Volume 561, January 2014
|Number of page(s)||4|
|Published online||20 December 2013|
Connection between orbital modulation of Hα and gamma-rays in the Be/X-ray binary LS I+61°303
1 Institute of Astronomy and National Astronomical Observatory, Bulgarian Academy of Sciences, 72 Tsarigradsko Shose Blvd., 1784 Sofia, Bulgaria
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2 Departamento de Física (EPSJ), Universidad de Jaén, Campus Las Lagunillas, A3-420, 23071 Jaén, Spain
Received: 29 October 2013
Accepted: 26 November 2013
We studied the average orbital modulation of various parameters (γ-ray flux, Hα emission line, optical V band brightness) of the radio- and γ-ray emitting Be/X-ray binary LS I + 61°303. Using the Spearman rank correlation test, we found highly significant correlations between the orbital variability of the equivalent width of the blue hump of the Hα and Fermi-LAT flux with a Spearman p-value ~2 × 10-5, and the equivalent widths ratio EWB/EWR and Fermi-LAT flux with p-value ~9 × 10-5. We also found a significant anti-correlation between Fermi-LAT flux and V band magnitude with a p-value ~7 × 10-4. All these correlations refer to the average orbital variability, and we conclude that the Hα and γ-ray emission processes in LS I + 61°303 are connected. The possible physical scenario is briefly discussed.
Key words: stars: individual: LS I+61°303 / gamma rays: stars / X-rays: binaries / stars: winds, outflows / stars: emission-line, Be
© ESO, 2013
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