Dynamical state of four open clusters | Astronomy & Astrophysics (A&A)

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Table 5

Summary of fundamental parameters and dynamical properties of the four open clusters.

Parameter	NGC 7243	NGC 2301	NGC 1528	NGC 2281
Right Ascension (J2000) (deg)	333.795	102.945	63.847	102.075
Declination (J2000) (deg)	49.875	0.465	51.19	41.08
log (t/yr)	8,18 ± 0,17	8,34 ± 0,07	8,57 ± 0,04	8,81 ± 0,04
t (Myr)	$150_{- 50}^{+ 70}$ $Mathematical equation: $150_{ - 50}^{ + 70}$$	$220_{- 30}^{+ 40}$ $Mathematical equation: $220_{ - 30}^{ + 40}$$	370 ± 30	650 ± 50
[Fe/H]	0,00 ± 0,02	−0,03 ± 0,03	0,00 ± 0,02	+0,12 ± 0,02
(m − M)₀	9,31 ± 0,09	9,39 ± 0,07	9,34 ± 0,07	8,34 ± 0,07
E(B − V)	0,23 ± 0,01	0,08 ± 0,01	0,29 ± 0,01	0,08 ± 0,01
Tidal radius (pc)	10.69	13.13	11.24	11.03
Tidal masses (M_⊙)	484	793	497	493
Number of cluster members	503	828	463	717
OC A (km s⁻¹ kpc⁻¹)	+15,06 ± 0,3	+14,19 ± 0,4	+14,17 ± 0,3	+14,52 ± 0,4
OC B (km s⁻¹ kpc⁻¹)	−13,23 ± 0,5	−12,36 ± 0,4	−12,34 ± 0,4	−12,69 ± 0,4
t_relax (Myr)^a	35.2	66.0	34.6	49.0
τ = Age/t_relax	4.26	3.34	10.7	13.3
α (Inner region)^b	−2,48 ± 0,08	−2,61 ± 0,19	−2,14 ± 0,16	−2,63 ± 0,29
α (Outer region)^b	−2,54 ± 0,55	−2,16 ± 0,67	−2,27 ± 0,34	−3,76 ± 0,23

Notes. ^a The relaxation time of the four open clusters. ^b Fitting parameters for the mass functions of the four open clusters.

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