Astronomy and Astrophysics – Astronomy
Scientific paper
May 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998astl...24..277b&link_type=abstract
Astronomy Letters, Volume 24, Issue 3, May 1998, pp.277-282; Pis'ma v Astronomicheskii Zhurnal, Vol. 24, p. 330
Astronomy and Astrophysics
Astronomy
5
Scientific paper
In May 1997, an optical flare was observed in the X-ray binary system Cyg X-1/V1357 Cyg, the strongest flare in the 26 years of its study. For 2.5 hours of observations on May 14/15, the system's brightness exceeded the level of regular ellipsoidal variability by about 15% in U, 12% in B, and a mere 2% in V. The color properties of the flare correspond to the emission of a hydrogen plasma. The Balmer lines and the Balmer continuum fall within the U and B bands, but do not affect the V band. Estimates show that the observed characterstics correspond to a rapidly expanding cloud of gas (v~ 1500 km s^-1) with a temperature of 20,000 K, which is observed when the optical depths in the Hβ_Hepsolon lines are of the order of unity. The size of the emitting region s ~ 3 x 10^12 cm, the gas number density is ~ 3 x 10^11 cm^-3, and the expansion time is ~6 h.
Bochkarev Nikolai G.
Lyutyi V. M.
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