Astronomy and Astrophysics – Astrophysics
Scientific paper
2003-07-31
Astrophys.J.600:946-959,2004
Astronomy and Astrophysics
Astrophysics
Accepted for publication in Astrophysical Journal
Scientific paper
10.1086/379925
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 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 \pm 0.006, which is equal within the errors to the Sun's initial helium abundance even though the Hyades is considerably more metal-rich.
Hanson Robert B.
Pinsonneault Marc H.
Stauffer Joh R.
Terndrup Donald M.
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