J/MNRAS/520/6245 Dynamical age Tucana-Horologium (Galli+, 2023)
Dynamical age of the Tucana-Horologium young stellar association.
Galli P.A.B., Miret-Roig N., Bouy H., Olivares J., Barrado D.
<Mon. Not. R. Astron. Soc. 520, 6245-6255 (2023)>
=2023MNRAS.520.6245G 2023MNRAS.520.6245G (SIMBAD/NED BibCode)
ADC_Keywords: Clusters, open ; Stars, nearby ; Radial velocities ;
Proper motions ; Parallaxes, trigonometric ; Optical
Keywords: stars: formation - stars: kinematics and dynamics -
Galaxy: kinematics and dynamics -
open clusters and associations: individual: Tucana-Horologium -
solar neighbourhood
Abstract:
The Tucana-Horologium association is one of the closest young stellar
groups to the Sun and despite the close proximity its age is still
debated in the literature. We take advantage of the state-of-the-art
astrometry delivered by the third data release of the Gaia space
mission combined with precise radial velocity measurements obtained
from high-resolution spectroscopy to investigate the dynamical age of
the association. We perform an extensive traceback analysis using a
combination of different samples of cluster members, metrics to
evaluate the minimum size of the association in the past and models
for the galactic potential to integrate the stellar orbits back in
time. The dynamical age of 38.5+1.6-8.0Myr that we derive in this
paper is consistent with the various age estimates obtained from
isochrone fitting in the literature (30-50Myr) and reconciles, for
the first time, the dynamical age of the Tucana-Horologium association
with the age obtained from lithium depletion (∼40Myr). Our results are
independent from stellar models and represent one more step towards
constructing a self-consistent age scale for the young stellar groups
of the Solar neighbourhood based on the 3D space motion of the stars.
Description:
Properties of the Tucana-Horologium stars and radial velocities
derived in this study.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tablea2.dat 126 90 Properties of Tuc-Hor stars
tablea1.dat 101 496 Radial velocities derived in this paper
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See also:
I/355 : Gaia DR3 Part 1. Main source (Gaia Collaboration, 2022)
Byte-by-byte Description of file: tablea2.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 7 A7 --- --- [GaiaDR3]
8- 26 I19 --- GaiaDR3 Source identifier from Gaia-DR3 catalogue
28- 39 F12.8 deg RAdeg Right ascension (ICRS) at Ep=2016.0
41- 51 F11.7 deg DEdeg Declination (ICRS) at Ep=2016.0
53- 59 F7.3 mas/yr pmRA Proper motion in right ascension
61- 65 F5.3 mas/yr e_pmRA Proper motion uncertainty in right ascension
67- 73 F7.3 mas/yr pmDE Proper motion in declination
75- 79 F5.3 mas/yr e_pmDE Proper motion uncertainty in declination
81- 86 F6.3 mas plx Parallax
88- 92 F5.3 mas e_plx Parallax uncertainty
94- 98 F5.2 km/s RV1 ?=- Radial velocity (Gaia-DR3)
100-104 F5.2 km/s e_RV1 ?=- Radial velocity uncertainty (Gaia-DR3)
108-112 F5.2 km/s RV2 ?=- Radial velocity (this work)
115-118 F4.2 km/s e_RV2 ?=- Radial velocity uncertainty (this work)
120 A1 --- Flag1 [01] Binary flag (0=single; 1=binary) (G1)
122 A1 --- Flag2 [01] Sample flag (0=rejected; 1=accepted) (G2)
124 A1 --- Flag3 [01] Control sample 1
(0=rejected; 1=accepted) (G2)
126 A1 --- Flag4 [01] Control sample 2
(0=rejected; 1=accepted) (G2)
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Byte-by-byte Description of file: tablea1.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 7 A7 --- --- [GaiaDR3]
8- 26 I19 --- GaiaDR3 Source identifier from Gaia-DR3 catalogue
28- 39 F12.8 deg RAdeg Right ascension (ICRS) at Ep=2016.0
41- 51 F11.7 deg DEdeg Declination (ICRS) at Ep=2016.0
53- 59 F7.1 d MJD Modified Julian date
63- 67 F5.2 km/s RV Radial velocity
69- 72 F4.2 km/s e_RV Radial velocity uncertainty
74- 77 F4.2 km/s s_RV Radial velocity scatter
79- 81 I3 --- SNR Signal-to-noise of the spectrum
83- 93 A11 --- PID Programme identifier
95- 99 A5 --- Inst Instrument
101 A1 --- Flag [01] Binary flag (0=single; 1=binary) (G1)
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Global notes:
Note (G1): Flag as follows:
0 = single
1 = binary
Note (G2): Flag as follows:
0 = rejected
1 = accepted
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Acknowledgements:
Phillip Galli, phillip.ab.galli(at)gmail.com
History:
06-Mar-2023: on-line version
10-Jun-2024: in table A2, explanations of RV1 and RV2 where interverted,
now correct.
(End) Phillip Galli [NAT, Brazil], Patricia Vannier [CDS] 23-Feb-2023