SIMBAD references

2019ApJ...871..244A - Astrophys. J., 871, 244-244 (2019/February-1)

The period change of Cyg X-3.


Abstract (from CDS):

By using available archival X-ray data, we significantly extended the list of times of X-ray minima. The new list includes 65 data points obtained by critically reanalyzing RXTE ASM data, 88 data points based on observations by MAXI, and 2 data points based on observations by SUZAKU and AstroSat. Analyzing the data along with times of X-ray minima available from the literature, we provide the most accurate estimate of the rate of period change to date. We do not confirm the existence of a second derivative of the orbital period suggested by some authors earlier. Instead, we find that the changes in the period can be fit by a sum of quadratic and sinusoidal functions. The period of sinusoidal variations is 15.79 yr. They can be related either to apsidal motion in the close binary with eccentricity e ≃ 0.03 or to the presence of a third body with a mass of about 0.7 M located at a distance ∼16 au from the close binary.

Abstract Copyright: © 2019. The American Astronomical Society. All rights reserved.

Journal keyword(s): accretion, accretion disks - binaries: close - stars: individual: Cyg X-3 - X-rays: binaries

VizieR on-line data: <Available at CDS (J/ApJ/871/244): table1.dat>

Simbad objects: 3

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