Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996apj...466..410o&link_type=abstract
Astrophysical Journal v.466, p.410
Astronomy and Astrophysics
Astronomy
25
Stars: Binaries: Close, Stars: Individual Constellation Name: Nova Puppis 1991, Stars: Novae, Cataclysmic Variables, X-Rays: Stars
Scientific paper
Nova Puppis 1991 (V351 Pup) was observed and detected in X-rays by the ROSAT Position Sensitive Proportional Counter 16 months after the visual maximum with a count rate of 0.223±0.005 counts s-1. With follow-up optical observations we determined the value E(B - V) = 0.3±0.1 for the interstellar absorption and D = 4.7±0.6 kpc as the distance to the nova. The best spectral fit to the X-ray data is a model of thermal plasma at temperature kT ≃ 1.1 keV and source flux fx ≃ 3 x 1012 ergs cm-2 s-1 in the range 0.2-2.4 keV, implying an X-ray source luminosity of 7.5 x 1033 ergs s-1. The source brightness varied between the two ROSAT exposures taken 2 days apart. The X-ray emission could be due to restored accretion at a very high rate or to shocks in the ejected shell; it does not have the characteristics of a "supersoft" thermal X-ray source associated with nuclear burning on a white dwarf. Nova Puppis 1991 is the third classical nova that emits hard X-rays, among five that have been observed by ROSAT during outburst.
Balman Soelen
Della Valle Massimo
Gallagher John Jay
Oegelman Hakki
Orio Marina
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