J/A+A/699/A122 Local young stellar associations (Olivares+, 2025)
Bayesian ages of local young stellar associations.
I. Through the expansion rate method.
Olivares J., Miret-Roig N., Galli P.A.B., Bouy H.
<Astron. Astrophys. 699, A122 (2025)>
=2025A&A...699A.122O 2025A&A...699A.122O (SIMBAD/NED BibCode)
ADC_Keywords: Associations, stellar ; Parallaxes, trigonometric ;
Positional data ; Space velocities
Keywords: methods: statistical - open clusters and associations: general -
solar neighborhood
Abstract:
Local young stellar associations (LYSAs <50Myr and <150pc) are
important laboratories to test predictions from star formation
theories. Estimating their ages through various dating techniques with
minimal biases is thus of paramount importance. Aims. We aim to
determine the ages of LYSAs with the expansion rate dating technique.
We estimated the ages of the LYSAs using literature membership lists,
publicly available data (astrometry and radial velocities), and a
recent open-source Bayesian code that implements the expansion rate
method. This code in combination with simple statistical assumptions
allowed us to decontaminate, identify possible substructures or
populations, and estimate expansion ages.
We derive the largest and most methodological homogeneous set of ages
of LYSAs. We rediscover three and discover four associations hidden
within the literature membership lists of the classical ones.
The expansion ages we report here are compatible with literature age
estimates. Moreover, our analysis shows that previous age tensions can
be explained, in most cases, by the presence of unidentified
populations or substructures.
Description:
The following tables contain the phase-space parameters inferred for
each stellar association using the linear velocity field model given
the Gaia DR3 data of different literature membership lists that were
cleaned using phase-space methods. The parameters were inferred in the
Galactic coordinate system. They include the phase-space coordinates
(loc[]), dispersion or size (std[]), correlations in position and in
velocity (corr-pos or corr-vel). The units of these parameters are pc
and km/s, for XYZ and UVW, respectively. The parameters of the linear
velocity field are also reported. These are all in units of meters per
second per pc (m.s-1.pc-1) and comprise: kappa, which is the mean
value of all three components of the expansion rate, these three
components of the expansion, omega, which is the norm of the omega
vector, the three components of the omega vector, and the five entries
of W. For more details of the definition of these parameters, see Sec.
3.3 of Lindegren et al. (2000A&A...356.1119L 2000A&A...356.1119L). The second table
contains the Gaia DR3 source identifiers of the cleaned membership
list as well as the source origin of the spectroscopic radial
velocity.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tableb2.dat 412 420 Parameters inferred for each stellar association
tableb3.dat 57 7390 List of members for each stellar association
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See also:
I/355 : Gaia DR3 Part 1. Main source (Gaia Collaboration, 2022)
Byte-by-byte Description of file: tableb2.dat
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Bytes Format Units Label Explanations
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1- 11 A11 --- Assoc Abbreviated name of the association
13- 28 A16 --- Memb Abbreviated name of the membership list (G1)
