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Astron. Astrophys. 358, L55-L58 (2000)

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Letter to the Editor

First correlation between compact object and circumstellar disk in the Be/X-ray binaries

R. Zamanov 1,2 and J. Martí 1

1 Departamento de Física, Escuela Politécnica Superior, Universidad de Jaén, C/ Virgen de la Cabeza, 2, 23071 Jaén, Spain
2 National Astronomical Observatory Rozhen, P.O.Box 136, 4700 Smoljan, Bulgaria

Received 24 February 2000 / Accepted 2 May 2000


A remarkable correlation between the H[FORMULA] emission line and the radio behaviour of LS I+61o303 over its [FORMULA]4 yr modulation is discovered. The radio outburst peak is shifted by a quarter of the [FORMULA]4 yr modulat ion period (about 400 days) with respect to the equivalent width of the H[FORMULA] emission line variability. The onset of the LS I+61o303 radio outbursts varies in phase with the changes of the H[FORMULA] emission line, at least during the increase of H[FORMULA] equivalent width. This is the first clear correlation between the emission associated to the compact object and the Be circumstellar disk in a Be/X-ray binary system.

Key words: stars: individual: – X-rays: stars – radio continuum: stars – stars: emission-line, Be

Send offprint requests to: J. Martí (jmarti@ujaen.es)

© European Southern Observatory (ESO) 2000

Online publication: June 20, 2000