Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993a%26a...274l..41o&link_type=abstract
Astronomy and Astrophysics, Vol. 274, NO. 3/JUL(III), P. L41, 1993
Astronomy and Astrophysics
Astrophysics
18
Accretion, Accretion Disks, Stars: Novae, Cataclysmic Variables, White Dwarfs, X-Rays: Stars.
Scientific paper
The recurrent nova RS Ophiuchi was detected at quiescence by the ROSAT PSPC, with net count rate 0.0104 ± 0.0015 cts -1. The counts, strongly peaked around 1 KeV, were not detected below 0.5 KeV. The best spectral fits of an optically thin model of thermal plasma in the admitted range of Nβ imply a temperature 1.1-1.3 KeV and flux 1.6-3.4 × 10-13 ergs cm-2 s-1, corresponding to a soft X-rays luminosity Lχ≃ 2.8 × 1031-1.64 × 1032 erg s-1. This poses strong constraints on the models proposed for the system. It can be ruled out that the X-ray flux is due to ongoing hydrogen burning. If it is emitted by the boundary layer of an accretion disk around a high mass white dwarf, the mass accretion rate is Mṡ < 10-9 Msun yr-1, not sufficiently high to power a thermonuclear runaway on the surface of a white dwarf every ≃20 yrs.
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