A 3D view of the Hyades stellar and sub-stellar population
Journal
ASTRONOMY & ASTROPHYSICS
Date Issued
2019
Author(s)
DOI
10.1051/0004-6361/201834045
Abstract
Our scientific goal is to provide a 3D map of the nearest open cluster to the
Sun, the Hyades, combining the recent release of Gaia astrometric data,
ground-based parallaxes of sub-stellar member candidates and photometric data
from surveys which cover large areas of the cluster.
We combined the second Gaia release with ground-based H-band parallaxes
obtained with the infrared camera on the 2-m robotic Liverpool telescope to
astrometrically identify stellar and sub-stellar members of the Hyades, the
nearest open cluster to the Sun.
We find 1764 objects within 70 degree radius from the cluster center from the
Gaia second data release, whose kinematic properties are consistent with the
Hyades. We limit our study to 30 pc from the cluster center (47.03+/-0.20 pc)
where we identify 710 candidate members, including 85 and 385 in the core and
tidal radius, respectively. We determine proper motions and parallaxes of eight
candidate brown dwarf members and confirm their membership. Using the 3D
positions and a model-based mass-luminosity relation we derive a luminosity and
mass function in the 0.04 to 2.5 Msun range. We confirm evidence for mass
segregation in the Hyades and find a dearth of brown dwarfs in the core of the
cluster. From the white dwarf members we estimate an age of 640$^{+67}_{-49}$
Myr.
We identify a list of members in the Hyades cluster from the most massive
stars down to the brown dwarfs. We produce for the first time a 3D map of the
Hyades cluster in the stellar and sub-stellar regimes and make available the
list of candidate members.
Volume
623
Start page
A35
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