Mathematics – Logic
Scientific paper
Jul 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995hst..prop.6072d&link_type=abstract
HST Proposal ID #6072
Mathematics
Logic
Hst Proposal Id #6072 Cool Stars
Scientific paper
We will exploit the unique properties of the GHRS and push thelimits of stellar imaging to its next logical point byobtaining 2-D images of a late-type star in consecutiveatmospheric layers. We propose to observe V824 Ara (HD155555)at Mg II and C IV wavelengths over one complete rotation inorder to construct 2-D maps of the uneven heating distributionin the chromosphere. We also plan to map the corona byobserving the Fe XXI 1356Angstrom line. Fe XXI observationsof targets like V824 Ara with adequate S/N for mapping werenot possible prior to the servicing mission. Combined withground based optical and radio observations we will be ableto, for the first time, obtain a comprehensive 2-D map of thephotosphere, chromosphere and corona of V824 Ara at a singleepoch. The GHRS will be used in rapid mode during the Fe XXIobservations in order to temporally resolve any flares thatmight be observed while at the same time allowing us to removesuch transients from our imaging data. Since the target lieswithin HST's CVZ we will be able to obtain excellent phaseresolution, and hence spatial resolution, while using thetelescope in an extremely efficient fashion.
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