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The Problem Of Hipparcos Distances To Open Clusters. Ii. Constraints From Nearby Field Stars, David R. Soderblom, Jeremy R. King, Robert B. Hanson, Burton F. Jones, Debra Fischer, John R. Stauffer, Marc H. Pisonneault
The Problem Of Hipparcos Distances To Open Clusters. Ii. Constraints From Nearby Field Stars, David R. Soderblom, Jeremy R. King, Robert B. Hanson, Burton F. Jones, Debra Fischer, John R. Stauffer, Marc H. Pisonneault
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This paper examines the discrepancy between distances to nearby open clusters as determined by parallaxes from Hipparcos compared to traditional main-sequence fitting. The biggest difference is seen for the Pleiades, and our hypothesis is that if the Hipparcos distance to the Pleiades is correct, then similar subluminous zero-age main-sequence (ZAMS) stars should exist elsewhere, including in the immediate solar neighborhood. We examine a color-magnitude diagram of very young and nearby solar-type stars and show that none of them lie below the traditional ZAMS, despite the fact that the Hipparcos Pleiades parallax would place its members 0.3 mag below that ZAMS. …
Hd 98800: A Unique Stellar System Of Post-T Tauri Stars, David Soderblom, Jeremy R. King, Lionell Siess, Keith S. Noll, Diane M. Gilmore, Todd J. Henry, Edmund Nelan, Christopher J. Burrows, Robert A. Brown, M.A.C. Perryman
Hd 98800: A Unique Stellar System Of Post-T Tauri Stars, David Soderblom, Jeremy R. King, Lionell Siess, Keith S. Noll, Diane M. Gilmore, Todd J. Henry, Edmund Nelan, Christopher J. Burrows, Robert A. Brown, M.A.C. Perryman
Publications
HD 98800 is a system of four stars, and it has a large infrared excess that is thought to be due to a dust disk within the system. In this paper we present new astrometric observations made with Hipparcos, as well as photometry from Hubble Space Telescope WFPC2 images. Combining these observations and reanalyzing previous work allow us to estimate the age and masses of the stars in the system. Uncertainty in these ages and masses results from uncertainty in the temperatures of the stars and any reddening they may have. We find that HD 98800 is most probably about …