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Astron. Astrophys. 351, 543-550 (1999)

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Evidence of H[FORMULA] periodicities in LS I+61o303

R.K. Zamanov 1, J. Martí 2, J.M. Paredes 3, J. Fabregat 4, M. Ribó 3 and A.E. Tarasov 5

1 National Astronomical Observatory Rozhen, P.O.Box 136, 4700 Smoljan, Bulgaria
2 Departamento de Física, Escuela Politécnica Superior, Universidad de Jaén, C/ Virgen de la Cabeza, 2, 23071 Jaén, Spain
3 Departament d'Astronomia i Meteorologia, Universitat de Barcelona, Av. Diagonal 647, 08028 Barcelona, Spain
4 Departamento de Astronomía, Universidad de Valencia, 46100 Burjassot, Valencia, Spain
5 Crimean Astrophysical Observatory, 334413 Nauchny, Crimea, Ukraine

Received 25 March 1999 / Accepted 21 July 1999

Abstract

We present the results of analyzing H[FORMULA] spectra of the radio emitting X-ray binary LS I+61o303. For the first time, the same 26.5 d radio period is clearly detected in the H[FORMULA] emission line. Moreover, the equivalent width and the peak separation of the H[FORMULA] emission line seem also to vary over a time scale of 1600 days. This points towards the [FORMULA] 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+61o303 circumstellar disk is among the densest of Be-stars.

Key words: stars: individual: LS I+61O 303 – stars: emission-line, Be – radio continuum: stars – X-rays: stars

Send offprint requests to: R. Zamanov (rozhen@mbox.digsys.bg)

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© European Southern Observatory (ESO) 1999

Online publication: November 3, 1999
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