Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001hst..prop.9183s&link_type=abstract
HST Proposal ID #9183
Astronomy and Astrophysics
Astronomy
Hst Proposal Id #9183 Cold Stars
Scientific paper
During the past two cycles we have pushed the limits of the FGSs to resolve a visual binary that is part of the closest system of pre-main sequence stars: HD 98800. The system is 50 pc away and this binary has a period just under a year, meaning the separation is about 20 milliarcsec. The two stars have similar brightnesses. The goal is to determine an astrometric orbit which, when combined with radial velocity observations, leads to the first dynamically-determined masses for low-mass pre-main sequence stars. We have succeeded in resolving the pair of stars with FGS1R, but not at all points in the orbit. Now that we have some FGS data in hand, we know the orbit well enough to fill in the missing pieces. With a full data set we can determine the stellar masses to within about 5 FGS1R can resolve the Ba-Bb pair and can determine the relative orbit and luminosities for the two components. In this program we propose to complete the orbit solution for the HD 98800 Ba-Bb pair by obtaining five visits near apastron.
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