Computer Science
Scientific paper
Jul 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994hst..prop.5510t&link_type=abstract
HST Proposal ID #5510
Computer Science
Hst Proposal Id #5510 Cool Stars
Scientific paper
Stellar masses which lie at or just below the stellar/ sub-stellar boundary are difficult to determine with certainty. Only binary stars with low luminosity members provide masses. In the best studied cases a significant source of uncertainty in the estimated masses is the blending of the light on the photographic plates used to record the stars' positions. The blending must be modelled in order to determine the locus of the center of mass. The position of the center of mass determines the mass ratio. Without knowing this, or the fraction of the total mass of the pair present in each component of the system, the uncertainty resulting from blending provides a point of attack for those who question the reality of ~ 0.05 solar mass estimates and thus not clearly sub-stellar or "brown dwarfs". We plan to resolve the pairs, measure orbital motion for mass ratio and determine individual masses with the help of orbital parameters which are well determined from ground-based work.
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