Other
Scientific paper
Dec 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997hst..prop.7735w&link_type=abstract
HST Proposal ID #7735
Other
Hst Proposal Id #7735 Cool Stars
Scientific paper
The solar atmosphere is composed of structures on scales of the solar radius down to smaller than we can resolve. Presumably, such a wealth of detail exists on other stars, but it is difficult to observe directly. It is important to observe the scale and filling factor of this structure to determine the heating rate and energy balance in the magnetic active regions. We propose to use the passage of the DA white dwarf in the V471 Tau system behind the atmosphere of the K star to probe the atmospheric structure of the active K2 dwarf star. The atmosphere on the line of sight to the DA white dwarf will be observed in absorption; variations in the equivalent widths of the transition region {C IV, Si IV} and chromospheric {O I, C II} lines will yield the run of temperature and density with height integrated along this line of sight. We will use the STISD in time-tagged mode to obtain the best possible time resolution. The white dwarf traverses the distance of its own radius {7*10^8 cm} in 30 seconds, and the radius of the K star in 24 minutes. We will be able to resolve structures on spatial scales down to 2% of the K dwarf radius. Finally, we will study the 555 s rotation of the white dwarf, and use the edge of the K dwarf as a knife-edge during the partial eclipse phases to study the surface brightness variations of the white dwarf.
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