Parallaxes of Hyades Cluster Members, Cycle 5-PART2

Details Parallaxes of Hyades Cluster Members, Cycle 5-PART2 Parallaxes of Hyades Cluster Members, Cycle 5-PART2

Jul 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995hst..prop.6158j&link_type=abstract

HST Proposal ID #6158

Astronomy and Astrophysics

Astronomy

Hst Proposal Id #6158 Stellar Populations, Astrometry

Scientific paper

The goal of this project is to determine trigonometric parallaxes for several Hyades 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 establish the zero point of the Cepheid Period-Luminosity relationship, which is the fundamental distance indicator in the universe. A secondary goal of this project is to search for new Hyades cluster members which might be as faint at the 25th magnitude, or M{v}=22. This part of the project will be accomplished through coordinated parallel observations with the WFC to determine proper motions of very faint stars over a one year base line. FGS parallax observations of the thirteen Hyades members should yield an error in 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 error in determining the galactic distance scale.

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