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The Optical Counterpart of the Accreting Millisecond Pulsar SAX J1808.4-3658 in Outburst: Constraints on the Binary Inclination | | Zhongxiang Wang
; Deepto Chakrabarty
; Paul Roche
; Philip A. Charles
; Erik Kuulkers
; Tariq Shahbaz
; Chris Simpson
; Duncan A. Forbes
; Stephen F. Helsdon
; | | Date: |
30 Oct 2001 | | Subject: | astro-ph | | Affiliation: | MIT), Deepto Chakrabarty (MIT), Paul Roche (Leicester), Philip A. Charles (Southampton), Erik Kuulkers (SRON), Tariq Shahbaz (IAC), Chris Simpson (Subaru), Duncan A. Forbes (Swinburne), Stephen F. Helsdon (Birmingham | | Abstract: | We present multiband optical/infrared photometry of V4580 Sgr, the optical counterpart of the accretion-powered millisecond pulsar SAX J1808.4-3658, taken during the 1998 X-ray outburst of the system. The optical flux is consistent with emission from an X-ray-heated accretion disk. Self-consistent modeling of the X-ray and optical emission during the outburst yields best-fit extinction Av=0.68 and inclination cos(i)=0.65, assuming a distance of 2.5 kpc. The allowed inclination range requires that the pulsar’s stellar companion has extremely low mass, 0.05-0.10 Msun. Some of the infrared observations are not consistent with disk emission and are too bright to be from either the disk or the companion, even in the presence of X-ray heating. | | Source: | arXiv, astro-ph/0110666 | | Services: | Forum | Review | PDF | Favorites | |
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