Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004iaus..219..233w&link_type=abstract
Stars as suns : activity, evolution and planets, Proceedings of the 219th symposium of the International Astronomical Union held
Astronomy and Astrophysics
Astronomy
Scientific paper
X-ray UV and optical observations have shown that the K2V-dA binary V471 Tau has an extended atmosphere. By using the dA white dwarf as a probe we can observe the atmosphere along the line of sight to the hot white dwarf with a spatial resolution of less than 10000 km. We observe absorption lines of transition region species including Si III Si IV C IV and N V in absorption against the white dwarf photospheric continuum. The velocities are those of gas in co-rotation with the K star and not the gravitationally redshifted surface of the white dwarf. I will summarize the extent temperature and spatial and spectral variability of the atmosphere as observed with the HST/STIS.
I will present preliminary results from our simultaneous CHANDRA/LETG and HST/STIS observations obtained in January 2002.
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