1997A&A...326..329L

Query : 1997A&A...326..329L

1997A&A...326..329L - Astronomy and Astrophysics, volume 326329-346 (1997/10-1)

Millimetre dust emission from northern Bok globules.

LAUNHARDT R. and HENNING T.

Abstract (from CDS):

We present the results of a 1.3mm continuum study of 59 Bok globules located north of -30° declination. The catalogue of Clemens & Barvainis (1988ApJS...68..257C) served as a search list for the target objects investigated here. Based on the analysis of the IRAS point source colour-colour diagram, four distinct groups of globules are distinguished. It is shown that indeed each of these groups has distinctive properties and represents a different stage of star formation. For our observations, we selected a number of candidate pre-protostellar cores, all candidates for globules with protostellar cores, as well as a number of strong 12µm IRAS point sources which are candidates for T Tauri stars associated with globules. Individual distances of the globules are derived with a method which associates the globules with larger molecular cloud complexes. It is shown that most globules are associated with such cloud complexes from which they probably formed. The derived distances range from 140pc to 2kpc with the majority of the globules being related to Gould's Belt at distances of 200 to 300pc. The average distance of our sample of globules is derived to be 500pc. Out of the 59 globule cores observed at 1.3mm, 21 objects were detected with average 3σ detection limits of 17mJy/12" and 39mJy/23". This corresponds to an overall detection rate of 35%. While most of the detected objects are protostellar cores, four pre-protostellar cores and one T Tauri star were detected furthermore. The typical mass of a star formed in a Bok globule is derived to be ≃0.5M☉. Using the detection rates and the relative frequencies of the globule groups, lifetimes of the different evolutionary stages are derived. Assuming that all globules form stars at some time of their evolution, the typical lifetime of a Bok globule is derived to be some 106years. It is speculated that the existence of isolated T Tauri stars can be explained by star formation in Bok globules. In addition, the results of the continuum measurements are compared with observations of different molecular lines.

Abstract Copyright: ∼

Journal keyword(s): circumstellar matter - stars: formation - ISM: clouds - dust, extinction - radio continuum: ISM

