2008ApJ...683..844L


C.D.S. - SIMBAD4 rel 1.7 - 2021.03.05CET16:30:03

2008ApJ...683..844L - Astrophys. J., 683, 844-861 (2008/August-3)

A multiplicity census of young stars in Chamaeleon I.

LAFRENIERE D., JAYAWARDHANA R., BRANDEKER A., AHMIC M. and VAN KERKWIJK M.H.

Abstract (from CDS):

We present the results of a multiplicity survey of 126 stars spanning ∼0.1-3 M in the ∼2 Myr old Chamaeleon I star-forming region, based on adaptive optics imaging with the ESO Very Large Telescope. Our observations have revealed 30 binaries and six triples, of which 19 and four, respectively, are new discoveries. The overall multiplicity fraction we find for Cha I (∼30%) is similar to those reported for other dispersed young associations, but significantly higher than seen in denser clusters and the field, for comparable samples. Both the frequency and the maximum separation of Cha I binaries decline with decreasing mass, while the mass ratios approach unity; conversely, tighter pairs are more likely to be equal mass. We confirm that brown dwarf companions to stars are rare, even at young ages at wide separations. Based on follow-up spectroscopy of two low-mass substellar companion candidates, we conclude that both are likely background stars. The overall multiplicity fraction in Cha I is in rough agreement with numerical simulations of cloud collapse and fragmentation, but its observed mass dependence is less steep than predicted. The paucity of higher order multiples, in particular, provides a stringent constraint on the simulations, and seems to indicate a low level of turbulence in the prestellar cores in Cha I.

Abstract Copyright:

Journal keyword(s): Stars: Binaries: General - Stars: Formation - Stars: Low-Mass, Brown Dwarfs

