The Distance to the Pleiades

Details The Distance to the Pleiades The Distance to the Pleiades

Jul 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003hst..prop.9789j&link_type=abstract

HST Proposal ID #9789

Astronomy and Astrophysics

Astrophysics

Hst Proposal Id #9789 Stellar Populations

Scientific paper

Despite its fundamental importance to stellar astrophysics, the distance to the Pleiades open cluster remains in great dispute. Main-sequence fitting results in a distance of 132.3 +/- 1.9 pc, while the Hipparcos average parallax for Pleaides member stars gives a distance of 116.4 +/- 2.9 pc. If the Hipparcos distance is to be believed, our current understanding of stellar astrophysics is dramatically incomplete. On the other hand, it has been proposed that the Hipparcos parallax measurement to the Pleiades suffers systematic uncertainties which result in the discrepancy with the main-sequence fitting technique. The question will remain open until an independent distance measurement to the Pleiades cluster is performed. We will use ACS imaging to determine the parallax to the Pleiades to an accuracy of about 1.5%. This will resolve the current controversy over the distance to the cluster once and for all.

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