Reaching the boundary between stellar kinematic groups and very wide binaries - The Washington double stars with the widest angular separations

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Volume 507 / No 1 (November III 2009)

A&A, 507 1 (2009) 251-259

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Table 5:

Multiple systems in the solar neighbourhood with at least one low-mass component ( $\mathcal{M} < 0.15~M_\odot$ ) and the lowest binding energies for their total masses.
WDS	Primary	Secondary	s	$\mathcal{M}_1$	$\mathcal{M}_2$	U_g^*	Discovery
identifier			[10³ AU]	[ $M_\odot$ ]	[ $M_\odot$ ]	[10³³ J]	reference
00212-4246^a	Kö 1 A	Kö 1 B	1.8	0.103	0.079	-8.0	Caballero (2007a)
01269-5023	2M0126-50 A	2M0126-50 B	5.1	0.095	0.092	-3.0	Artigau et al. (2007)
12076-3933	2M1207-39 A	2M1207-39 B	0.046	0.025	0.005	-4.8	Chauvin et al. (2004)
...^b	2M1258+40 A	2M1258+40 B	6.7	0.105	0.091	-2.5	Radigan et al. (2009)
15232+3017^c	$\eta$ CrB AB	$\eta$ CrB C	3.6	2.000	0.060	-59	Kirkpatrick et al. (2001)
23315-0405^d	Kö 3 A	Kö 3 BC	11.9	1.02	0.160	-24	Caballero 2007b)
...	Sun	Uranus	0.019191	1.000	$4.367\times 10^{-5}$	-4.0	Herschel 1783^e
...	Sun	Neptune	0.030069	1.000	$5.151\times 10^{-5}$	-3.0	Le Verrier (1847)^f

^a The (abridged) names of the components in the Koenigstuhl 1 system are LEHPM 494 (Kö 1 A) and DE0021-42 (Kö 1 B); ^b the system 2M1258+40 AB awaits a WDS numbering; ^c Kirkpatrick et al. (2001) used the name ``Gl 584C'' for the brown dwarf companion $\eta$ CrB C. The primary $\eta$ CrB AB is a spectroscopic binary with individual masses 1.003 and 0.997 $M_\odot$ ; ^d the (abridged) names of the components in the Koenigstuhl 3 system are HD 221356 (Kö 3 A) and 2M2331-04 AB (Kö 3 BC). The secondary is, in its turn, an M8.0V + L3.0V close binary with individual masses 0.088 and 0.072 $M_\odot$ (Gizis et al. 2000, 2003; Caballero 2007b); ^e actually, Uranus was pointed out by William Herschel in March 1781; ^f there is a consensus that Urbain Le Verrier, John Couch Adams, and Johann Galle jointly deserve credit for discovering Neptune.

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