Simbad objects: 140

goto Full paper

goto View the reference in ADS

Number of rows : 140

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 BCLMP 35 HII 01 33 39.46 +30 38 07.3     12.5     ~ 6 0
2 BCLMP 53 SR? 01 33 40.2 +30 41 39     12.4     ~ 7 0
3 BCLMP 43 HII 01 33 48.38 +30 39 35.6           ~ 11 0
4 IC 348 OpC 03 44 34 +32 09.8           ~ 1247 1
5 NAME Tau-Aur Complex SFR 04 30 +25.0           ~ 1247 0
6 HD 36395 PM* 05 31 27.3958475290 -03 40 38.021551815 10.626 9.443 7.968 6.996 5.913 M1.5Ve 440 0
7 NAME Orion Nebula Cluster OpC 05 35.0 -05 29           ~ 2040 1
8 HD 93828 * 10 46 37.9024820921 -77 36 03.585110866   10.00 9.35   8.88 F0V 15 0
9 HD 94414 * 10 50 55.9491869107 -77 07 28.551731411   8.43 8.01     B4V 35 0
10 Hen 3-545 Or* 10 59 06.9712894449 -77 01 40.309036535   12.91 11.136   9.596 K4Ve 193 0
11 Ass Cha T 1-6 Y*O 11 00 40.2412351728 -76 19 28.007242344   14.7     13.64 M4e 34 0
12 CHXR 9C Y*O 11 01 18.723 -76 27 02.56   15.46 13.90 13.55 11.56 M1.5+M2 16 1
13 V* CS Cha Or* 11 02 24.8849252208 -77 33 35.683462615   12.88 11.69   10.123 K2Ve 201 0
14 Hn 1 Y*O 11 02 32.5992281327 -77 29 13.008552253         13.10 M3+M5 38 0
15 Ass Cha T 1-8 TT* 11 02 55.0246345871 -77 21 50.814132195     16.25 15.17 13.40 M4.5e 50 0
16 ISO-ChaI 28 Y*O 11 03 41.8506531591 -77 26 52.113632297           M5.5e 17 0
17 V* GR Cha Or* 11 03 47.6444437349 -77 19 56.421700753         13.91 M5e 24 0
18 Hn 3 Y*O 11 03 56.8248481185 -77 21 32.994947040   17.05 15.44 15.03 12.57 M4IIIe 29 0
19 V* CT Cha Or* 11 04 09.0989057683 -76 27 19.326914289   13.44 13.00   10.89 K7Ve 112 0
20 CHSM 1982 Y*O 11 04 10.6080493790 -76 12 49.058501690           M6e 14 0
21 BYB 18 Y*O 11 04 42.5993743243 -77 41 57.172118661         13.63 M4.5e 51 0
22 CHXR 14N Y*O 11 04 51.0229111739 -76 25 24.078948749   15.98 14.13   11.89 K4Ve 22 0
23 CHXR 14S Y*O 11 04 52.8623059984 -76 25 51.535117807   16.51 14.66   12.05 K8Ve 20 0
24 Sz 13 Or* 11 04 57.0098115161 -77 15 57.051233669     18.91 16.65 14.68 M3e 38 0
25 Hn 4 Y*O 11 05 14.5496059237 -77 11 29.219513274         13.20 M4+M3 24 0
26 CHXR 15 Y*O 11 05 42.8798706942 -77 26 51.564304595         13.51 M5+M5 31 0
27 V* UV Cha Or* 11 05 52.6269581822 -76 18 25.458428843   15.13 13.69 13.21 11.58 K5Ve 34 0
28 HD 96675 Y*O 11 05 57.8104415475 -76 07 48.883424761   7.82 7.68   8.48 B6IV/V 72 0
29 Ass Cha T 2-21 TT* 11 06 15.3485848381 -77 21 56.737939872   12.58 11.01   9.35 G5Ve 125 0
30 [CCE98] 2-19 Y*O 11 06 15.4367164700 -77 37 50.161995540         16.40 M3e 15 0
31 CHXR 73 Y*O 11 06 28.7626436677 -77 37 33.144403799         15.78 M3e 42 1
32 [NC98] Cha HA 12 Em* 11 06 37.9644089837 -77 43 09.114902996     20.6   15.91 M6.5e 37 0
33 Hn 5 Or* 11 06 41.7898286101 -76 35 49.064605354         13.61 M4.5e 39 0
34 Ass Cha T 2-22 Y*O 11 06 43.4643282637 -77 26 34.439892844         13.02 M3e 34 0
35 V* UX Cha Or* 11 06 45.0955906069 -77 27 02.383778673     14.78   12.07 K5Ve 54 0