30- 37 A8 --- RVori Abbreviated name of the RV origin
39- 47 A9 --- Stat Name of the statistic estimator
49- 58 F10.5 pc loc[X] Galactic coordinate X
60- 69 F10.5 pc loc[Y] Galactic coordinate Y
71- 79 F9.5 pc loc[Z] Galactic coordinate Z
81- 89 F9.5 km/s loc[U] Galactic velocity U
91- 99 F9.5 km/s loc[V] Galactic velocity V
101-109 F9.5 km/s loc[W] Galactic velocity W
111-118 F8.5 pc stdloc[X] Dispersion of coordinate X
120-127 F8.5 pc stdloc[Y] Dispersion of coordinate Y
129-136 F8.5 pc stdloc[Z] Dispersion of coordinate Z
138-144 F7.5 km/s stdloc[U] Dispersion of velocity U
146-152 F7.5 km/s stdloc[V] Dispersion of velocity V
154-160 F7.5 km/s stdloc[W] Dispersion of velocity W
162-164 F3.1 --- corr-pos[XX] Correlation of coordinates X and X
166-173 F8.5 --- corr-pos[XY] Correlation of coordinates X and Y
175-182 F8.5 --- corr-pos[XZ] Correlation of coordinates X and Z
184-191 F8.5 --- corr-pos[YX] Correlation of coordinates Y and X
193-195 F3.1 --- corr-pos[YY] Correlation of coordinates Y and Y
197-205 E9.1 --- corr-pos[YZ] Correlation of coordinates Y and Z
207-214 F8.5 --- corr-pos[ZX] Correlation of coordinates Z and X
216-224 E9.1 --- corr-pos[ZY] Correlation of coordinates Z and Y
226-228 F3.1 --- corr-pos[ZZ] Correlation of coordinates Z and Z
230-232 F3.1 --- corr-vel[UU] Correlation of velocities U and U
234-242 E9.1 --- corr-vel[UV] Correlation of velocities U and V
244-251 F8.5 --- corr-vel[UW] Correlation of velocities U and W
253-261 E9.1 --- corr-vel[VU] Correlation of velocities V and U
263-265 F3.1 --- corr-vel[VV] Correlation of velocities V and V
267-274 F8.5 --- corr-vel[VW] Correlation of velocities V and W
276-283 F8.5 --- corr-vel[WU] Correlation of velocities W and U
285-292 F8.5 --- corr-vel[WV] Correlation of velocities W and V
294-296 F3.1 --- corr-vel[WW] Correlation of velocities W and W
298-305 F8.3 m/s/pc kappa Mean value of all three components of the
expansion rate
307-314 F8.3 m/s/pc kappaX Kappa component in Galactic X
316-323 F8.3 m/s/pc kappaY Kappa component in Galactic Y
325-332 F8.3 m/s/pc kappaZ Kappa component in Galactic Z
334-340 F7.3 m/s/pc omega Norm of the rotation vector omega
342-349 F8.3 m/s/pc omegaX Omega component in Galactic X (2)
351-358 F8.3 m/s/pc omegaY Omega component in Galactic Y (2)
360-367 F8.3 m/s/pc omegaZ Omega component in Galactic Z (2)
369-376 F8.3 m/s/pc w1 w1 non-isotopic dilatation parameter (2)
378-385 F8.3 m/s/pc w2 w2 non-isotopic dilatation parameter (2)
387-394 F8.3 m/s/pc w3 w3 non-isotopic dilatation parameter (2)
396-403 F8.3 m/s/pc w4 w4 non-isotopic dilatation parameter (2)
405-412 F8.3 m/s/pc w5 w5 non-isotopic dilatation parameter (2)
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Note (2): See Lindegren et al. 2000A&A...356.1119L 2000A&A...356.1119L, Eq. 4.
omegaX = 1/2(Tzy - Tyz)
omegaY = 1/2(Txz - Tzx)
omegaZ = 1/2(Tyx - Txy)
w1 = 1/2(Tzy + Tyz)
w2 = 1/2(Txz + Tzx)
w3 = 1/2(Tyx + Txy)
w4 = Txx
w5 = Tyy
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Byte-by-byte Description of file: tableb3.dat
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Bytes Format Units Label Explanations
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1- 11 A11 --- Assoc Abbreviated name of the association
13- 28 A16 --- Memb Abbreviated name of the membership list (G1)
30- 37 A8 --- RVori Abbreviated name of the RV origin
39- 57 I19 --- GaiaDR3 Gaia DR3 source identifier
