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A Combined Astrometric and Spectroscopic Study of Metal-Poor Binaries

Sozzetti, A.; Santos, N. C.; Latham, D. W. +1 more

In this work we present a study of binary systems in a metal-poor sample of solar type stars. The stars analyzed were rejected from two planet search samples because they were found to be binaries. Using available radial velocity and Hipparcos astrometric data, we apply different methods to find, for every binary system, a possible range of soluti…

Nitrogen Abundances and the Distance Moduli of the Pleiades and Hyades

King, Jeremy R.; Boesgaard, Ann M.; Chen, Yu +1 more

Recent reanalyses of HIPPARCOS parallax data confirm a previously noted discrepancy with the Pleiades distance modulus estimated from main-sequence fitting in the color-magnitude diagram. One proposed explanation of this distance modulus discrepancy is a Pleiades He abundance that is significantly larger than the Hyades value. We suggest that, bas…