Doppler and modulation tomography of XTE J 1118 + 480 in quiescence


We present Doppler and modulation tomography of the X-ray nova XTE J1118+480 with data obtained during quiescence using the 10-m Keck II telescope. The hot spot where the gas stream hits the accretion disc is seen in Hα, Hβ, He i λ5876, and Ca ii λ8662, thus verifying the presence of continued mass transfer within the system. The disc is clearly seen in Hα and Ca ii λ8662. We image the mass-donor star in narrow absorption lines of Na I λλ5890, 5896, 8183, 8195 and Ca ii λ8662, implying an origin from the secondary itself rather than the interstellar medium. We also detect deviations in the centroid of the double peak of Hα akin to those found by Zurita et al. 2002 suggesting disc eccentricity.

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@inproceedings{Calvelo2009DopplerAM, title={Doppler and modulation tomography of XTE J 1118 + 480 in quiescence}, author={Daniel Calvelo and S . D . Vrtilek and D . Steeghs and M . A . P{\'e}rez - Torres and Joseph Neilsen and Alexei V . Filippenko and Jonay I . Gonz{\'a}lez Hern{\'a}ndez}, year={2009} }