36 NAME Cha 1 MoC 11 06 48 -77 18.0           ~ 1011 1
37 CHXR 74 TT* 11 06 57.3104472434 -77 42 10.645175426         13.66 M3Ve 42 0
38 V* UY Cha Or* 11 06 59.0259228302 -77 18 53.406348011         12.97 M4Ve 56 0
39 Hn 6 Y*O 11 07 11.4517064116 -77 46 39.352554383         13.31 M3e 35 0
40 V* UZ Cha Or* 11 07 12.0599793783 -76 32 23.245866021         12.62 K8Ve 50 0
41 [CCE98] 1-46 Y*O 11 07 13.2882531875 -77 43 49.778015603         14.77 M3.5e 40 0
42 [NC98] Cha HA 1 Y*O 11 07 16.6694944374 -77 35 53.222755937   22.8 21.0   16.38 M7.5/8e 82 0
43 [NC98] Cha HA 9 BD* 11 07 18.5742862738 -77 32 51.553842979     23.1   17.57 M5.5e 48 0
44 Ass Cha T 1-12 Y*O 11 07 19.1458095174 -76 03 04.866052625   17.05 15.35   12.57 M4Ve 64 0
45 V* DI Cha Or* 11 07 20.7272524388 -77 38 07.303742740   12.02 10.74 10.72   G2Ve 149 0
46 [CCE98] 2-24 Y*O 11 07 21.426 -77 22 11.76           M2 33 0
47 V* VV Cha Or* 11 07 28.241088 -76 52 11.92620   16.00 14.72 14.48 12.19 M1.5+M3 62 0
48 CHXR 76 Or* 11 07 35.1777230466 -77 34 49.293344749   20.04 18.15   14.39 M4e 42 0
49 CHXR 26 Y*O 11 07 36.869 -77 33 33.52         15.18 M3.5e 26 0
50 CHSM 10496 Em* 11 07 37.7397076094 -77 35 30.798281267   23.7 22.2   17.03 ~ 38 0
51 V* HK Cha Or* 11 07 42.3440888366 -77 33 59.381952754   21.9 19.8   15.26 ~ 76 0
52 Ass Cha T 1-15 Or* 11 07 43.6609031154 -77 39 41.135416457   17.05 15.34   12.67 K5Ve 68 0
53 2MASS J11074656-7615174 Y*O 11 07 46.5885434456 -76 15 17.407167200         16.84 M5.75e 26 0
54 V* HL Cha Or* 11 07 52.2571569898 -77 36 57.045566163   21.5 19.51   15.07 ~ 45 0
55 RX J1108.2-7728 Y*O 11 07 55.775088 -77 27 25.52724   15.26 13.40 13.07 11.04 K3Ve 52 0
56 V* HM Cha Or* 11 07 57.2859502381 -77 17 26.245693013       20.9 17.14 M0.75-M1.75 35 0
57 Sz 23 Or* 11 07 58.0950734241 -77 42 41.351737085   15.8 18.04   14.63 M4Ve 59 0
58 CHXR 30A Y*O 11 07 59.9490505190 -77 17 30.542052824   21.8   18.3 15.78 K8 25 0
59 V* VW Cha Or* 11 08 01.3974165580 -77 42 28.579297348 13.91 14.04 12.80   10.69 K7+M0 169 0
60 ESO-HA 562 Or* 11 08 02.8818832663 -77 38 42.559049944     17.61   14.41 M0.5+M0.5 41 0
61 HD 97048 Ae* 11 08 03.3105687971 -77 39 17.491180130 9.03 8.76 9.00   8.64 A0Vep 467 0
62 Ass Cha T 1-19 Y*O 11 08 16.4935782089 -77 44 37.208594822   18.40 16.53   13.12 M4Ve 48 0
63 ISO-ChaI 137 Em* 11 08 17.0488242221 -77 44 11.882363175   20.4 18.51   14.34 M5.5e 25 0
64 ISO-ChaI 138 LM* 11 08 18.4678367177 -77 30 40.889960359         16.77 ~ 36 0
65 CHSM 12180 Em* 11 08 18.9689267002 -77 39 17.141407943   20.5 18.52   14.50 ~ 39 0
66 ISO-ChaI 143 Y*? 11 08 22.3644100400 -77 30 27.790600663         15.51 M5e 40 0
67 ISO-ChaI 144 Em* 11 08 24.1180053004 -77 41 47.441399459   21.3 19.18   14.85 ~ 46 0
68 ISO-ChaI 147 Y*? 11 08 26.4689399244 -77 15 55.081276798         16.81 M5.75 23 0
69 Ass Cha T 1-20 Or* 11 08 39.0278260669 -77 16 04.168315197   18.44 16.28 15.822 13.17 K5Ve 77 0
70 V* HQ Cha Or* 11 08 39.5016839836 -77 34 16.747297668   21.7 19.75   15.06 ~ 61 0
