Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975natur.256..111h&link_type=abstract
Nature, vol. 256, July 10, 1975, p. 111, 112.
Astronomy and Astrophysics
Astronomy
17
Radiant Flux Density, Radio Sources (Astronomy), Stellar Radiation, Variable Stars, X Ray Astronomy, X Ray Stars, Binary Stars, Black Holes (Astronomy), Radio Stars
Scientific paper
The sudden appearance of a faint radio source inside the probable position region for the X-ray source Cyg X-1 was associated with major changes in the X-ray emission observed during the period February-May 1971. The accurate position of the radio source led to an identification with the bright, blue star HDE226868. Optical investigations have established this object to be a binary system with a massive, invisible component that may be a black hole. One of the major characteristics of the Cyg X-1 radio source between March 31, 1971 and March 1975 is a flat radio spectrum, a spectral index of 0. The mean daily levels of Cyg X-1 during the period May 9 to May 20, 1975 are 0.031 Jy at 8,085 MHz, and 0.002 Jy at 2,695 MHz, representing a new state for the radio source.
Gibson David M.
Hjellming Robert M.
Owen Frazer N.
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