A search for rapid optical periodicities from CYG X-1

Details A search for rapid optical periodicities from CYG X-1 A search for rapid optical periodicities from CYG X-1

Jan 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978natur.271...40r&link_type=abstract

Nature, vol. 271, Jan. 5, 1978, p. 40.

Astronomy and Astrophysics

Astronomy

1

Black Holes (Astronomy), Light Emission, Periodic Variations, Stellar Mass Accretion, Stellar Models, Supergiant Stars, X Ray Sources, Cygnus Constellation, Photometers, Ubv Spectra

Scientific paper

An accretion disc produced by the blue supergiant companion star of Cyg X-1 is said to be responsible for the latter's production of X-rays. Variations in optical periodicity (on a time scale of days) are mentioned, but only one case of extremely rapid optical variability has thus far been reported. Nearly periodic pulse trains lasting between 6 and 10 minutes, and consisting of over 4000 pulses were measured during an accumulated total of two hours of observations. These data suggest a reexamination of present models of Cyg X-1 in particular, and of accretion discs in general.

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