equivalent width of Hα emission peaks after the periastron and coincides on average with the X-ray and γ-ray maxima. All the spectra are available upon request from the authors and through the CDS.
Key words: stars: individual: LSI+61303 / stars: winds, outflows / stars: emission-line, Be / X-rays: binaries
Table 1 and all the spectra are only available at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (22.214.171.124) or via http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/559/A87
© ESO, 2013
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