Please use this identifier to cite or link to this item: http://hdl.handle.net/2445/45407
 Title: Evidence of Halpha periodicities in LSI+61·303 Author: Zamanov, R. K.Martí Ribas, JosepParedes i Poy, Josep MariaFabregat, J.Ribó Gomis, MarcTarasov, A. E. Keywords: EstelsEstels binaris de raigs XRadioastronomiaAstrofísicaStarsX-ray binariesRadio astronomyAstrophysics Issue Date: 1999 Publisher: Springer Verlag Abstract: 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. Note: Versió postprint del document publicat en paper It is part of: Astronomy and Astrophysics, 1999, vol. 351, num. 2, p. 543-550 URI: http://hdl.handle.net/2445/45407 ISSN: 0004-6361 Appears in Collections: Articles publicats en revistes (Física Quàntica i Astrofísica)

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