A study of newly discovered close binary open cluster candidates in the Milky Way from Gaia DR3

Open Access

Table 4

Parameters for determining gravitationally bound and unbound cluster pairs.

Name₁	Name₂	Mass₁ [M_⊙]	Mass₂ [M_⊙]	r₁ [pc]	R_roche1 [pc]	r₂ [pc]	R_roche2 [pc]	∆ RV [km s⁻¹]	V_orb [km s⁻¹]
ASCC100	HSC534	1664.59±118.79	352.19±9.22	18.35±0.44	18.78±0.24	10.39±0.09	12.96±0.35	10.54±14.65	0.58±0.0011
BDSB93	HSC1740	416.29±10.45	18027.73±2279.65	17.24±0.14	5.11±1.09	7.64±0.32	18.71±0.30	5.08±18.87	1.90±0.0059
CWNU1024	OCSN82	7425.00±988.68	1939.08±134.03	61.10±2.71	43.27±1.14	29.6±0.68	31.51±1.56	6.12±16.42	0.82±0.0012
CWNU1173	CWNU1256	1864.56±266.66	928.03±268.96	34.80±1.66	28.58±1.82	13.88±1.34	24.33±2.14	1.49±13.05	0.53±0.0023
CWNU2666	HSC224	713.96±104.22	816.00±461.53	6.99±0.34	15.12±2.08	21.35±4.03	15.59±2.02	−	0.52±0.0041
HSC189	UPK24	621.52±50.97	1040.68±138.86	24.62±0.67	30.00±1.22	40.23±1.79	33.77±1.08	7.58±20.17	0.37±0.0009
HSC1897	HSC1911	1421.53±201.28	1527.33±54.87	24.50±1.16	30.05±1.02	36.40±0.44	30.55±1.00	0.01±18.21	0.51±0.0007
HSC2468	HSC2505	4984.30±861.13	4930.71±464.42	23.88±1.38	14.72±0.66	5.48±0.17	14.69±0.66	1.12±12.06	1.35±0.0013
HSC2571	Platais12	550.45±73.75	4059.79±116.79	14.33±0.64	24.70±1.42	46.17±0.44	40.45±0.87	3.32±11.10	0.61±0.0017

Notes. R_roche is the Roche radius. ∆_RV denotes the difference in the radial velocities of two sub-clusters. V_orb denotes the orbital velocity. Tidal radii r₁ and r₂ were taken from HR23, and the other parameters were calculated here. The boldface indicates gravitationally bound binary clusters.

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