Calibrating Stellar Models with the Pleiades: Resolving the Distance Discrepancy

Details Calibrating Stellar Models with the Pleiades: Resolving the Distance Discrepancy Calibrating Stellar Models with the Pleiades: Resolving the Distance Discrepancy

Jul 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999hst..prop.8335s&link_type=abstract

HST Proposal ID #8335

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Hst Proposal Id #8335 Cool Stars

Scientific paper

This is the first phase of a multi-year effort to measure true masses for low-mass dwarfs in the Pleiades and to determine an accurate distance to this fundamental cluster. The goals are: 1} To determine the true distance to the Pleiades to resolve the problem raised by the Hipparcos results for this cluster; The Hipparcos distance for the Pleiades, taken at face value, indicates that solar-composition ZAMS stars are 30% fainter than previously believed. 2} To test ZAMS models of evolution for young solar-type stars by measuring masses of individual stars. 3} To construct a mass-luminosity relation for young low-mass stars with solar composition. The resolution to the Hipparcos distance problem is vital for understanding all the parallaxes that have come from that mission and hence this issue is fundamental to the cosmic distance scale. In this first phase we get several observations of three systems which are already resolved spectroscopically and which have 2 to 3 year orb ital periods, and we examine other Pleiades binaries to ascertain which objects are resolvable pairs with separations suitable for orbit determinations with the FGS. Please note: Most of our targets are bright and near each other, and can therefore be surveyed in TRANS mode in 1/2 an orbit each. Our total orbit request reflects this.

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