Computer Science
Scientific paper
Jul 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995hst..prop.6051m&link_type=abstract
HST Proposal ID #6051
Computer Science
Hst Proposal Id #6051 Cool Stars
Scientific paper
We propose to use the Fine Guidance Sensors to measure dynamical masses for the two stars in the pre-main-sequence binary 045251+3016 =GSC2387 535. We have already completed an excellent single-lined spectroscopic orbit, which provides all of the essential orbital elements except inclination angle and mass ratio. We will use the FGS to derive both the apparent relative orbit of the binary {giving the inclination angle} and the absolute orbits of both components {giving the mass ratio}. The predicted brightness difference is less than 1 mag and during Cycles 5-7 the predicted separation is greater than 20 mas, so this experiment is well suited for the FGS. These observations will provide the first dynamical mass measurements for stars on their Hayashi tracks. Furthermore, the completed spectroscopic orbital solution makes this a unique opportunity for such measurements independent of any assumptions about the stars or their distance. These measurements are fundamental tests of pre-main-sequence stellar evolution theory.
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