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Astron. Astrophys. 318, 490-494 (1997)

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RX J0529.8-6556: a new pulsating Be/X-ray transient in the LMC

F. Haberl 1, K. Dennerl 1, W. Pietsch 1 and K. Reinsch 2

1  Max-Planck-Institut für extraterrestrische Physik, Giessenbachstraße, D-85748 Garching, Germany
2  Sternwarte, Geismarlandstraße 11, D-37083 Göttingen, Germany

Received 16 April 1996 / Accepted 11 July 1996


We report the discovery of RX J0529.8-6556, a new transient X-ray source in the direction of the Large Magellanic Cloud. From 32 pointed ROSAT observations distributed over 3.5 years one single outburst with 0.25 cts s-1 was detected while from most observations only upper limits could be derived. During the outburst periodic modulation of the X-ray flux with a period of 69.5 s is seen. Optical spectra taken from the B = 14.5 mag star closest to the X-ray position, reveal the presence of an H [FORMULA] emission line and yield a spectral type of B2e. The radial velocities derived from the Balmer absorption lines are consistent with that of the Large Magellanic Cloud. Thus RX J0529.8-6556 is the fifth accretion powered X-ray binary pulsar, the fourth with a Be star companion, known in this nearby galaxy.

Key words: stars: binaries – stars: neutron – stars: emission-line, Be – stars: individual: RX J0529.8-6556 – X-rays: stars

Send offprint requests to: F. Haberl

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© European Southern Observatory (ESO) 1997

Online publication: July 8, 1998