FUSE Observations of RX J0513.9-6951

J. B. Hutchings; A. P. Cowley; R. Mann; P. C. Schmidtke; D. Crampton

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FUSE Observations of RX J0513.9-6951

J. B. Hutchings·A. P. Cowley·R. Mann·P. C. Schmidtke·D. Crampton

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Abstract

FUSE observations were obtained in July 2003 during 1.2 cycles of the 0.76-day binary orbit of RX J0513.9-6951. Radial velocity measurements of the broad O VI emission profile show a semiamplitude of K~26 km/sec, which is much smaller than the value of 117 km/sec measured from 2001 FUSE data. Narrow O VI emissions show no measurable velocity variation. The mean velocity of the broad O VI emission is red-shifted by ~500 km/sec with respect to both the systemic and narrow emission-line velocities. Spectral difference plots show phase-related changes in the broad emission profile. Other phase-related changes such as line and continuum variations are also smaller than in the 2001 spectra. We describe a moving broad absorption feature near 1020A as possible O VI outflow associated with a precessing jet. We discuss the implications for the stellar masses if the 2003 broad O VI velocities outline the compact star's orbital motion.

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J. B. Hutchings, A. P. Cowley, R. Mann, P. C. Schmidtke, D. Crampton. 2005-03-18. FUSE Observations of RX J0513.9-6951. https://arxiv.org/abs/astro-ph/0503417

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