On X-ray Variability in Active Binary Stars

Details On X-ray Variability in Active Binary Stars On X-ray Variability in Active Binary Stars

1999-05-10

arxiv.org/abs/astro-ph/9905109v1

Astronomy and Astrophysics

Astrophysics

27 pages postscript, 5 embedded figures. accepted for publication in ApJ

Scientific paper

10.1086/307821

We compare the count-rates of active binaries observed by Einstein and ROSAT. We find significant evidence for short-term variability (approx 0.32) and marginal evidence for a larger variability at longer timescales (approx 0.38). Modeling this excess as cyclic variability, we place an upper limit on the relative amplitude of the cyclic component (I_cyc/I_min < 4) for active binaries, significantly less than the variations seen in the Solar X-ray output over the Solar cycle.

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