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Wind accretion in the massive X-ray binary 4U 2206+54: abnormally slow wind and a moderately eccentric orbit

2006

Massive X-ray binaries are usually classified depending on the properties of the donor star in classical, supergiant and Be X-ray binaries. The massive X-ray binary 4U 2206+54 does not fit in any of these groups, and deserves a detailed study to understand how the transfer of matter and the accretion on to the compact object take place. To this end we study an IUE spectrum of the donor and obtain a wind terminal velocity (v_inf) of ~350 km/s, which is abnormally slow for its spectral type. We also analyse here more than 9 years of available RXTE/ASM data. We study the long-term X-ray variability of the source and find it to be similar to that observed in the wind-fed supergiant system Vela …

4U 2206+54X-ray binaryBinary numberFOS: Physical sciencesOutflows Emission-lineOrbital eccentricityAstrophysicsWindsCompact starUNESCO::ASTRONOMÍA Y ASTROFÍSICAVelaAstrophysicsIndividual starsPhysicsAstrophysics (astro-ph)BD +53◦2790BeAstronomy and AstrophysicsOrbital period:ASTRONOMÍA Y ASTROFÍSICA::Cosmología y cosmogonia [UNESCO]Accretion (astrophysics)X-rays binariesX-rays individualsX-rays binaries ; X-rays individuals ; 4U 2206+54 ; Individual stars ; BD +53◦2790 ; Winds ; Outflows Emission-line ; BeSpace and Planetary ScienceUNESCO::ASTRONOMÍA Y ASTROFÍSICA::Cosmología y cosmogoniaSupergiant:ASTRONOMÍA Y ASTROFÍSICA [UNESCO]
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