Expansion kinematics of young clusters - I. Lambda Ori

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Volume 692 (December 2024)

A&A, 692 (2024) A166

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Table 1

Kinematic properties for the λ Ori cluster with cluster members identified by Cantat-Gaudin et al. (2020).

No. Members with RUWE < 1.4	563
Mean RA (°)	${83.788}_{- 0.037}^{+ 0.038}$ $\[83.788_{-0.037}^{+0.038}\]$
Mean Dec (°)	${9.823}_{- 0.031}^{+ 0.031}$ $\[9.823_{-0.031}^{+0.031}\]$
Mean μ_α (masyr⁻¹)	${1.137}_{- 0.020}^{+ 0.020}$ $\[1.137_{-0.020}^{+0.020}\]$
Mean μ_δ (masyr⁻¹)	$- {2.079}_{- 0.014}^{+ 0.015}$ $\[-2.079_{-0.014}^{+0.015}\]$
Mean l (°)	${195.150}_{- 0.039}^{+ 0.039}$ $\[195.150_{-0.039}^{+0.039}\]$
Mean b (°)	$- {12.045}_{- 29}^{+ 29}$ $\[-12.045_{-0.029}^{+0.029}\]$
Centre of Mass l (°)	${195.085}_{- 0.023}^{+ 0.012}$ $\[195.085_{-0.023}^{+0.012}\]$
Centre of Mass b (°)	$- {11.978}_{- 0.009}^{+ 0.006}$ $\[-11.978_{-0.009}^{+0.006}\]$
Core radius (pc)	0.44
Cluster core velocity v_l₀ (kms⁻¹)	${4.046}_{- 0.077}^{+ 0.079}$ $\[4.046_{-0.077}^{+0.079}\]$
Cluster core velocity v_b₀ (kms⁻¹)	$- {0.669}_{- 0.049}^{+ 0.045}$ $\[-0.669_{-0.049}^{+0.045}\]$
2D Ellipse θ (°)	24.3
2D Ellipse e	0.695
No. RVs	189
Median RV (kms⁻¹)	${27.47}_{- 0.08}^{+ 0.08}$ $\[27.47_{-0.08}^{+0.08}\]$
Median LSR RV (kms⁻¹)	${12.37}_{- 0.08}^{+ 0.08}$ $\[12.37_{-0.08}^{+0.08}\]$
Median distance (pc)	${399.68}_{- 0.89}^{+ 0.89}$ $\[399.68_{-0.89}^{+0.89}\]$
Fraction of members with \|Δθ\| < 45°	0.59
Fraction of members with \|Δθ\| < 90°	0.74
Expansion velocity (kms⁻¹)	${0.711}_{- 0.021}^{+ 0.021}$ $\[0.711_{-0.021}^{+0.021}\]$
Rotational velocity (kms⁻¹)	${0.097}_{- 0.018}^{+ 0.018}$ $\[0.097_{-0.018}^{+0.018}\]$
1D expansion rate (kms⁻¹ pc⁻¹)	${0.181}_{- 0.030}^{+ 0.030}$ $\[0.181_{-0.030}^{+0.030}\]$
1D expansion timescale (Myr)	${5.637}_{- 0.800}^{+ 1.109}$ $\[5.637_{-0.800}^{+1.109}\]$
Max expansion rate (kms⁻¹ pc⁻¹)	${0.144}_{- 0.003}^{+ 0.003}$ $\[0.144_{-0.003}^{+0.003}\]$
Max expansion angle (°)	−34
Max expansion timescale (Myr)	${6.944}_{- 0.142}^{+ 0.148}$ $\[6.944_{-0.142}^{+0.148}\]$
Min expansion rate (kms⁻¹ pc⁻¹)	${0.119}_{- 0.004}^{+ 0.004}$ $\[0.119_{-0.004}^{+0.004}\]$
Min expansion angle (°)	80
Min expansion timescale (Myr)	${8.403}_{- 0.273}^{+ 0.292}$ $\[8.403_{-0.273}^{+0.292}\]$
Expansion asymmetry (σ)	5.0
Max velocity dispersion (kms⁻¹)	${1.225}_{- 0.043}^{+ 0.048}$ $\[1.225_{-0.043}^{+0.048}\]$
Max velocity dispersion angle (°)	32
Min velocity dispersion (kms⁻¹)	${0.771}_{- 0.026}^{+ 0.029}$ $\[0.771_{-0.026}^{+0.029}\]$
Min velocity dispersion angle (°)	−62
Velocity dispersion asymmetry (σ)	8
Max rotation rate (kms⁻¹ pc⁻¹)	${0.039}_{- 0.009}^{+ 0.009}$ $\[0.039_{-0.009}^{+0.009}\]$
Max rotation rate angle (°)	−40
Min rotation rate (kms⁻¹ pc⁻¹)	$- {0.055}_{- 0.007}^{+ 0.007}$ $\[-0.055_{-0.007}^{+0.007}\]$
Min rotation rate angle (°)	76
Rotation asymmetry (σ)	8
Minimum area traceback timescale (Myr)	${4.1}_{- 0.1}^{+ 0.1}$ $\[4.1_{-0.1}^{+0.1}\]$
Median 2D closest approach distance for expanding members (°)	0.26
Median 2D closest approach timescale for expanding members (Myr)	4.73

Notes. See the text for a discussion of how these quantities were derived.

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