Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980apj...237..154c&link_type=abstract
Astrophysical Journal, Part 1, vol. 237, Apr. 1, 1980, p. 154-162.
Astronomy and Astrophysics
Astronomy
37
Binary Stars, Flare Stars, X Ray Astronomy, X Ray Stars, Emission Spectra, Radio Sources (Astronomy), Satellite Observation, Spaceborne Astronomy, Stellar Spectra
Scientific paper
During the summer of 1978 the recurrent transient X-ray source, Aquila X-1, underwent its first major outburst in two years. This paper presents the results of extensive X-ray and optical observations of this event, which lasted for about two months. The peak X-ray luminosity was about 1.3 times that of the Crab and exhibited spectrum-dependent flickering on time scales of about 5 minutes. In addition, one very large flare was observed about one month after maximum that was also correlated with spectral changes. During this flare the previously identified optical counterpart brightened from V = 19 to a peak of V = 14.8, where it was distinctly blue (U - B = 0.4), and then reddened during the decay. These observations are interpreted in terms of a standard accretion disk model with particular emphasis on the similarities to Sco -1 and other dwarf X-ray systems.
Bowyer Stuart
Charles Phil A.
Clark George W.
Holt Stephen S.
Junkkarinen Vesa T.
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