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Infrared Spectroscopy of GX 1+4/V2116 Oph: Evidence for a Fast Red Giant Wind? | | Deepto Chakrabarty
; Marten H. van Kerkwijk
; James E. Larkin
; | | Date: |
11 Feb 1998 | | Journal: | ApJL 497 (1998) L39 | | Subject: | astro-ph | | Affiliation: | MIT), Marten H. van Kerkwijk (IoA), James E. Larkin (UCLA | | Abstract: | We present infrared spectroscopy of the low-mass X-ray binary GX 1+4/V2116 Oph. This symbiotic binary consists of a 2-min accretion-powered pulsar and an M5 III red giant. A strong He I 1.083 micron emission line with a pronounced P Cygni profile was observed. From the blue edge of this feature, we infer an outflow velocity of 250(50) km/s. This is an order of magnitude faster than a typical red giant wind, and we suggest that radiation from the accretion disk or the neutron star may contribute to the acceleration of the outflow. We infer a wind mass loss rate of around 10^-6 Msun/yr. Accretion from such a strong stellar wind provides a plausible alternative to Roche lobe overflow for supplying the accretion disk which powers the X-ray source. The H I Paschen beta and He I 1.083 micron lines showed no evidence for the dramatic changes previously reported in some optical lines, and no evidence for pulsations at the 2-min pulsar period. | | Source: | arXiv, astro-ph/9802137 | | Services: | Forum | Review | PDF | Favorites | |
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