Bibcode
Lodieu, N.; Smart, R. L.; Pérez-Garrido, A.; Silvotti, R.
Bibliographical reference
Astronomy and Astrophysics, Volume 623, id.A35, 27 pp.
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3
2019
Journal
Citations
42
Refereed citations
38
Description
Aims: 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. Methods: 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.
Results: We find 1764 objects within 70° radius from the
cluster centre from the Gaia second data release, whose kinematic
properties are consistent with the Hyades. We limit our study to 30 pc
from the cluster centre (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 0.04-2.5 M⊙ 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 640-49+67 Myr.
Conclusions: 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.
Full Table C.1 is only available at the CDS via anonymous ftp to http://cdsarc.u-strasbg.fr
(ftp://130.79.128.5) or via http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/623/A35
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