Correlated optical-X-ray variability in the high-mass X-ray binary SAX J2103.5 4545 - Astrophysics > High Energy Astrophysical PhenomenaReportar como inadecuado




Correlated optical-X-ray variability in the high-mass X-ray binary SAX J2103.5 4545 - Astrophysics > High Energy Astrophysical Phenomena - Descarga este documento en PDF. Documentación en PDF para descargar gratis. Disponible también para leer online.

Abstract: SAX J2103.5+4545 is the Be-X-ray binary with the shortest orbital period. Itshows 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 theX-ray and optical variability and to characterise the spectral and timingproperties of the bright and faint states. We have found a correlation betweenthe spectral and temporal parameters that fit the energy and power spectra.Softer energy spectra correspond to softer power spectra. That is to say, whenthe energy spectrum is soft the power at high frequencies is suppressed. Wealso present the results of our monitoring of the Halpha line of the opticalcounterpart since its discovery in 2003. There is a correlation between thestrength and shape of the Halpha line, originated in the circumstellar envelopeof the massive companion and the X-ray emission from the vicinity of theneutron star. Halpha emission, indicative of an equatorial disc around theB-type star, is detected whenever the source is bright in X-rays. When the discis absent, the X-ray emission decreases significantly. The long-termvariability of SAX J2103.5+4545 is characterised by fast episodes of disc lossand subsequent reformation. The time scales for the loss and reformation of thedisc about 2 years are the fastest among Be-X-ray binaries.



Autor: P. Reig FORTH, Univ. Crete, A. Slowikowska FORTH, Univ. Crete, A Zezas FORTH, Univ Crete, P. Blay Univ. Valencia

Fuente: https://arxiv.org/







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