J/A+A/623/A35 A 3D view of the Hyades population (Lodieu+, 2019)
A 3D view of the Hyades stellar and sub-stellar population.
Lodieu N., Smart R.L., Perez-Garrido A., Silvotti R.
<Astron. Astrophys. 623, A35 (2019)>
=2019A&A...623A..35L 2019A&A...623A..35L (SIMBAD/NED BibCode)
ADC_Keywords: Clusters, open ; Populations, stellar ; Stars, distances
Keywords: stars: low-mass - brown dwarfs - surveys -
open clusters and association: Hyades - astrometry
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 30pc from the
cluster center (47.03±0.20pc) 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 2.5M☉ 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+67-49Myr.
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.
Description:
Catalogue of all 1764 candidate members of the Hyades cluster with a
velocity consistent with the mean 3D motion of the Hyades and located
within a radius of 70 degree from the cluster center.
We have 710 Hyades members within the core of the cluster (3.1pc)
We have 381 Hyades members within the tidal radius (9pc)
We have 85 Hyades members within 30pc from the cluster center.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tablec1.dat 155 1764 Members of the Hyades cluster
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See also:
I/345 : Gaia DR2 (Gaia Collaboration, 2018)
J/A+A/243/386 : Hyades members distances (Schwan 1991)
J/A+A/331/81 : Hyades membership (Perryman+ 1998)
J/A+A/367/111 : A Hipparcos study of the Hyades cluster (de Bruijne+, 2001)
J/A+A/621/L2 : Hyades tidal tails revealed by Gaia DR2 (Roeser+, 2019)
J/A+A/621/L3 : Hyades tidal tails with Gaia DR2 (Meingast+, 2019)
Byte-by-byte Description of file: tablec1.dat
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Bytes Format Units Label Explanations
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1- 19 I19 --- ID Gaia DR2 SourceID
21- 36 F16.12 deg RAdeg Gaia DR2 Right ascension
(ICRS, at epoch 2015.5)
38- 53 F16.12 deg DEdeg Gaia DR2 Declination (ICRS, at epoch 2015.5)
55- 63 F9.4 mas/yr pmRA* Gaia DR2 Proper motion in Right Ascension,
pmRA*cosDE
65- 73 F9.4 mas/yr pmDE Gaia DR2 Proper motion in Declination
75- 82 F8.4 mas Plx Gaia DR2 parallax
84- 90 F7.4 mag Gmag Gaia DR2 G magnitude
92-100 F9.3 pc bx bx galactic coordinate
102-110 F9.3 pc by by galactic coordinate
112-120 F9.3 pc bz bz galactic coordinate
122-130 F9.3 pc Dist Distance from the cluster center
132-137 F6.3 --- c Confidence region parameter
139-144 F6.4 Msun Mass Mass in solar mass
147-155 F9.6 km/s RV ?=- Gaia DR2 radial velocity
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Acknowledgements:
Nicolas Lodieu, nlodieu(at)iac.es
(End) Nicolas Lodieu [IAC, Tenerife, Spain], Patricia Vannier [CDS] 16-Jan-2019