Optical Spectral Monitoring of XTE J1118+480 in Outburst: Evidence for a Precessing Accretion Disk?

(2) Harvard-Smithsonian Center for Astrophysics; (3) University of Notre Dame); A. Mahdavi (2)((1)University College; Cork; Ireland; J. E. McClintock (2); M. A. P. Torres (1); M. Calkins (2); M. R. Garcia (2); P. Berlind (2)

arxiv: astro-ph/0112462 · v1 · submitted 2001-12-19 · 🌌 astro-ph

Optical Spectral Monitoring of XTE J1118+480 in Outburst: Evidence for a Precessing Accretion Disk?

M. A. P. Torres (1) , P. J. Callanan (1) , M. R. Garcia (2) , J. E. McClintock (2) , P. Garnavich (3) , Z. Balog (2) , P. Berlind (2) , W. R. Brown (2)

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M. Calkins (2) A. Mahdavi (2)((1)University College Cork Ireland (2) Harvard-Smithsonian Center for Astrophysics (3) University of Notre Dame)

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keywords diskevidencej1118lineopticaloutburstprecessingaccretion

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We present spectroscopic observations of the X-ray transient XTE J1118+480 acquired during different epochs following the 2000 March outburst. We find that the emission line profiles show variations in their double-peak structure on time scales longer than the 4.1 hr orbital period. We suggest that these changes are due to a tidally driven precessing disk. Doppler imaging of the more intense Balmer lines and the HeII 4686 line shows evidence of a persistent region of enhanced intensity superposed on the disk which is probably associated with the gas stream, the hotspot or both. We discuss the possible origins of the optical flux in the system and conclude that it may be due to a viscously heated disk.

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Optical Spectral Monitoring of XTE J1118+480 in Outburst: Evidence for a Precessing Accretion Disk?

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