New companions in the stellar systems of DI Cha, Sz 22, CHXR 32, and Cha Hα 5 in the Chamaeleon I star-forming region

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Volume 557 (September 2013)

A&A, 557 (2013) A80

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Table 5

Absolute astrometric results.

Object	JD−2 448 000	Ref.	Separation	Sign.^a	Sign. orb.	PA^b	Sign.^a	Sign. orb.
	[days]		[arcsec]	not Backg.	motion	[°]	not Backg.	motion
			ρ ± δ _ρ	σ _{ρ, back}	σ _{ρ, orb}	PA ± δ _PA	σ _{PA, back}	σ _{PA, orb}

DI Cha AB	5783.85826		4.5444 ± 0.0609	0.5	0.1	202.375 ± 1.236	0.4	0.1
	5821.80131	1	4.557 ± 0.017	0.4	0.0	202.1 ± 0.6	0.6	0.3
	6515.62668		4.5510 ± 0.0689	0.2	0.0	202.542 ± 1.400	0.1	0.0
	6882.64078		4.5556 ± 0.0729	^c	^c	202.559 ± 1.482	^c	^c
AC	5783.85826		4.6015 ± 0.0616	0.3	0.0	202.062 ± 1.236	0.3	0.0
	6515.62668		4.6007 ± 0.0696	0.1	0.0	202.136 ± 1.400	0.1	0.0
	6882.64078		4.5966 ± 0.0735	^c	^c	202.149 ± 1.482	^c	^c
A(BC)^d	1476.50000	2	4.9 ± 0.2	0.7	1.5	202 ± 3	0.8	0.3
	3578.23716	3,4	4.5926 ± 0.0171	1.1	0.2	201.981 ± 0.096	1.2	0.2
	5783.85826		4.5740 ± 0.0613	0.4	0.0	202.206 ± 1.236	0.3	0.1
	6515.62668		4.5762 ± 0.0692	0.1	0.0	202.331 ± 1.400	0.1	0.0
	6882.64078		4.5765 ± 0.0732	^c	^c	202.345 ± 1.482	^c	^c
BC	5783.85826		0.0623 ± 0.0012	1.8	4.5	178.613 ± 1.661	6.2	6.4
	5821.80131	1	0.066 ± 0.005	0.8	2.6	177.9 ± 2.3	5.8	5.0
	6515.62668		0.0593 ± 0.0018	1.0	2.5	169.131 ± 1.579	4.5	2.3
	6882.64078		0.0524 ± 0.0017	^c	^c	163.808 ± 1.629	^c	^c
AD	5783.85826		0.2071 ± 0.0038	6.6	0.7	227.326 ± 1.435	4.2	3.1
	6515.62668		0.2100 ± 0.0046	2.6	0.2	231.638 ± 1.620	1.6	1.0
	6882.64078		0.2105 ± 0.0038	^c	^c	233.890 ± 1.529	^c	^c
Sz 22 AB	5783.88427		0.5107 ± 0.0068	3.8	0.5	271.709 ± 1.236	1.1	0.1
	6515.64511		0.5157 ± 0.0078	^c	^c	271.577 ± 1.402	^c	^c
CHXR 32 AB	5819.91198	6	2.4372 ± 0.0330	0.9	0.2	285.011 ± 1.244	0.2	0.0
	6882.90637		2.4471 ± 0.0391	^c	^c	284.924 ± 1.482	^c	^c
AC	5819.91198	6	2.3681 ± 0.0345	1.4	0.3	285.311 ± 1.249	0.0	0.2
	6882.90637		2.3534 ± 0.0377	^c	^c	285.649 ± 1.482	^c	^c
A(BC)^d	1476.50000	2	2.5 ± 0.5	0.7	0.1	284 ± 5	0.1	0.2
	4690.70849	5	2.430 ± 0.002	2.8	0.1	285.1 ± 0.5	0.4	0.0
	5819.91198	6	2.4215 ± 0.0329	1.1	0.1	285.077 ± 1.244	0.2	0.0
	6516.89621		2.4292 ± 0.0369	0.5	0.1	285.103 ± 1.401	0.1	0.0
	6882.90637		2.4257 ± 0.0388	^c	^c	285.084 ± 1.482	^c	^c
A(BC)^e	5819.91198	6	2.4095 ± 0.0329	1.1	0.0	285.129 ± 1.245	0.1	0.0
	6882.90637		2.4096 ± 0.0385	^c	^c	285.213 ± 1.482	^c	^c
BC	5819.91198	6	0.0702 ± 0.0109	0.7	2.5	94.834 ± 2.801	3.1	2.4
	6882.90637		0.0984 ± 0.0016	^c	^c	87.322 ± 1.497	^c	^c
Cha Hα 5 AB	5782.75127		0.0481 ± 0.0023	1.4	0.6	88.244 ± 4.837	8.4	2.6
	6881.73805		0.0458 ± 0.0028	^c	^c	111.840 ± 7.758	^c	^c
Acc1	5782.75127		1.4104 ± 0.0191	0.1	0.8	222.108 ± 1.243	0.9	0.7
	6881.73805		1.3884 ± 0.0223	^c	^c	220.738 ± 1.483	^c	^c
Bcc1	5782.75127		1.4442 ± 0.0195	0.3	1.3	223.484 ± 1.240	1.0	0.5
	6881.73805		1.4040 ± 0.0228	^c	^c	222.508 ± 1.490	^c	^c
(AB)cc1^f	5782.75127		1.4272 ± 0.0194	0.1	1.0	222.804 ± 1.244	0.9	0.6
	6516.68649		1.4103 ± 0.0213	0.1	0.4	222.077 ± 1.400	0.3	0.2
	6881.73805		1.3963 ± 0.0225	^c	^c	221.619 ± 1.486	^c	^c

Notes.

^(a)

Assuming the fainter component is a non-moving background star.

^(b)

Position Angle (PA) is measured from N over E to S.

^(c)

Significances are given relative to the last epoch.

^(d)

Results of component A relative to the centre of brightness of components B and C.

^(e)

Results of component A relative to the centre of mass (masses from apparent magnitudes, Table 9, and distance of Chamaeleon cloud of 165 ± 30 pc, using the models of Baraffe et al. (1998), giving for B 0.76 M_⊙ and for C 0.28 M_⊙ at 2 Myr) of components B and C.

^(f)

Results of the centre of brightness of components A and B relative to the further companion candidate cc1.

References. (1) Lafrenière et al. (2008). (2) Ghez et al. (1997); date given, assuming midnight for calculation of JD. (3) HST data from ESO/ST-ECF science archive, only position measurement error in RA and Dec considered. (4) From ESO/ST-ECF science archive, see also Stapelfeldt (2001), Padgett & Stapelfeldt (2001). (5) Correia et al. (2006). (6) Rereduced, see also Lafrenière et al. (2008).

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