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Global notes:
Note (G1): Abbreviated name of the membership list as follows:
BANYAN = Gagne et al., 2018ApJ...856...23G 2018ApJ...856...23G, 2018ApJ...860...43G 2018ApJ...860...43G,
Gagne & Faherty 2018ApJ...862..138G 2018ApJ...862..138G),
Lee & Song (2019MNRAS.486.3434L 2019MNRAS.486.3434L)
BANYAN-A = Gagne et al., 2018ApJ...856...23G 2018ApJ...856...23G, 2018ApJ...860...43G 2018ApJ...860...43G,
Gagne & Faherty 2018ApJ...862..138G 2018ApJ...862..138G),
Lee & Song (2019MNRAS.486.3434L 2019MNRAS.486.3434L)
BANYAN-B = Gagne et al., 2018ApJ...856...23G 2018ApJ...856...23G, 2018ApJ...860...43G 2018ApJ...860...43G,
Gagne & Faherty 2018ApJ...862..138G 2018ApJ...862..138G),
Lee & Song (2019MNRAS.486.3434L 2019MNRAS.486.3434L)
Booth+2020 = Booth et al. 2021MNRAS.500.5552B 2021MNRAS.500.5552B
Couture+2023 = Couture et al., 2023ApJ...946....6C 2023ApJ...946....6C
Crundall+2019 = Crundall et al., 2019MNRAS.489.3625C 2019MNRAS.489.3625C
Galli+2023 = Galli et al., 2023MNRAS.520.6245G 2023MNRAS.520.6245G
Galli+2024 = Galli et al., 2024A&A...689A..11G 2024A&A...689A..11G
Hunt+2024 = Hunt & Reffert, 2023A&A...673A.114H 2023A&A...673A.114H
L22-A = Luhman, 2022AJ....164..151L 2022AJ....164..151L
L22-B = Luhman, 2022AJ....164..151L 2022AJ....164..151L
L23-A = Luhman, 2023AJ....165..269L 2023AJ....165..269L
L23-B = Luhman, 2023AJ....165..269L 2023AJ....165..269L
LACEwING = Riedel et al., 2017AJ....153...95R 2017AJ....153...95R
Lee+2019 = Lee et al., 2019MNRAS.486.3434L 2019MNRAS.486.3434L, 2019MNRAS.489.2189L 2019MNRAS.489.2189L
Lee+2019-A = Lee et al., 2019MNRAS.486.3434L 2019MNRAS.486.3434L, 2019MNRAS.489.2189L 2019MNRAS.489.2189L
Lee+2019-B = Lee et al., 2019MNRAS.486.3434L 2019MNRAS.486.3434L, 2019MNRAS.489.2189L 2019MNRAS.489.2189L
Luhman2022 = Luhman, 2022AJ....164..151L 2022AJ....164..151L
Luhman2023 = Luhman, 2023AJ....165..269L 2023AJ....165..269L
Luhman2024 = Luhman, 2024AJ....168..159L 2024AJ....168..159L
Luhman2024-A = Luhman, 2024AJ....168..159L 2024AJ....168..159L
Luhman2024-AA = Luhman, 2024AJ....168..159L 2024AJ....168..159L
Luhman2024-AB = Luhman, 2024AJ....168..159L 2024AJ....168..159L
Luhman2024-B = Luhman, 2024AJ....168..159L 2024AJ....168..159L
Luhman2024-BA = Luhman, 2024AJ....168..159L 2024AJ....168..159L
Luhman2024-BB = Luhman, 2024AJ....168..159L 2024AJ....168..159L
Miret-Roig+2020 = Miret-Roig et al., 2020A&A...642A.179M 2020A&A...642A.179M
Miret-Roig+2025 = Miret-Roig et al., 2025A&A...694A..60M 2025A&A...694A..60M
Miret-Roig+2025a = Miret-Roig et al., 2025A&A...694A..60M 2025A&A...694A..60M
Miret-Roig+2025b = Miret-Roig et al., 2025A&A...694A..60M 2025A&A...694A..60M
Moranta+2022 = Moranta et al., 2022ApJ...939...94M 2022ApJ...939...94M
Qin+2023 = Qin et al., 2023ApJS..265...12Q 2023ApJS..265...12Q
SPYGLASS = Kerr et al., 2021ApJ...917...23K 2021ApJ...917...23K
SigMA = Ratzenbock et al., 2023A&A...677A..59R 2023A&A...677A..59R
UNION = Union of all lists
UNION-A = Union of all lists
UNION-B = Union of all lists
UNION-C = Union of all lists
UNIONS+L22 = Union of all lists
UNIONS+L22-A = Union of all lists
UNIONS+L22-B = Union of all lists
UNIONS+L22-C = Union of all lists
UNIONS-L22 = Union of all lists
Zerjal+2023 = Zerjal et al., 2023A&A...678A..75Z 2023A&A...678A..75Z
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Acknowledgements:
Javier Olivares, jolivares(at)dia.uned.es
(End) Patricia Vannier [CDS] 19-Jun-2025