Two Boehm-Vitense gaps in the main sequence of the Hyades

Details Two Boehm-Vitense gaps in the main sequence of the Hyades Two Boehm-Vitense gaps in the main sequence of the Hyades

2000-11-08

arxiv.org/abs/astro-ph/0011162v1

Astronomy and Astrophysics

Astrophysics

4 pages, 2 PostScript figures, LaTeX using aastex and emulateapj5.sty; accepted for publication in Astrophysical Journal Lette

Scientific paper

10.1086/317296

Hipparcos proper motions and trigonometric parallaxes allow the derivation of secular parallaxes which fix the distances to individual stars in the Hyades cluster to an accuracy of \sim 2 percent. The resulting color-absolute magnitude diagram for 92 high-fidelity single members of the cluster displays a very narrow main sequence, with two turn-offs and associated gaps. These occur at the locations where the onset of surface convection affects the B-V colors, as predicted by Boehm-Vitense thirty years ago. The new distances provide stringent constraints on the transformations of colors and absolute magnitudes to effective temperatures and luminosities, and on models of stellar interiors.

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