Probing small scale structure in the atmosphere of V471 Tauri

Details Probing small scale structure in the atmosphere of V471 Tauri Probing small scale structure in the atmosphere of V471 Tauri

Mar 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004an....325..241w&link_type=abstract

Astronomische Nachrichten, Vol.325, Issue 3, p.241-244

Astronomy and Astrophysics

Astronomy

5

Stars: Atmospheres, Binaries: Eclipsing, Stars: Chromospheres, Stars: Individual (V471 Tauri)

Scientific paper

The white dwarf in the eclipsing binary system V471 Tau is viewed through the atmosphere of the active K star prior to ingress and after egress. In the far UV the surface brightness of the hot white dwarf far outshines the K star emission. We can use this to probe the structure of the extended K star atmosphere along one line of sight, in absorption, on spatial scales of the radius of the white dwarf (10,000 km). The time series of HST/STIS spectra which show a hot (>250,000K) extended (> 1 K star radius) atmosphere around the K star. We see discrete structures in the velocity-resolved spectra, on spatial scales of less than 100,000 km. The mean velocity is that expected of gas in co-rotation with the K star, but the discrete velocity structures have excursions of up to 70 km/s from the mean. The mean temperature seems to increase with height above the K star photosphere.

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