On the time variability of Circinus X-1 - A comparison with Cygnus X-1

Details On the time variability of Circinus X-1 - A comparison with Cygnus X-1 On the time variability of Circinus X-1 - A comparison with Cygnus X-1

Feb 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980apj...236..263w&link_type=abstract

Astrophysical Journal, Part 1, vol. 236, Feb. 15, 1980, p. 263-269.

Astronomy and Astrophysics

Astronomy

2

Binary Stars, Stellar Spectra, Variable Stars, X Ray Stars, Black Holes (Astronomy), Shot Noise, Stellar Models, Time Response

Scientific paper

The time variability and spectral characteristics obtained from Uhuru observations of Cir X-1 (4U 1515-56) are compared with observations of Cyg X-1 (4U 1956+35). It is found that Cir X-1 has a more variable spectrum (with perhaps a state over the 4 days spanned by the data), is less 'noisy', and has correlated fluctuations (as evidenced by the nonzero cross-correlation function between two energy bands) of shorter duration than those present in the shot noise of Cyg X-1.

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