Evidence of H alpha periodicities in LS I+61303

Details Evidence of H alpha periodicities in LS I+61303 Evidence of H alpha periodicities in LS I+61303

1999-09-14

arxiv.org/abs/astro-ph/9909233v1

Astron.Astrophys. 351 (1999) 543-550

Astronomy and Astrophysics

Astrophysics

8 pages, 5 figures, LaTeX, uses aa.cls. Accepted for publication in A&A

Scientific paper

We present the results of analyzing H$\alpha$ spectra of the radio emitting X-ray binary LS I+61303. For the first time, the same 26.5 d radio period is clearly detected in the H$\alpha$ emission line. Moreover, the equivalent width and the peak separation of the H$\alpha$ emission line seem also to vary over a time scale of 1600 days. This points towards the $\sim4$ yr modulation, detected in the radio outburst amplitude, being probably a result of variations in the mass loss rate of the Be star and/or density variability in the circumstellar disk. In addition, the dependence of the peak separation from the equivalent width informs us that the LS I+61303 circumstellar disk is among the densest of Be-stars.

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