2008A&A...479..751T

Query : 2008A&A...479..751T

2008A&A...479..751T - Astronomy and Astrophysics, volume 479, 751-760 (2008/3-1)

The circumstellar environment of high-mass protostellar objects. IV. C17O observations and depletion.

THOMAS H.S. and FULLER G.A.

Abstract (from CDS):

The presence of depletion (freeze-out) of CO around low-mass protostars is well established. Here we observe 84 candidate young high-mass sources in the rare isotopologues C17O and C18O to investigate whether there is evidence for depletion towards these objects. Observations of the J=2->1 transitions of C18O and C17O are used to derive the column densities of gas towards the sources and these are compared with those derived from submillimetre continuum observations. The derived fractional abundance suggests that the CO species show a range of degrees of depletion towards the objects. We then use the radiative transfer code RATRAN to model a selection of the sources to confirm that the spread of abundances is not a result of assumptions made when calculating the column densities. We find a range of abundances of C17O that cannot be accounted for by global variations in either the temperature or dust properties and so must reflect source to source variations. The most likely explanation is that different sources show different degrees of depletion of the CO. Comparison of the C17O linewidths of our sources with those of CS presented by other authors reveal a division of the sources into two groups. Sources with a CS linewidth >3km/s have low abundances of C17O while sources with narrower CS lines have typically higher C17O abundances. We suggest that this represents an evolutionary trend. Depletion towards these objects shows that the gas remains cold and dense for long enough for the trace species to deplete. The range of depletion measured suggests that these objects have lifetimes of 2-4x105-years.

Abstract Copyright: ∼

Journal keyword(s): ISM: molecules - line: profiles - stars: abundances - stars: evolution - stars: formation

