Parallaxes of Hyades Cluster Members, Cycle 6 - High

Details Parallaxes of Hyades Cluster Members, Cycle 6 - High Parallaxes of Hyades Cluster Members, Cycle 6 - High

Jul 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996hst..prop.6873j&link_type=abstract

HST Proposal ID #6873

Computer Science

Hst Proposal Id #6873 Stellar Populations

Scientific paper

The goal of this project is to determine trigonometric parall axes for severalHyades cluster members and to define the Population I zero age main sequence.The ZAMS is used to determine the distances to open clusters and to establishthe zero point of the Cepheid Period-Luminosity relationship, which is thefundamental distance indicator in the universe. A secondary g oal of thisproject is to search for new Hyades cluster members which mig ht be as faint atthe 25th magnitude, or M(v)=22. This part of the project will be accomplishedthrough coordinated parallel observations with the WFC to determine propermotions of very faint stars over a one year base line.FGS parallax observations of the thirteen Hyades members should yield an errorin the distance modulus of the Hyades Cluster good to approximately 0.014 mag.This accuracy should be sufficient to eliminate the Hyades as a source of errorin determining the galactic distance scale.

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