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| Paper: |
The Hyades Main Sequence from Improved Hipparcos Parallaxes |
| Volume: |
167, Harmonizing Cosmic Distance Scales in a Post-Hipparcos Era |
| Page: |
78 |
| Authors: |
Madsen, Søren |
| Abstract: |
Ultra-precise stellar distances can in some circumstances be derived from Hipparcos parallaxes in combination with proper motions and a kinematical model of the stars. One such case is the Hyades open cluster, where individual parallaxes with a precision of about 0.3 mas have been derived. The improved parallaxes give a Hertzsprung-Russell diagram with a much more well-defined main sequence compared with the original Hipparcos parallaxes. If known binaries are excluded, the HR diagram for the Hyades reveals a very narrow main sequence (RMS spread < 0.07~mag in MHp). |
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