Nomenclature: Table 1: [CB88] NNN-N N=13

Simbad objects: 123

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Number of rows : 123
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 IRAS 00259+5625 Y*? 00 28 41.64408 +56 41 52.6956           ~ 29 1
2 LBN 119.83-06.05 MoC 00 28 43.5075 +56 41 56.868           ~ 72 0
3 IRAS 00465+5028 * 00 49 25.0 +50 44 45           ~ 19 1
4 LBN 122.71-12.11 MoC 00 49 29 +50 44.6           ~ 29 0
5 [DB2002b] G127.88+2.67 MoC 01 38 37 +65 05.2           ~ 11 0
6 IRAS 01354+6447 FIR 01 38 56.8 +65 03 12           ~ 7 0
7 IRAS 04005+5647 FIR 04 04 33.7 +56 56 10           ~ 10 0
8 LDN 1389 MoC 04 04 38 +56 56.2           ~ 99 0
9 RAFGL 5123 Y*O 04 31 34.07736 +18 08 04.9020           K3V/M3III 900 0
10 LDN 1503 DNe 04 40.4 +29 56           ~ 25 0
11 LDN 1507 MoC 04 43 32 +29 40.0           ~ 37 0
12 IRAS 04559+5200 FIR 04 59 52.4 +52 04 45           ~ 13 0
13 LDN 1439 DNe 05 00 09 +52 04.9           ~ 103 0
14 IRAS 05440+2059 IR 05 47 01.77 +21 00 25.2           ~ 24 2
15 [CB88] 34 MoC 05 47 02.3 +21 00 10           ~ 64 0
16 HD 250550 Ae* 06 01 59.9892055464 +16 30 56.727549864   9.60 9.593 9.64   B9e 254 1
17 [DB2002b] G192.63-3.05 MoC 06 02 00 +16 31.0           ~ 29 0
18 LDN 1578 DNe 06 08 55 +17 50.4           ~ 13 0
19 [DB2002b] G192.28-0.95 MoC 06 08 55 +17 50.4           ~ 19 0
20 NGC 2296 RNe 06 48 39.11 -16 54 05.8   13.6   13.9 13.9 ~ 14 0
21 [DB2002b] G227.77-8.20 MoC 06 48 43 -16 53.4           ~ 20 0
22 LBN 1042 HII 07 04 17 -16 24.5           ~ 11 0
23 [CB88] 54 MoC 07 04 21.2170 -16 23 15.000           ~ 53 0
24 IRAS 07020-1618 Y*O 07 04 21.566 -16 23 19.75           ~ 24 1
25 [CB88] 58-2 MoC 07 18 07.67 -23 41 06.9           ~ 5 0
26 [DB2002b] G236.96-5.04 MoC 07 18 13 -23 38.8           ~ 16 0
27 IRAS 07161-2336 IR 07 18 15.2 -23 41 42           ~ 7 0
28 LDN 1670 MoC 08 04 36.9 -31 30 44           ~ 17 0
29 NAME VLA 1623-243 Y*O 16 26 26.42 -24 24 30.0           ~ 429 0
30 [SSG2006] MMS002 smm 16 26 26.50 -24 24 30.9           ~ 241 0
31 LDN 31 DNe 16 50 27 -19 07.3           ~ 19 0
32 HD 151925 * 16 51 10.2598866744 -19 11 12.067527588   9.31 8.00     K0/1III 13 0
33 LDN 146 MoC 16 57 17.5 -16 09 18           ~ 89 1
34 IRAS 16544-1604 Y*O 16 57 19.626 -16 09 23.30           ~ 53 1
35 [DB2002b] G351.19+5.20 MoC 17 02 20 -33 16.6           ~ 12 0
36 LDN 1679 MoC 17 02 44 -33 16.4           ~ 16 0
37 [CB88] 69-2 MoC 17 02 47.2 -33 15 30           ~ 1 0
38 IRAS 16595-3311 Mi* 17 02 49.0368861048 -33 15 30.592754784         15.437 ~ 8 0
39 LDN 173 DNe 17 17.4 -18 31           ~ 15 0
40 LDN 101 DNe 17 21 50 -21 48.4           ~ 5 0
41 PN M 3-40 PN 17 22 28.2905114736 -27 08 42.369295200           ~ 71 0
42 IRAS 17194-2351 Mi* 17 22 31.0205564328 -23 53 48.724660716         11.320 ~ 8 1
43 LDN 1774 DNe 17 22 34 -27 05.3           ~ 20 0
44 LDN 57 DNe 17 22 38.2 -23 49 34           ~ 336 1
45 LDN 55 DNe 17 23.0 -23 53           ~ 15 0
46 LDN 109 DNe 17 39.1 -24 07           ~ 8 0
47 LDN 226 DNe 17 40 43 -19 39.5           ~ 8 0
48 LDN 233 DNe 17 45.1 -20 01           ~ 8 0
49 LDN 235 DNe 17 46.5 -20 11           ~ 9 0
50 [DB2002b] G7.55+4.26 MoC 17 46 47 -20 16.6           ~ 5 0
51 [CB88] 97-2 MoC 17 46 51.3 -20 18 49           ~ 1 0
52 IRAS 17438-2017 Mi* 17 46 51.5550516408 -20 18 46.343800476         14.610 ~ 5 0
53 [DB2002b] G7.38+4.10 MoC 17 47 01 -20 30.5           ~ 7 0
54 IRAS 17597-2754 Mi* 18 02 52.3400366256 -27 54 30.994389540         14.474 ~ 6 0
55 [CB88] 107-1 MoC 18 02 52.5 -27 54 31           ~ 2 0
56 HD 164562 * 18 02 54.2970992760 -27 49 35.991455412   8.39 6.69     K4III 12 0
57 [CB88] 107-2 MoC 18 02 54.5 -27 49 38           ~ 1 0
58 LDN 93 DNe 18 02 58 -27 52.1           ~ 23 0
59 LDN 262 DNe 18 03 06 -20 52.1           ~ 25 0
60 IRAS 18001-2053 LP? 18 03 07.3755191040 -20 52 59.700172116           ~ 4 0
