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Title:
On the time variability of Circinus X-1 - A comparison with Cygnus X-1
Authors:
Weisskopf, M. C.; Sutherland, P. G.
Affiliation:
AA(NASA, Marshall Space Flight Center, Huntsville, Ala.)
Publication:
Astrophysical Journal, Part 1, vol. 236, Feb. 15, 1980, p. 263-269. (ApJ Homepage)
Publication Date:
02/1980
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
Binary Stars, Stellar Spectra, Variable Stars, X Ray Stars, Black Holes (Astronomy), Shot Noise, Stellar Models, Time Response
DOI:
10.1086/157742
Bibliographic Code:
1980ApJ...236..263W

Abstract

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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