2012A&A...537A...4M

Query : 2012A&A...537A...4M

2012A&A...537A...4M - Astronomy and Astrophysics, volume 537A4-4 (2012/1-1)

Tracing the evolutionary stage of Bok globules: CCS and NH3.

MARKA C., SCHREYER K., LAUNHARDT R., SEMENOV D.A. and HENNING T.

Abstract (from CDS):

We investigate a previously proposed correlation between the chemical properties and the physical evolutionary stage of isolated low-mass star-forming regions. The NNH3/NCCS abundance ratio has been proposed to be a potentially useful indicator of the evolutionary stage of cloud cores, and we study its applicability for isolated Bok globules. We searched for CCS(21-10) emission in 42 Bok globules both with and without signs of current star formation. A set of NH3 measurements was compiled from measurements available in the literature and from our own observations. The abundance ratio of both molecules is discussed with respect to the evolutionary stage of the objects and in the context of chemical models. We determine the NNH3/NCCS ratio for 18 Bok globules and find that it is moderately high and roughly similar across all evolutionary stages from starless and prestellar cores towards internally heated cores harboring protostars of Class 0, Class I, or later. We do not find any Bok globules with extremely high CCS abundances analogous to carbon-chain producing regions in dark cloud cores. The observed range of NNH3/NCCS implies that all of the observed Bok globules are in a relatively evolved chemical state.

Abstract Copyright: ∼

Journal keyword(s): ISM: clouds - stars: formation - ISM: molecules - radio lines: ISM

