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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Table 1

Observed objects in Chamaeleon I.

Object^a	RA	Dec	System	Bin.	Spectral	SpT	Dist.	Dist.	2MASS	Backg.^e
	[h m s]^a^,^b	[ ]^a^,^b	architecture^c	Ref.	types	Ref.	[pc]	Ref.	K [mag]^d	density

DI Cha	11 07 20.72	−77 38 07.3	+	1, 2, 3	G2+M6+M5.5+M5.5	4,3	223^f	5	6.217	0.070
Sz 22	11 07 57.93	−77 38 44.9	+w	3, 6, 7	K7+M4.5+M2+M3	8,3,9	165	Cha I	6.830	0.070
CHXR 32	11 08 14.94	−77 33 52.2	+*	10, 3	G5+M1+M3.5	11,3	165	Cha I	6.182^g	0.070
Cha Hα 5	11 08 24.11	−77 41 47.4	**	3	M6.5+M6.5	12,3	165	Cha I	10.711	0.091

Notes.

^(a)

Taken from the SIMBAD database (Wenger et al. 2007).

^(b)

International Celestial Reference System (ICRS) coordinates (epoch = J2000).

^(c)

Updated multiplicity of the objects: *: star, **: binary, w**: wide binary stellar companion candidate, please see text for previously known multiplicity.

^(d)

Skrutskie et al. (2006); Cutri et al. (2003).

^(e)

Expected number of background stars in the NACO S13 field of view (see text).

^(f)

See text for a discussion.

^(g)

Value by Carpenter et al. (2002), as 2MASS only lists an upper limit, according to non-detection.

References. (1) Reipurth & Zinnecker (1993). (2) Simultaneously imaged by Lafrenière et al. (2008) and by us (here). (3) Newly found (here). (4) Henize & Mendoza (1973). (5) van Leeuwen (2007). (6) Ghez et al. (1997). (7) Lafrenière et al. (2008). (8) Comerón et al. (1999). (9) Gómez & Mardones (2003). (10) Chelli et al. (1988). (11) Feigelson & Kriss (1989). (12) López Martí et al. (2004).

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