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24 April 2024 |
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Article overview
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Echoes from the companion star in Sco X-1 | | T. Muñoz-Darias
; I.G. Martinez-Pais
; J. Casares
; V.S. Dhillon
; T.R. Marsh
; R. Cornelisse
; D. Steeghs
; P.A. Charles
; | | Date: |
31 May 2007 | | Subject: | Astrophysics (astro-ph) | | Abstract: | We present simultaneous X-ray (RXTE) and optical (ULTRACAM) narrow band
(Bowen blend/HeII and nearby continuum) observations of Sco X-1 at 2-10 Hz time
resolution. We find that the Bowen/HeII emission lags the X-ray light-curves
with a light travel time of ~11-16s which is consistent with reprocessing in
the companion star. The echo from the donor is detected at orbital phase ~0.5
when Sco X-1 is at the top of the Flaring Branch. Evidence of echoes is also
seen at the bottom of the Flaring Branch but with time-lags of 5-10s which are
consistent with reprocessing in an accretion disc with a radial temperature
profile. We discuss the implication of our results for the orbital parameters
of Sco X-1. | | Source: | arXiv, arxiv.0705.4568 | | Services: | Forum | Review | PDF | Favorites | |
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