Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992pasj...44..117m&link_type=abstract
PASJ: Publications of the Astronomical Society of Japan (ISSN 0004-6264), vol. 44, no. 2, 1992, p. 117-123. Research supported b
Astronomy and Astrophysics
Astronomy
25
Accretion Disks, Novae, Stellar Luminosity, Variable Stars, X Ray Binaries, Ginga Satellite, Light Curve, Proportional Counters, Stellar Mass, Stellar Models
Scientific paper
X-ray scan observations of the X-ray novae GS 2000 + 25 and GS 2023 + 338 during quiescence are presented. The upper limit to the soft and hard X-ray luminosity of the quiescent GS 2000 + 25 is found to be (3-9) x 10 exp 33 erg/s. For such X-ray illumination the thermal instability of the disk cannot be suppressed, whereas the mass overflow instability of the companion star is hard to trigger. An X-ray source with an X-ray intensity of about 10 exp 34 erg/s at a distance of 0.1 arc deg from GS 2023 + 338 after eruption is found. If this X-ray source is GS 2023 + 338 itself, the estimated X-ray luminosity could be consistent with the mass-overflow instability model. If not, nothing definite can be concluded concerning this model. In any case, X-rays are still too weak to suppress the thermal instability of the disk.
Ebisawa Ken
Hayashida Kiyoshi
Kitamoto Shunji
Mineshige Shin
Miyamoto Sigenori
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