2009AJ....138.1193C


Query : 2009AJ....138.1193C

2009AJ....138.1193C - Astron. J., 138, 1193-1202 (2009/November-0)

An adaptive optics survey for close protostellar binaries.

CONNELLEY M.S., REIPURTH B. and TOKUNAGA A.T.

Abstract (from CDS):

In order to test the hypothesis that Class I protostellar binary stars are a product of ejections during the dynamical decay of nonhierarchical multiple systems, we combined the results of new adaptive optics (AO) observations of Class I protostars with our previously published AO data to investigate whether Class I protostars with a widely separated companion (r > 200 AU) are more likely to also have a close companion (r < 200 AU). In total, we observed 47 embedded young stellar objects (YSOs) with either the Subaru natural guide star AO system or the Keck laser guide star AO system. We found that targets with a widely separated companion within 5000 AU are not more likely to have a close companion. However, targets with another YSO within a projected separation of 25,000 AU are much more likely to have a close companion. Most importantly, every target with a close companion has another YSO within a projected separation of 25,000 AU. We came to the same conclusions after considering a restricted sample of targets within 500 pc and close companions wider than 50 AU to minimize incompleteness effects. The Orion star-forming region was found to have an excess of both close binaries and YSOs within 25,000 AU compared to other star-forming regions. We interpret these observations as strong evidence that many close Class I binary stars form via ejections and that many of the ejected stars become unbound during the Class I phase.

Abstract Copyright:

Journal keyword(s): binaries: visual - instrumentation: adaptive optics - stars: formation

CDS comments: In table 1 IRAS F22324+4024 not identified.

Simbad objects: 45

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Number of rows : 45
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
#notes
1 2MASS J00014325+4805189 Y*O 00 01 43.2460939104 +48 05 18.914967708           G7-M4 6 0
2 IRAS 03301+3111 Y*O 03 33 12.8440487256 +31 21 24.139522188           M1.8 61 0
3 NAME Perseus Cloud SFR 03 35.0 +31 13           ~ 1291 0
4 NAME Per Region reg 03 37 00.0 +31 15 00           ~ 261 0
5 NAME Auriga reg 04 20 00.0 +38 05 00           ~ 196 0
6 V* FS Tau Or* 04 22 02.1798627024 +26 57 30.575293308 17.57   14.10 15.63   M3.5e+M0e 278 0
7 V* DG Tau Or* 04 27 04.6921275888 +26 06 16.060169268 13.57 13.97 10.50 12.28   K6Ve 1010 1
8 NAME Taurus Complex SFR 04 41.0 +25 52           ~ 4175 0
9 V* V347 Aur Or* 04 56 57.0215559600 +51 30 50.884005672           M2Ve 40 1
10 IRAS 05289-0430 Y*O 05 31 27.1038134712 -04 27 59.574965436     16.7     ~ 11 0
11 Haro 4-145 Y*O 05 32 43.4178525432 -05 35 57.290459748     16.8     M1.7 47 0
12 NAME Orion Nebula Cluster OpC 05 35.0 -05 29           ~ 2238 1
13 [MGR2000a] IRAS 00494+5617 P1 HII 05 35 14.4 -04 55 45           ~ 38 0
14 M 42 OpC 05 35 17 -05 23.4           ~ 3999 0
15 Parenago 2649 Ae* 05 38 09.3040171896 -06 49 16.595034888   15.361 13.860 13.438   A5e 64 0
16 Haro 5-90 Y*O 05 40 06.7915206744 -00 38 38.115960216     16.1 15.76   G3-K5 13 0
17 NAME LDN 1641 S4 mul 05 40 48.8 -08 06 51           ~ 43 0
18 NGC 2024 Cl* 05 41 43 -01 50.5           ~ 1129 1
19 2MASS J05424769-0947222 Y*O 05 42 47.6957901456 -09 47 22.318522692           A5-F3 21 0
20 V* V1818 Ori Ae* 05 53 42.5559205608 -10 24 00.727634016     13.40     Ae 39 0
21 2MASS J05574947-1405336 Y*O 05 57 49.4713881960 -14 05 33.602900028       14.18   B5? 18 0
22 IRAS 05555-1405 mul 05 57 49.6 -14 05 42           ~ 18 0
23 IRAS 06297+1021 Y*O 06 32 28.7 +10 19 03           ~ 9 0
24 IRAS 06382+1017 Y*O 06 41 02.660 +10 15 01.91           ~ 50 0
25 IRAS 07025-1204 Cld 07 04 52.4 -12 09 26           ~ 18 0
26 IRAS 08043-3343 IR 08 06 15.6 -33 52 18           ~ 4 0
27 * rho Oph ** 16 25 35.11766 -23 26 49.8150 4.30 4.85 4.63 4.27 3.96 B2IV+B2V 636 0
28 GSS 35 TT* 16 26 34.1761719864 -24 23 28.283473860     16.53 14.75 12.51 B3 231 1
29 NAME Ophiuchus Molecular Cloud SFR 16 28 06 -24 32.5           ~ 3497 1
30 HBC 650 TT* 16 34 29.32 -15 47 01.4           K3.0 174 2
31 EM* MWC 297 Ae* 18 27 39.5265500160 -03 49 52.133050776 15.57 14.34 12.31 11.34   B1.5Ve 289 0
32 IRAS 18275+0040 Y*O 18 30 06.1720554216 +00 42 33.552210636   17.27 15.55 13.34   F3Ve 25 0
33 IRAS 18383+0059 IR 18 40 51.7 +01 02 09           ~ 6 0
34 IRAS 19247+2238 PN? 19 26 51.33216 +22 45 13.4496           ~ 3 0
35 Parsamian 21 Or* 19 29 00.8740757136 +09 38 42.862226208   15.18 14.07 13.93   F5Iabe 88 0
36 LDN 1100 Y*O 20 36 22.86 +63 53 40.4           ~ 31 0
37 V* PV Cep Or* 20 45 53.9540390184 +67 57 38.679941304   19.27 17.46 15.98 14.60 A5 266 3
38 V* V2494 Cyg Or* 20 58 21.0933404928 +52 29 27.683055312           ~ 44 0
39 RNO 129 Y*O 20 59 14.08512 +78 23 04.0020       15.30   G:e 46 1
40 IRAS 21007+4951 mul 21 02 22.9 +50 03 06           ~ 26 0
41 [G85] 12 CGb 21 40 29.5 +56 35 33           ~ 63 0
42 IRAS 21445+5712 Y*O 21 46 07.1269843296 +57 26 31.628449824           ~ 49 0
43 V* V1735 Cyg Or* 21 47 20.6628414360 +47 32 03.857457372           ~ 157 0
44 GLMP 1049 Y*O 21 58 35.90 +58 57 22.8           ~ 13 0
45 IRAS 22376+7455 TT* 22 38 42.5032929744 +75 11 45.489819660   17.65 16.10 14.90 13.62 M1.5 48 0

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2023.05.29-17:58:35

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