Astrometric confirmation of young low-mass binaries and multiple systems in the Chamaeleon star-forming regions

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Volume 546 (October 2012)

A&A, 546 (2012) A63

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Table 1

Observed objects in Chamaeleon.

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

RX J0915.5-7609	09 15 29.12	–76 08 47.2	**	1	K7+?	2	168	3	8.488	0.135
RX J0919.4-7738	09 19 24.96	–77 38 37.0	SB2+**	4, 2, 1	G7+?+K0+?	5	57	6	6.780	0.137
RX J0935.0-7804	09 34 56.04	–78 04 19.4	**	1	M2+?	2	168	3	8.889	0.132
RX J0952.7-7933	09 53 13.74	–79 33 28.5	*+SB2	2, 1	F6?+F6+F6?	2	170?	7	7.994	0.122
RX J1014.2-7636	10 14 08.07	–76 36 32.8	**	1	M3+?	2	165?		8.874	0.154
SZ Cha	10 58 16.77	–77 17 17.1	SB?++w	8, 9	K0+M5+?	9, 10	165	Cha I	7.758	0.144
Ced 110 IRS 2	11 06 15.41	–77 21 57.0	*+w	10, 11	G5+?+?	12	165	Cha I	6.419	0.056
Cha Hα 2	11 07 42.46	–77 33 59.4	**	13, 14	M6+M6?	15	165	Cha I	10.675	0.062
VW Cha	11 08 01.49	–77 42 28.9	SB?+*+w	16, 17	K6+K7+?+M2.5	18	165	Cha I	6.962	0.088
RX J1109.4-7627	11 09 17.70	–76 27 57.8	**	19, 20	K7+?	2	165	Cha I	8.701	0.141
HD 97300	11 09 50.02	–76 36 47.7	**	8	B9+?	21	179	6	7.149	0.098
WX Cha	11 09 58.74	–77 37 08.9	**	8	K0-M1.25+?	12	165	Cha I	7.970	0.096
WY Cha	11 10 07.05	–76 29 37.7	*+w	20, 10	K2-M0+?+?	12	165	Cha I	8.451	0.127
HJM C 7-11	11 10 38.02	–77 32 39.9	SB?++w	8, 22	K3+?+?	2	165	Cha I	8.277	0.107
Sz 41	11 12 24.42	–76 37 06.4	SB?++w	23	K4+?+G8	2, 24	165	Cha I	7.999	0.166
HM Anon	11 12 42.69	–77 22 23.1	**	8	G8+?	25	165	Cha I	7.880	0.124

Notes.

^(a)

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

^(b)

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

^(c)

Previously known and supposed multiplicity of the objects: *: star, **: binary, SB: spectroscopic binary, SB2: double-lined spectroscopic binary, w*: wide stellar companion candidate.

^(d)

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

^(e)

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

References. (1) Köhler (2001). (2) Covino et al. (1997). (3) Sartori et al. (2003). (4) Torres (1986). (5) Torres et al. (2006). (6) van Leeuwen (2007). (7) Frink et al. (1998). (8) Ghez et al. (1997). (9) Reipurth et al. (2002). (10) Kraus & Hillenbrand (2007). (11) Simultaneously imaged. by Lafrenière et al. (2008) and by us (here). (12) Luhman (2007). (13) supposed by Neuhäuser et al. (2002). (14) confirmed by Ahmic et al. (2007), Lafrenière et al. (2008) and Schmidt et al. (2008b). (15) Schmidt et al. (2008b). (16) wide companion candidate: Reipurth & Zinnecker (1993), close binary: Brandner (1992), close triple: Brandeker et al. (2001). (17) Possibly SB in Melo (2003) and Torres et al. (2006), but could be the signal of the close triple. (18) Brandner & Zinnecker (1997), Sz 23 (VW Cha D?): Comerón et al. (1999). (19) Damjanov et al. (2007). (20) Lafrenière et al. (2008). (21) Rydgren (1980). (22) SB?: Torres et al. (2006), w*: Kraus & Hillenbrand (2007). (23) **, w*: Brandner (1992); Reipurth & Zinnecker (1993), SB? (primary and secondary in spectrograph entrance window): Reipurth et al. (2002). (24) Hyland et al. (1982). (25) Preibisch (1997).

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