Evidence for weak X-ray burst emission from Cygnus X-2 and GX 17 + 2

Details Evidence for weak X-ray burst emission from Cygnus X-2 and GX 17 + 2 Evidence for weak X-ray burst emission from Cygnus X-2 and GX 17 + 2

Jun 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984apj...281..826k&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 281, June 15, 1984, p. 826-829.

Astronomy and Astrophysics

Astrophysics

55

Binary Stars, Neutron Stars, Stellar Mass Accretion, X Ray Sources, Black Body Radiation, Bremsstrahlung, Cygnus Constellation, Thermonuclear Explosions

Scientific paper

Events resembling weak X-ray bursts have been detected from the two strong persistent sources, Cygnus X-2 and GX 17+2. Both events exhibit rise times less than 2.56 s and 1.2 - 14.4 keV decay times of approximately 5 - 10 s. The event from Cyg X-2 is similar to a type I burst in terms of blackbody temperature and peak luminosity, and it is shown that it can be plausibly interpreted as a thermonuclear flash from an accreting neutron star. The GX 17+2 event exhibits a considerably harder X-ray spectrum which makes it unlikely to be a thermonuclear flash. This event could arise from an accretion instability as in type II bursts.

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