2012MNRAS.420.3521S

Query : 2012MNRAS.420.3521S

2012MNRAS.420.3521S - Mon. Not. R. Astron. Soc., 420, 3521-3527 (2012/March-2)

Tracing colliding winds in the ultraviolet line orbital variability of gamma-ray binaries.

SZOSTEK A., DUBUS G. and McSWAIN M.V.

Abstract (from CDS):

Gamma-ray binaries emit most of their radiated power beyond ∼ 10 MeV. The non-thermal emission is thought to arise from the interaction of the relativistic wind of a rotation-powered pulsar with the stellar wind of its massive (O or Be) companion star. A powerful pulsar creates an extended cavity, filled with relativistic electrons, in the radiatively driven wind of the massive star. As a result, the observed P Cyg profiles of ultraviolet (UV) resonant lines from the stellar wind should be different from those of single massive stars.

We propose to use UV emission lines to detect and constrain the colliding wind region in gamma-ray binaries. We compute the expected orbital variability of P Cyg profiles depending upon the interaction geometry (set by the ratio of momentum fluxes from the winds) and the line of sight to the system. We predict little or no variability for the case of LS 5039 and PSR B1259-63, in agreement with currently available Hubble Space Telescope (HST) observations of LS 5039. However, variability between superior and inferior conjunction is expected in the case of LS I+61 303.


Abstract Copyright: 2012 The Authors Monthly Notices of the Royal Astronomical Society2012 RAS

Journal keyword(s): line: profiles - stars: winds, outflows - X-rays: binaries

Simbad objects: 5

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Number of rows : 5
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 LS I +61 303 HXB 02 40 31.6644419688 +61 13 45.593918580 11.27 11.61 10.75 10.19 9.55 B0Ve 903 2
2 HD 259440 HXB 06 32 59.2566076656 +05 48 01.160755848 9.17 9.63 9.15     B0pe 256 0
3 1FGL J1018.6-5856 HXB 10 18 55.5875706288 -58 56 45.975246900   13.638 12.683     O6V((f)) 156 0
4 CPD-63 2495 HXB 13 02 47.6544015048 -63 50 08.626970292 10.34 10.72 9.98 10.03   O9.5Ve 852 0
5 V* V479 Sct HXB 18 26 15.0561548880 -14 50 54.247274304 12.02 12.23 11.27 11.04   ON6V((f))z 613 2

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