Correlated optical/X-ray variability in the high-mass X-ray binary SAX J2103.5+4545
SAX J2103.5+4545 is the Be/X-ray binary (BeX) with the shortest orbital period. It shows extended bright and faint X-ray states that last for a few hundred days. The main objective of this work is to investigate the relationship between the X-ray and optical variability and to characterize the spectral and timing properties of the bright and faint
Reig, P. et al.
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2010