Physics
Scientific paper
Jul 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995hst..prop.6062s&link_type=abstract
HST Proposal ID #6062
Physics
Hst Proposal Id #6062 Cool Stars
Scientific paper
HD 98800 is a nearby K star (possibly a dwarf at about 12 pc or maybe a pre-main sequence star at 30 to 35 pc) that is extraordinary because at least 10 reradiated in the infrared. Basic geometry tells us that that material must form a very thick disk, yet such disks collapse very quickly. How then is the disk's thickness maintained? What kind of star is HD 98800? More precisely, what kind of stars are HD 98800, for there are, in fact, two visible objects, and each of these is a spectroscopic binary. How did this system, which is probably very young, come to be in the immediate solar neighborhood? This proposal seeks HST observations to address the fundamental questions about disk formation, maintenance, and dynamics that the infrared observations of HD 98800 raise. The FGSs will be used to determine parallaxes for both objects. That will unambiguously confirm or deny that the two visible objects are physically related and will provide luminosities for both of them, thereby establishing evolutionary status. The GHRS will be used to obtain spectra of both visible objects to gain supporting evidence for their physical association by looking at the strength of Mg ii 2800 Angstrom emission. Finally, WFPC2 will be used to attempt to directly image the disk itself.
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