Calibrating Stellar Models with the Pleiades: Resolving the Distance Discrepancy-Cycle9

Details Calibrating Stellar Models with the Pleiades: Resolving the Distance Discrepancy-Cycle9 Calibrating Stellar Models with the Pleiades: Resolving the Distance Discrepancy-Cycle9

Jul 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000hst..prop.8777s&link_type=abstract

HST Proposal ID #8777

Computer Science

Hst Proposal Id #8777

Scientific paper

This is the second phase of a multi-year effort to measure an accurate distance to the Pleiades and to resolve the problem raised by the Hipparcos results for this cluster. The Hipparcos distance, taken at face value, indicates that solar-composition ZAMS stars are 30% fainter than previously believed. 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 observed several spectroscopic binary systems with 2 to 3 year orbital periods to assertain our prospects for deriving visual orbits and hence orbital parallaxes for these cluster members. Although the FGS did resolve some of the systems, it became clear that the accuarcies that would result would not be sufficient to either confirm or refute the Hipparcos result. In this phase, we have changed our strategy to use the FGS to directly determine trigonometric parallaxes for 8 {or more} Pleiads. The accuracy of our measured parallaxes, expected to have sigma < 0.3 mas, will be sufficient to resolve the Hipparcos distance discrepency, and will allow us to directly determine the absolute magnitude for the ZAMS stars in our sample without the additional uncertainties introduced by effects of the cluster's depth.

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