TL;DR
This study uses Gaia and Hipparcos data to identify Hyades cluster members, improve their parallaxes through kinematic modeling, and analyze the cluster's structure and stellar properties with high precision.
Contribution
It introduces an extended kinematic membership method supporting stars with and without radial velocities, providing more accurate parallaxes and detailed cluster analysis.
Findings
Identified 251 candidate members, including 70 new candidates.
Derived parallaxes more precise than previous Gaia/Hipparcos data.
Revealed detailed structure of the cluster's main sequence and binary population.
Abstract
We present a study of the membership of the Hyades open cluster, derive kinematically-modelled parallaxes of its members, and study the colour-absolute magnitude diagram of the cluster. We use Gaia DR1 Tycho-Gaia Astrometric Solution (TGAS) data complemented by Hipparcos-2 data for bright stars not contained in TGAS. We supplement the astrometric data with radial velocities collected from a dozen literature sources. By assuming that all cluster members move with the mean cluster velocity to within the velocity dispersion, we use the observed and the expected motions of the stars to determine individual cluster membership probabilities. We subsequently derive improved parallaxes through maximum-likelihood kinematic modelling of the cluster. This method has an iterative component to deal with 'outliers', caused for instance by double stars or escaping members. Our method extends an…
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