Optical variabilities in Be/X-ray binary system:GRO J2058+42

Abstract

We present an analysis of long-term optical monitoring observations and optical spectroscopic observations of the counterpart to CXOU J205847.5+414637 (high mass X-ray binary system). We search for a variability in the light curve of Be star. We used differential magnitudes in the time series analysis. The variability search in the optical light curve was made by using different algorithms. The reduction and analysis of spectra were done by using MIDAS and its suitable packages. We have performed a frequency search which gave us the value 2.404 1/day. This value is attributed to the non-radial pulsation of Be star. H alpha emission line profiles always show double-peaked emissions with a mean equivalent width of 2.31 \pm 0.19 Å~and a peak separation of 516 \pm 45 km/s. This suggests that Be star disk is still present. CXOU J205847.5+414637 is in X-ray quiescent state.

8 pages, 9 figures. To appear at Astronomy and Astrophysics

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Cited by in corpus (8)

• Long-term variability of high-mass X-ray binaries. I.Photometry
• Optical and X-ray Outbursts of Be/X-ray binary system SAX J2103.5+4545
• Optical spectroscopy of the Be/X-ray Binary V850 Cen/GX 304-1 during faint X-ray periodical activity
• Detection of a large Be circumstellar disk during X-ray quiescence of XTE J1946+274
• Optical and near-infrared photometric monitoring of the transient X-ray binary A0538-66 with REM
• Fast time optical variability in Be/X-ray binaries. Pulsation and rotation
• Long-term optical variability of the Be/X-ray binary GRO J2058+42
• Long-term optical variability of high-mass X-ray binaries. III. Polarimetry