Doppler and modulation tomography of XTE J1118+480 in quiescence

Details Doppler and modulation tomography of XTE J1118+480 in quiescence Doppler and modulation tomography of XTE J1118+480 in quiescence

2009-05-11

arxiv.org/abs/0905.1491v1

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

12 pages, 11 figures, submitted for publication in MNRAS

Scientific paper

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 H-Alpha, H-Beta, He I Lambda-5876, and Ca II Lambda-8662, thus verifying the presence of continued mass transfer within the system. The disc is clearly seen in H-Alpha and Ca II Lambda-8662. We image the mass-donor star in narrow absorption lines of Na I Lambda-Lambda-5890, 5896, 8183, 8195 and Ca II Lambda-8662, implying an origin from the secondary itself rather than the interstellar medium. We also detect deviations in the centroid of the double peak of H-Alpha akin to those found by Zurita et al. 2002 suggesting disc eccentricity.

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