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Astron. Astrophys. 344, L13-L16 (1999)


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Letter to the Editor

LMC 1995, the third supersoft X-ray nova

M. Orio 1,2 and J. Greiner 3

1 Department of Physics, 1150 University Ave., Madison WI 53706, USA (orio@astrog.physics.wisc.edu)
2 Osservatorio Astronomico di Torino, Strada Osservatorio 20, I-10025 Pino Torinese (TO), Italy
3 Astrophysikalisches Institut, An der Sternwarte 16, D-14482 Potsdam, Germany (jgreiner@aip.de)

Received 22 January 1999 / Accepted 19 February 1999

Abstract

Nova LMC 1995 was detected with ROSAT as an X-ray source in repeated observations between 1995 and 1998, starting five months after the outburst. In February 1998, 3 years after the nova outburst, ROSAT PSPC data show that this is the only LMC post-nova - and one out of three among [FORMULA]100 altogether - that appeared as a bright supersoft X-ray source after the outburst. The PSPC data are satisfactorily fitted with an LTE carbon-oxygen atmosphere model for a 1.2 [FORMULA] white dwarf, resulting in an effective temperature about 30 eV. The X-ray flux increased in the last years and at present Nova LMC 1995 is about twice as bright as in a 1996 observation. We suggest that the photosphere is still shrinking and the remnant becoming hotter. Such a nova is a likely type Ia SN progenitor.

Key words: stars: binaries: close – stars: individual: N LMC 1995 – stars: mass-loss – stars: novae, cataclysmic variables – stars: white dwarfs – X-rays: stars

Send offprint requests to: M. Orio

© European Southern Observatory (ESO) 1999

Online publication: March 18, 1999

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