Spectroscopic and photometric studies of white dwarfs in the Hyades

Abstract

The Hyades cluster is known to harbour ten so-called classical white dwarf members. Numerous studies through the years have predicted that more than twice this amount of degenerate stars should be associated with the cluster. Using the PPMXL catalog of proper motions and positions, a recent study proposed 17 new white dwarf candidates. We review the membership of these candidates by using published spectroscopic and photometric observations, as well as by simulating the contamination from field white dwarfs. In addition to the ten classical Hyades white dwarfs, we find six white dwarfs that may be of Hyades origin and three more objects that have an uncertain membership status due to their unknown or imprecise atmospheric parameters. Among those, two to three are expected as field stars contamination. Accurate radial velocity measurements will confirm or reject the candidates. One consequence is that the longstanding problem that no white dwarf older than ~340 Myr appears to be associated with the cluster remains unsolved.

14 pages, 9 figures, accepted for publication in the Astronomy and Astrophysics journal

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• The Hyades Cluster: Identification of a Planetary System and Escaping White Dwarfs
• A Gaia DR2 view of white dwarfs in the Hyades
• Masses of the Hyades white dwarfs: A gravitational redshift measurement
• Ensemble Properties of the White Dwarf Population of the Old, Solar Metallicity Open Star Cluster Messier 67
• An Ultramassive 1.28 M${}_{\odot }$ White Dwarf in NGC 2099
• White dwarf-open cluster associations based on Gaia DR2
• The Initial-Final Mass Relation for Hydrogen-Deficient White Dwarfs
• Uncovering new white dwarf - open cluster associations using Gaia DR3
• Search for giant planets around seven white dwarfs in the Hyades cluster with the Hubble Space Telescope
• Accurate mass-radius ratios for Hyades white dwarfs