Expansion kinematics of young clusters - II. NGC 2264 N & S and Collinder 95 with HectoSpec

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Volume 710 (June 2026)

A&A, 710 (2026) A402

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Table 2

Physical properties of NGC 2264 N, NGC 2264 S, and Collinder 95.

	NGC 2264 N	NGC 2264 S	Collinder 95
Central RA, Dec (°)	(100.25, 9.88)¹	(100.28, 9.53)²	(97.788, 9.894)³
Central μ_α (mas/yr)	$- {1.72}_{- 0.06}^{+ 0.06}$ $Mathematical equation: $-1.72^{+0.06}_{-0.06}$$ ²	$- {2.18}_{- 0.42}^{+ 0.66}$ $Mathematical equation: $-2.18^{+0.66}_{-0.42}$$ ⁴	$- {2.26}_{- 0.35}^{+ 0.35}$ $Mathematical equation: $-2.26^{+0.35}_{-0.35}$$ ³
Central μ_δ (mas/yr)	$- {3.71}_{- 0.06}^{+ 0.06}$ $Mathematical equation: $-3.71^{+0.06}_{-0.06}$$ ²	$- {3.75}_{- 0.40}^{+ 0.27}$ $Mathematical equation: $-3.75^{+0.27}_{-0.40}$$ ⁴	$- {5.16}_{- 0.31}^{+ 0.31}$ $Mathematical equation: $-5.16^{+0.31}_{-0.31}$$ ³
Distance (pc)	$719_{- 21}^{+ 22}$ $Mathematical equation: $719^{+22}_{-21}$$ ³	$722_{- 21}^{+ 22}$ $Mathematical equation: $722^{+22}_{-21}$$ ³	${659.0}_{- 24.1}^{+ 86.7}$ $Mathematical equation: $659.0^{+86.7}_{-24.1}$$ ³
Expansion velocity ῡ_out (km/s)	${0.45}_{- 0.11}^{+ 0.11}$ $Mathematical equation: $0.45^{+0.11}_{-0.11}$$	${0.23}_{- 0.10}^{+ 0.10}$ $Mathematical equation: $0.23^{+0.10}_{-0.10}$$	${0.51}_{- 0.08}^{+ 0.08}$ $Mathematical equation: $0.51^{+0.08}_{-0.08}$$
Core radius r_c (pc)	0.65	1.40	1.27
No. YSOs within r_c	24	72	26
Half-mass radius r₅₀ (pc)	3.83⁵	3.70⁵	3.69⁵
Velocity dispersion σ_{v_l}(r_c) (km/s)	${0.96}_{- 0.19}^{+ 0.25}$ $Mathematical equation: $0.96^{+0.25}_{-0.19}$$	${1.29}_{- 0.14}^{+ 0.17}$ $Mathematical equation: $1.29^{+0.17}_{-0.14}$$	${5.39}_{- 0.86}^{+ 1.11}$ $Mathematical equation: $5.39^{+1.11}_{-0.86}$$
Velocity dispersion σ_{v_b}(r_c) (km/s)	${0.65}_{- 0.18}^{+ 0.25}$ $Mathematical equation: $0.65^{+0.25}_{-0.18}$$	${1.77}_{- 0.19}^{+ 0.23}$ $Mathematical equation: $1.77^{+0.23}_{-0.19}$$	${4.27}_{- 0.70}^{+ 0.96}$ $Mathematical equation: $4.27^{+0.96}_{-0.70}$$
Velocity dispersion σ_{v_l}(r₅₀) (km/s)	${2.56}_{- 0.19}^{+ 0.22}$ $Mathematical equation: $2.56^{+0.22}_{-0.19}$$	${3.15}_{- 0.30}^{+ 0.33}$ $Mathematical equation: $3.15^{+0.33}_{-0.30}$$	${3.51}_{- 0.37}^{+ 0.44}$ $Mathematical equation: $3.51^{+0.44}_{-0.37}$$
Velocity dispersion σ_{v_b}(r₅₀) (km/s)	${3.60}_{- 0.23}^{+ 0.26}$ $Mathematical equation: $3.60^{+0.26}_{-0.23}$$	${2.27}_{- 0.15}^{+ 0.18}$ $Mathematical equation: $2.27^{+0.18}_{-0.15}$$	${3.51}_{- 0.37}^{+ 0.45}$ $Mathematical equation: $3.51^{+0.45}_{-0.37}$$
Crossing time τ_cross(r_c) (Myr)	${0.79}_{- 0.13}^{+ 0.18}$ $Mathematical equation: $0.79^{+0.18}_{-0.13}$$	${0.91}_{- 0.07}^{+ 0.08}$ $Mathematical equation: $0.91^{+0.08}_{-0.07}$$	${0.26}_{- 0.03}^{+ 0.04}$ $Mathematical equation: $0.26^{+0.04}_{-0.03}$$
Crossing time τ_cross(r₅₀) (Myr)	${1.23}_{- 0.06}^{+ 0.07}$ $Mathematical equation: $1.23^{+0.07}_{-0.06}$$	${1.34}_{- 0.08}^{+ 0.09}$ $Mathematical equation: $1.34^{+0.09}_{-0.08}$$	${0.92}_{- 0.07}^{+ 0.08}$ $Mathematical equation: $0.92^{+0.08}_{-0.07}$$
No. YSOs with closest approach < r_c	24	29	21
No. YSOs with closest approach −σ < r_c	63	50	49
No. YSOs with closest approach −2σ < r_c	113	69	60
No. YSOs with closest approach −3σ < r_c	132	81	61

Notes. See the text for a discussion of how these quantities were derived. ¹ Cluster center value taken from Maíz Apellániz (2019) and adjusted (+0.05°, +0) to center accurately on the cluster core of YSOs. ² Values taken from Maíz Apellániz (2019).³ Values taken from Cantat-Gaudin et al. (2020b). ⁴ NGC 2264 S central proper motion value calculated by taking the median proper motion value of all YSOs located below a declination of 9.7°. ⁵ Half-mass radii of each cluster calculated by taking the median distance from cluster center of all member YSOs.

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