61 LDN 307 DNe 18 05 55 -18 25.2           ~ 11 0
62 IRAS 18032-1826 Mi* 18 06 11.5430640528 -18 26 30.756598512         15.442 ~ 7 1
63 [DB2002b] G8.42-2.06 MoC 18 12 14 -22 40.3           ~ 5 0
64 IRAS 18093-2241 LP* 18 12 20.1404650560 -22 40 35.215189320           ~ 4 0
65 [DB2002b] G8.35-2.12 MoC 18 12 21 -22 45.3           ~ 4 0
66 [CB88] 116-2 MoC 18 12 31.9 -22 46 06           ~ 1 0
67 IRAS 18095-2246 LP* 18 12 33.4863840216 -22 46 04.920383172           ~ 5 0
68 [CB88] 126 MoC 18 15 17 -03 45.6           ~ 3 0
69 LDN 490 DNe 18 15 19 -03 45.7           ~ 11 0
70 LDN 323 DNe 18 15.5 -18 13           ~ 30 0
71 [CB88] 125-2 MoC 18 15 42.1 -18 02 35           ~ 1 0
72 IRAS 18127-1803 LP? 18 15 42.4479184128 -18 02 33.293695488           ~ 4 0
73 LDN 507 MoC 18 16 15 -02 32.8           ~ 32 0
74 LDN 327 DNe 18 16.9 -18 04           ~ 18 0
75 LDN 328 DNe 18 17 00 -18 01.9           ~ 52 0
76 TYC 6277-1157-1 * 18 23 21.3073485504 -20 45 51.964485624   13.81 10.86     ~ 4 0
77 [CB88] 135-1 MoC 18 23 21.6 -20 45 45           ~ 1 0
78 LDN 306 DNe 18 23 32 -20 45.6           ~ 9 0
79 LDN 415 DNe 18 24.8 -10 38           ~ 6 0
80 LDN 414 DNe 18 24 56.0 -10 53 28           ~ 8 0
81 IRAS 18225-1043 LP? 18 25 18.1820536272 -10 41 28.317368400           ~ 3 0
82 LDN 416 DNe 18 25 30 -10 39.2           ~ 8 0
83 [DB2002b] G18.32-1.53 MoC 18 29 54 -13 41.2           ~ 18 0
84 IRAS 18272-1343 Mi* 18 30 02.2384093440 -13 41 00.769588368         13.522 ~ 7 0
85 LDN 356 DNe 18 30 23.4 -17 41 10           ~ 9 0
86 IRAS 18296-0911 Mi* 18 32 20.6795237352 -09 09 15.232177080         11.672 ~ 10 0
87 LDN 443 DNe 18 32 42.6 -09 04 43           ~ 14 0
88 LDN 532 DNe 18 47.1 -04 22           ~ 22 0
89 IRAS 18445-0440 MoC 18 47 15.0 -04 37 22           ~ 3 0
90 [CB88] 155-2 MoC 18 47 20.5 -04 31 54           ~ 1 0
91 IRAS 18446-0435 mul 18 47 20.5 -04 31 54           ~ 2 0
92 IRAS 19018-0525 FIR 19 04 30.2 -05 21 01           ~ 5 0
93 [DB2002b] G29.66-5.36 MoC 19 04 37 -05 21.0           ~ 16 0
94 IRAS 19116+1623 Mi* 19 13 56.5783962960 +16 28 30.205255044         14.897 ~ 13 1
95 IRAS 19179+1129 Y*? 19 20 14.9431913808 +11 35 40.015380696           ~ 14 0
96 [CB88] 188 cor 19 20 15.6 +11 36 15           ~ 37 0
97 LDN 767 MoC 19 20 44.0 +11 28 55           ~ 2 0
98 IRAS 19183+1123 LP* 19 20 44.2526688192 +11 28 59.630927700           ~ 6 0
99 [CB88] 189-3 MoC 19 20 45.6 +11 23 50           ~ 1 0
100 IRAS 19184+1118 LP* 19 20 45.7549191696 +11 23 53.453604984           ~ 8 0
101 LDN 676 DNe 19 21 17 +11 33.9           ~ 9 0
102 LDN 709 DNe 19 31 52 +16 27.2           ~ 19 0
103 LDN 810 DNe 19 45 23.8630 +27 50 57.840           ~ 62 0
104 NAME LDN 810 IRS HII 19 45 23.9 +27 50 58           ~ 22 0
105 IRAS 20018+2629 MIR 20 03 58.63608 +26 38 24.0792           ~ 5 0
106 TGU H416 MoC 20 03 59 +26 38.2           ~ 12 0
107 LDN 814 DNe 20 04 00 +26 39.2           ~ 6 0
108 LDN 797 MoC 20 05 47 +23 26.3           ~ 19 0
109 IRAS 20037+2317 IR 20 05 53.5 +23 26 34           ~ 7 0
110 LDN 1094 DNe 20 33 31 +64 01.4           ~ 12 0
111 IRAS 20328+6351 FIR 20 33 36.4 +64 02 21           ~ 5 0
112 LDN 1100 Y*O 20 36 22.86 +63 53 40.4           ~ 34 0
113 [DB2002b] G93.90+7.60 MoC 20 51 20 +56 15.7           ~ 36 0
114 LDN 1177 DNe 21 17 38.62 +68 17 34.0           ~ 95 1
115 [DB2002b] G93.46-12.63 MoC 22 13 23 +41 01.5           ~ 10 0
116 IRAS 22317+5816 IR 22 33 38.9088996888 +58 31 55.196195340           ~ 12 1
117 LDN 1192 DNe 22 33 48 +58 33.5           ~ 29 0
118 LDN 1225 DNe 23 11 58 +61 39.0           ~ 15 0
119 LDN 1246 DNe 23 25 05.7 +63 36 34           ~ 34 0
120 PSCz Q23238+7401 Y*O 23 25 46.65 +74 17 37.2           ~ 61 1
121 LDN 1262 MoC 23 25 47 +74 17.6           ~ 136 0
122 LDN 1253 DNe 23 56 32 +58 31.7           ~ 56 0
123 NAME Vul B Cld ~ ~           ~ 10 0

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