Simbad objects: 78

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Number of rows : 78
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 NAME Perseus Cloud SFR 03 35.0 +31 13           ~ 1553 0
8 IRAS 04005+5647 FIR 04 04 33.7 +56 56 10           ~ 10 0
9 LDN 1389 MoC 04 04 38 +56 56.2           ~ 99 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 [CB88] 28 MoC 05 06 16.0 -03 56 29           ~ 22 0
15 IRAS 05038-0400 FIR 05 06 19.9 -03 56 33           ~ 5 0
16 IRAS 05440+2059 IR 05 47 01.77 +21 00 25.2           ~ 24 2
17 [CB88] 34 MoC 05 47 02.3 +21 00 10           ~ 64 0
18 LDN 1570 DNe 06 07 28.4 +19 28 04           ~ 46 0
19 IRAS 06047+1923 MIR 06 07 38.6605285824 +19 22 42.041939952           ~ 3 0
20 [DB2002b] G255.30-14.35 DNe 07 16 01 -43 57.7           ~ 18 1
21 IRAS 07144-4352 FIR 07 16 01.1 -43 58 04           ~ 7 0
22 CG 16 CGb 07 27 36.4 -51 04 44           ~ 16 0
23 CG 30 CGb 08 09 32.8 -36 05 00           ~ 136 0
24 2MASS J08254384-5100326 Y*O 08 25 43.85 -51 00 32.7           ~ 327 1
25 NAME ESO 210- 6A MoC 08 25 44 -51 02.1           ~ 40 1
26 IRAS 08250-5030 FIR 08 26 31.7 -50 40 30           ~ 11 0
27 BHR 34 MoC 08 26 34 -50 39.9           ~ 19 0
28 IRAS 08261-5100 MoC 08 27 38.9 -51 10 38           ~ 30 0
29 V* AT Pyx Or* 08 28 40.6971900120 -33 46 22.290118356     12.7     K2.0 35 1
30 [DB2002b] G253.60+2.94 MoC 08 28 44.0 -33 45 12           ~ 34 0
31 IRAS 08337-4028 MIR 08 35 31.00392 -40 38 24.8604           ~ 21 0
32 IRAS 08339-4029 MoC 08 35 44.0 -40 40 23           ~ 3 1
33 IRAS 09449-5052 FIR 09 46 45.2 -51 06 02           ~ 7 0
34 BHR 55 MoC 09 46 51 -51 06.4           ~ 16 0
35 [DB2002b] G291.05-1.65 MoC 11 07 07 -62 05.8           ~ 17 0
36 [B2001b] IRS 1 Y*O 12 01 36.53040 -65 08 51.9180           ~ 167 0
37 BHR 71 MoC 12 01 37 -65 08.8           ~ 163 0
38 NAME BHR 71 MM HII 12 01 37.1 -65 08 54           ~ 47 0
39 BHR 74 MoC 12 22 09 -66 27.1           ~ 8 0
40 Sandqvist 160 DNe 13 06.9 -77 01           ~ 42 0
41 PSCz Q13036-7644 Y*O 13 07 36.89 -77 00 09.7           ~ 41 1
42 BHR 111 MoC 15 42 20 -52 49.1           ~ 17 0
43 LDN 146 MoC 16 57 17.5 -16 09 18           ~ 89 1
44 IRAS 16544-1604 Y*O 16 57 19.626 -16 09 23.30           ~ 53 1
45 [DB2002b] G337.09-4.90 MoC 16 58 42 -50 35.8           ~ 11 0
46 IRAS 16549-5030 IR 16 58 51.5 -50 35 30           ~ 5 0
47 IRAS 16554-5031 * 16 59 20.5757030544 -50 35 32.815397832           ~ 5 0
48 [DB2002b] G349.03+3.02 MoC 17 04 26 -36 18.8           ~ 8 0
49 IRAS 17011-3613 IR 17 04 31.1 -36 18 21           ~ 7 0
50 IRAS 17159-4324 FIR 17 19 30.0111674328 -43 27 06.775054488           ~ 4 0
51 BHR 138 MoC 17 19 36 -43 27.1           ~ 7 0
52 BHR 139 MoC 17 20 45 -43 20.5           ~ 7 0
53 [SYS98] 171716.1-431655 Y*O 17 20 51.7 -43 19 52           ~ 8 0
54 IRAS 17181-4405 IR 17 21 46.9 -44 08 42           ~ 11 0
55 BHR 137 MoC 17 21 48 -44 08.8           ~ 7 0
56 IRAS 17193-4319 IR 17 22 54.8 -43 22 13           ~ 8 0
57 [DB2002b] G345.38-3.98 MoC 17 22 55 -43 22.6           ~ 12 0
58 IRAS 18121-1813 AB* 18 15 02.58696 -18 12 14.3244           ~ 4 0
59 IRAS 18122-1818 * 18 15 10.27080 -18 17 32.1936           ~ 6 0
60 IRAS 18126-1820 Y*? 18 15 28.96416 -18 19 14.3760           ~ 4 0
61 LDN 323 DNe 18 15.5 -18 13           ~ 30 0
62 IRAS 18127-1803 LP? 18 15 42.4479184128 -18 02 33.293695488           ~ 4 0
63 IRAS 18130-1824 FIR 18 16 01.857 -18 23 08.60           ~ 4 0
64 IRAS 19018-0525 FIR 19 04 30.2 -05 21 01           ~ 5 0
65 [DB2002b] G29.66-5.36 MoC 19 04 37 -05 21.0           ~ 16 0
66 IRAS 19179+1129 Y*? 19 20 14.9431913808 +11 35 40.015380696           ~ 14 0
67 [CB88] 188 cor 19 20 15.6 +11 36 15           ~ 37 0
68 LDN 1094 DNe 20 33 31 +64 01.4           ~ 12 0
69 IRAS 20328+6351 FIR 20 33 36.4 +64 02 21           ~ 5 0
70 LDN 1100 Y*O 20 36 22.86 +63 53 40.4           ~ 34 0
71 NGC 7027 PN 21 07 01.571952 +42 14 10.47120   10.358 8.831 10.157   ~ 2541 1
72 LDN 1177 DNe 21 17 38.62 +68 17 34.0           ~ 95 1
73 TGU H534 P2 DNe 21 37 11.3100 +43 20 36.260           ~ 29 0
74 IRAS 21352+4307 Y*O 21 37 11.39 +43 20 38.4           ~ 22 1
75 LDN 1246 DNe 23 25 05.7 +63 36 34           ~ 34 0
76 PSCz Q23238+7401 Y*O 23 25 46.65 +74 17 37.2           ~ 61 1
77 LDN 1262 MoC 23 25 47 +74 17.6           ~ 136 0
78 LDN 1253 DNe 23 56 32 +58 31.7           ~ 56 0

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