71 V* HR Cha Or* 11 08 54.1972544726 -77 32 11.662612572     19.1   15.01 M5.25e 35 0
72 V* VY Cha Or* 11 08 54.6053179733 -77 02 13.010307395   14.8     13.60 K8Ve 63 0
73 V* HS Cha Or* 11 08 54.9596817049 -76 32 41.150823907     20.12 18.616 16.650 M5.5e 31 0
74 CHX 13 X 11 08 55.7 -76 35 59           M0 19 0
75 Hn 7 Em* 11 09 05.1039937956 -77 09 58.032124285         13.96 M5e 22 0
76 Sz 30 TT* 11 09 11.72304 -77 29 12.4836   14.89 13.28 13.02 11.032 M2.5+M2 50 0
77 [CCE98] 1-74 TT* 11 09 17.6894816682 -76 27 57.916038219   15.48 13.92   11.72 K4Ve 40 0
78 V* HU Cha Or* 11 09 18.12888 -76 30 29.2500         14.99 M1/2e 47 0
79 V* HV Cha Or* 11 09 22.6506851116 -76 34 32.169764007         16.79 M0.75-M1.75 49 0
80 V* VZ Cha Or* 11 09 23.7736314968 -76 23 20.855918834   13.82 12.94   12.14 K7e 128 0
81 HJM C 5-3 Y*O 11 09 37.7438433247 -77 10 41.063177732         15.44 K7 15 0
82 CHX 15b Y*O 11 09 40.0554020707 -76 28 39.259268411   15.68 14.04   11.66 K8Ve 34 0
83 V* HW Cha Or* 11 09 41.9197773612 -76 34 58.597303951           M0- 32 0
84 HJM C 7-1 Y*O 11 09 42.5581655835 -77 25 57.930317904         15.91 ~ 34 0
85 HJM C 1-24 TT* 11 09 46.1867409078 -76 34 46.505353388   11.93 18.41   14.72 M3.25e 53 1
86 HD 97300 Ae* 11 09 50.0178181814 -76 36 47.711452436   9.41 9.20   8.82 B9V 162 1
87 ISO-ChaI 217 Y*O 11 09 52.1370847465 -76 39 12.880114192         16.63 ~ 43 0
88 ISO-ChaI 220 Y*O 11 09 53.3256952909 -77 28 36.636877998           M5.75 26 0
89 Ass Cha T 1-23 Or* 11 09 53.4191770981 -76 34 25.652662545   13.9 19.50 15.10 13.52 G9IIIe 81 0
90 V* HX Cha Or* 11 09 54.062760 -76 29 25.54332       16.08 14.03 M3.5+M7 62 0
91 HJM C 1-2 Or* 11 09 55.0057844533 -76 32 41.235293097         17.85 M0- 31 0
92 V* WX Cha Or* 11 09 58.666944 -77 37 09.03432   14.93 13.85 14.23 12.20 M1+M5 91 0
93 V* WW Cha Or* 11 10 00.0791962314 -76 34 57.971855660   14.74 14.10   10.95 ~ 133 0
94 HJM C 1-4 Y*O 11 10 03.6833471517 -76 33 29.222406347     18.78 16.1 14.72 K8e 53 0
95 V* WY Cha Or* 11 10 07.0323174364 -76 29 37.640377806   15.29 13.87   11.62 K8Ve 80 1
96 2MASS J11100785-7727480 Y*? 11 10 07.8409195036 -77 27 48.070710758         17.79 M5.5 29 0
97 HJM C 1-8 Y*O 11 10 11.3920788538 -76 35 29.251306607         13.75 K5Ve 50 0
98 CHXX 16 LM* 11 10 22.2510284067 -76 25 13.840839864         16.58 ~ 28 0
99 HJM C 6-2 Y*O 11 10 28.5074803567 -77 16 59.599068546     17.93   13.97 M3Ve 31 0
100 [LES2004] ChaI 405 TT* 11 10 34.7900577915 -77 22 05.254117743     20.9   15.61 M4 18 0
101 ISO-ChaI 250 LM* 11 10 36.4169296509 -77 22 13.101624548         16.52 M4.75 18 0
102 Glass Q Y*O 11 10 37.9009258039 -77 32 39.873598579   16.89 14.97   11.90 K5.5+K7 67 0
103 ISO-ChaI 252 Y*? 11 10 41.3837182099 -77 20 47.962681310     22.4 20.06 17.27 ~ 32 0
104 Ass Cha T 1-27 Or* 11 10 49.5666192333 -77 17 51.754825123   16.80 16.64   13.84 M4Ve 71 0
105 V* WZ Cha Or* 11 10 53.3208321416 -76 34 32.060346788   16.41 15.48   13.07 M4Ve 62 0
