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The Distances to Open Clusters from Main-Sequence Fitting. I. New Models and a Comparison with the Properties of the Hyades Eclipsing Binary VB 22

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dc.creator Pinsonneault, Marc H.
dc.creator Terndrup, Donald M.
dc.creator Hanson, Robert B.
dc.creator Stauffer, John R.
dc.date.accessioned 2011-03-15T19:25:54Z
dc.date.available 2011-03-15T19:25:54Z
dc.date.issued 2003-11-20
dc.identifier.citation Marc H. Pinsonneault et al, "The Distances to Open Clusters from Main-Sequence Fitting. I. New Models and a Comparison with the Properties of the Hyades Eclipsing Binary VB 22," The Astrophysical Journal 598, no. 1 (2003), doi:10.1086/378854 en_US
dc.identifier.issn 1538-4357
dc.identifier.uri http://hdl.handle.net/1811/48290
dc.description.abstract In the first of a new series of papers on open cluster distances, we use updated stellar evolution models to construct an isochrone appropriate for the Hyades and compare it with the Hyades eclipsing binary system VB 22. We find that the absolute and relative luminosities of the two stars are in good agreement with the model but that the radii do not match the values inferred from eclipse data. We present evidence that there is a consistency problem with the flux ratios and the inferred radii and discuss possible theoretical effects that could be responsible for the mismatch in the radii. We derive a helium abundance for the Hyades of Y = 0.271 ± 0.006, which is equal within the errors to the Sun's initial helium abundance, even though the Hyades is considerably more metal-rich. en_US
dc.language.iso en_US en_US
dc.publisher American Astronomical Society en_US
dc.subject binaries: eclipsing en_US
dc.subject open clusters and associations: individual (Hyades) en_US
dc.subject stars: abundances en_US
dc.subject stars: distances en_US
dc.title The Distances to Open Clusters from Main-Sequence Fitting. I. New Models and a Comparison with the Properties of the Hyades Eclipsing Binary VB 22 en_US
dc.type Article en_US
dc.identifier.doi 10.1086/378854
dc.identifier.osuauthor pinsonneault.1
dc.identifier.osuauthor terndrup.1