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Astron. Astrophys. 325, L1-L4 (1997)

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Letter to the Editor

A transient supersoft X-ray source in the Large Magellanic Cloud *

Marina Orio 1, 2, Massimo Della Valle 3, Giuseppe Massone 1 and Hakk Ögelman 2

1 Osservatorio Astronomico di Torino, I-10025 Pino Torinese (TO), Italy
2 Department of Physics, University of Wisconsin-Madison, 1150 University Ave., Madison, WI 53706, USA
3 Dipartimento di Astronomia, Università di Padova, Italy

Received 11 March 1997 / Accepted 1 April 1997


We present new X-ray data with an improved position for the supersoft X-ray source RX J0537.7-7034 and propose a candidate for the optical identification. The X-ray source had an "on" and an "off" state and was variable on a time scale of months. The proposed optical counterpart is displaced by only 9 arcsec; it is a blue variable star whith an amplitude modulation in the optical light curve. The optical spectrum shows a blue continuum and the He II [FORMULA] 4686 emission line.

Key words: Accretion, accretion disks – Stars: binaries: close; white dwarfs – X-rays: stars.

* Partially based on observations at ESO, La Silla.

Send offprint requests to: M. Orio

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© European Southern Observatory (ESO) 1997

Online publication: May 5, 1998