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

M. A. P. Torres | Zendy; P. J. Callanan | Zendy; M. R. Garcia | Zendy; J. E. McClintock | Zendy; P. Garnavich | Zendy; Z. Balog | Zendy; P. Berlind | Zendy; Warren R. Brown | Zendy; M. Calkins | Zendy; Andisheh Mahdavi | Zendy

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

Author(s) -

M. A. P. Torres,

P. J. Callanan,

M. R. Garcia,

J. E. McClintock,

P. Garnavich,

Z. Balog,

P. Berlind,

Warren R. Brown,

M. Calkins,

Andisheh Mahdavi

Publication year - 2002

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/339282

Subject(s) - balmer series , astrophysics , physics , accretion disc , line (geometry) , flux (metallurgy) , accretion (finance) , astronomy , emission spectrum , precession , spectral line , geometry , materials science , mathematics , metallurgy

We present spectroscopic observations of the X-ray transient XTE J1118+480acquired during different epochs following the 2000 March outburst. We findthat the emission line profiles show variations in their double-peak structureon time scales longer than the 4.1 hr orbital period. We suggest that thesechanges are due to a tidally driven precessing disk. Doppler imaging of themore intense Balmer lines and the HeII 4686 line shows evidence of a persistentregion of enhanced intensity superposed on the disk which is probablyassociated with the gas stream, the hotspot or both. We discuss the possibleorigins of the optical flux in the system and conclude that it may be due to aviscously heated disk.Comment: 15 pages, 8 figures, accepted by Ap

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