106 HJM C 2-5 Y*O 11 10 56.0147051732 -76 45 32.757909031         13.95 M6e 42 0
107 HJM E 4-7 LM* 11 11 22.6225833036 -77 05 53.888088814         14.02 M4Ve 17 0
108 HJM E 1-7 Or* 11 11 34.7529878525 -76 36 21.250012774   16.35 14.73   12.35 K8Ve 30 0
109 V* XX Cha Or* 11 11 39.6733333784 -76 20 15.037536625   16.67 15.28   12.56 M3Ve 99 1
110 CHX 18N TT* 11 11 46.3366412620 -76 20 08.947142071   13.27 11.96   10.37 K5IVe 61 1
111 CHX 18 X 11 11 49.8 -76 19 48           ~ 61 1
112 Hn 15 Y*O 11 11 54.024360 -76 19 30.93132   16.02 14.37 13.98 11.88 M2.5+M3.5 22 1
113 HJM E 1-10 Y*O 11 12 03.2797581554 -76 37 03.244993895         13.97 M5.5e 27 0
114 Sz 40 Or* 11 12 09.8315145785 -76 34 36.496433593   15.2     13.41 M4.5Ve 52 0
115 Sz 41 TT* 11 12 24.3971939698 -76 37 06.179976409   11.2 11.60   10.22 K7+M2.5 92 1
116 V* CV Cha Or* 11 12 27.7052551478 -76 44 22.298597430   12.02 10.98 10.51 9.76 G9Ve 177 1
117 V* CW Cha Or* 11 12 30.9287857153 -76 44 24.000743749   15.75 14.45 15.19 13.60 ~ 55 1
118 CHX 21 X 11 12 42.10 -76 58 40.0           M1 21 0
119 Ass Cha T 2-54 TT* 11 12 42.6696152636 -77 22 22.928829312     11.103   9.653 G8+K7 80 2
120 HJM E 1-8 TT* 11 12 42.9823393023 -76 37 04.866099514         10.95 K3Ve 29 0
121 HJM E 4-4 Y*O 11 13 20.1445742357 -77 01 04.444011775   16.17 14.63   12.31 M2.75 23 0
122 Hn 18 Y*O 11 13 24.4527724500 -76 29 22.875007645         13.51 M4Ve 35 0
123 HJM E 1-4 Y*O 11 13 27.3698112219 -76 34 16.644118218   15.96 14.35   12.10 K8Ve 26 0
124 CHXR 60 X 11 13 28.0 -76 29 10           M4.25 21 0
125 Hn 19 Y*O 11 13 29.6966247744 -76 29 01.382016585         13.42 M4Ve 26 0
126 Sz 44 Or* 11 13 33.5605868629 -76 35 37.465480024   15.4     13.59 M4Ve 29 0
127 Hn 20 Y*O 11 14 15.5412946530 -76 27 36.573467035         13.24 M4Ve 25 0
128 Hn 21W Y*O 11 14 24.5185372817 -77 33 06.401221475     18.20   14.24 M4e 29 0
129 Hn 21E Y*O 11 14 26.1053639615 -77 33 04.435007028     20.7   15.47 M6e 12 0
130 Ass Cha T 1-32 Y*O 11 17 36.9756500866 -77 04 38.121286249   13.1 13.50   11.78 M0.5e 76 0
131 CHXR 68B * 11 18 19.5917357145 -76 22 01.436057748   16.46 14.80     M2e 12 0
132 CHXR 68 Y*O 11 18 20.24 -76 21 57.6           ~ 8 0
133 CHXR 68A * 11 18 20.2671732411 -76 21 57.734321272   14.22 12.75 12.51 10.96 K4Ve 18 0
134 NAME Upper Sco Association As* 16 12 -23.4           ~ 1086 1
135 NAME ASSOC II SCO As* 16 15 -24.2           ~ 1160 1
136 NAME Ophiuchus Molecular Cloud SFR 16 28 06 -24 32.5           ~ 3138 1
137 GCIRS 6 * 17 45 39.5 -29 00 27           ~ 36 0
138 HD 164296 * 18 01 55.2633093576 -34 08 10.381679581   10.05 9.44     G3V 20 0
139 NAME Upper Scorpius A As* ~ ~           ~ 16 0
140 CHXR 18N * ~ ~     12.05     K1 2 0

    Equat.    Gal    SGal    Ecl

To bookmark this query, right click on this link: simbad:objects in 2008ApJ...683..844L and select 'bookmark this link' or equivalent in the popup menu


2021.03.05-16:30:03

© Université de Strasbourg/CNRS

    • Contact