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Evidence of Halpha periodicities in LSI+61·303
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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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ZAMANOV, R. K., et al. Evidence of Halpha periodicities in LSI+61·303. Astronomy and Astrophysics. 1999. Vol. 351, num. 2, pags. 543-550. ISSN 0004-6361. [consulted: 1 of August of 2026]. Available at: https://hdl.handle.net/2445/45407