Simbad objects: 115

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Number of rows : 115
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024 		#notes
1 NAME Taurus Complex SFR 04 41.0 +25 52           ~ 4416 0
2 IRAS 05358+3543 Y*O 05 39 09.92 +35 45 17.2           ~ 164 0
3 WFS 1 smm 05 39 10.8 +35 45 16           ~ 2 0
4 WFS 3 smm 05 52 11.0 +27 00 34           ~ 3 0
5 WFS 4 smm 05 52 12.1 +27 00 11           ~ 3 0
6 IRAS 05490+2658 Y*O 05 52 12.9 +26 59 33           ~ 49 0
7 GAL 192.16-03.82 HII 05 58 13.4 +16 32 00           ~ 143 1
8 WFS 7 smm 18 11 45.2 -17 30 43           ~ 2 0
9 GAL 012.89+00.49 HII 18 11 51.3 -17 31 29           ~ 184 0
10 AGAL G012.888+00.489 cor 18 11 51.52 -17 31 28.9           ~ 37 0
11 WFS 11 smm 18 11 57.0 -17 29 34           ~ 2 0
12 OH 012.03-00.04 Y*O 18 12 01.8400 -18 31 55.800           ~ 82 0
13 IRAS 18102-1800 HII 18 13 12.2 -17 59 35           ~ 23 0
14 IRAS 18151-1208 Y*O 18 17 58.1254 -12 07 24.893           ~ 106 0
15 IRAS 18159-1550 HII 18 18 47.30 -15 48 57.9           ~ 26 0
16 EGO G016.59-0.05 HII 18 21 07.9 -14 31 53           ~ 117 0
17 OH 016.59-00.05 Mas 18 21 09.0840 -14 31 48.556           ~ 81 0
18 HIGALBM G018.6544-00.0592 cor 18 25 10.53 -12 42 25.8           ~ 9 0
19 IRAS 18223-1243 Y*O 18 25 10.9307288448 -12 42 15.754722912           ~ 61 1
20 MMB G019.755-00.128 Y*O 18 27 31.66 -11 45 55.0           ~ 51 0
21 MMB G019.884-00.534 cor 18 29 14.37 -11 50 23.0           ~ 105 1
22 WFS 20 smm 18 30 02.2 -12 15 40           ~ 2 0
23 [BNM96] 019.605-0.902 HII 18 30 02.7 -12 15 27           ~ 16 0
24 IRAS 18272-1217 Y*O 18 30 02.77248 -12 15 22.4172           ~ 18 0
25 AGAL G019.606-00.901 cor 18 30 02.810 -12 15 17.70           ~ 14 0
26 WFS 22 smm 18 31 43.4 -09 22 26           ~ 8 0
27 HIGALBM G022.3562+00.0668 cor 18 31 43.93 -09 22 13.3           ~ 7 0
28 GAL 022.357+00.066 HII 18 31 44.9 -09 22 09           ~ 45 0
29 AGAL G023.252+00.104 Y*O 18 33 17.3 -08 33 28           ~ 16 0
30 AGAL G023.264+00.077 cor 18 33 24.00 -08 33 31.0           ~ 41 0
31 IRAS 18310-0825 HII 18 33 47.9 -08 23 52           ~ 31 0
32 RAFGL 5515 HII 18 36 29.0 -07 40 33           ~ 30 0
33 AGAL G025.409+00.106 cor 18 37 16 -06 38.6           ~ 53 0
34 IRAS 18348-0616 Y*O 18 37 30.420 -06 14 14.49   17.34 16.14 14.80   ~ 36 0
35 GAL 026.60-00.02 HII 18 39 55.9 -05 38 45           ~ 32 1
36 AGAL G027.184-00.081 cor 18 41 13.26 -05 08 57.9           ~ 57 0
37 AGAL G030.423+00.466 cor 18 45 12.8 -02 01 12           ~ 31 0
38 IRAS 18431-0312 HII 18 45 45.5 -03 09 21           ~ 20 0
39 WFS 38 smm 18 46 21.8 -02 12 20           ~ 2 0
40 WFS 39 smm 18 46 22.4 -02 14 16           ~ 2 0
41 IRAS 18437-0216 HII 18 46 22.7 -02 13 24           ~ 19 0
42 WFS 41 smm 18 46 33.3 -01 44 52           ~ 2 0
43 IRAS 18440-0148 cor 18 46 36.56 -01 45 21.2           ~ 59 0
44 WFS 51 smm 18 48 37.8 -03 03 48           ~ 2 0
45 AGAL G029.886-00.781 Y*O 18 48 40 -03 03.9           ~ 31 0
46 IRAS 18472-0022 HII 18 49 50.7 -00 19 09           ~ 17 0
47 AGAL G032.471+00.204 cor 18 49 53 -00 19.0           ~ 21 0
48 WFS 57 smm 18 51 24.4 +00 04 39           ~ 2 0
49 IRAS 18488+0000 IR 18 51 24.8 +00 04 19           ~ 31 0
50 AGAL G032.990+00.034 cor 18 51 25.55616 +00 04 07.1292           ~ 22 0
51 WFS 59 smm 18 54 40.6 +01 38 05           ~ 4 0
52 AGAL G034.757+00.024 cor 18 54 40.76 +01 38 05.0           ~ 36 0
53 WFS 60 smm 18 54 44.4 +01 37 00           ~ 2 0
54 IRAS 18530+0215 cor 18 55 33.7 +02 19 09           ~ 39 0
55 IRAS 18540+0220 HII 18 56 35.6 +02 24 54           ~ 15 0
56 WFS 62 smm 18 56 36.6 +02 24 45           ~ 2 0
57 WFS 63 smm 18 56 40.1 +02 25 30           ~ 2 0
58 IRAS 18553+0414 cor 18 57 53.37 +04 18 15.7           ~ 32 0
59 AGAL G039.388-00.141 cor 19 03 45 +05 40.7           ~ 54 1
60 IRAS 19035+0641 Y*O 19 06 01.6288 +06 46 36.140           ~ 78 0
61 WFS 68 smm 19 09 53.4 +07 57 12           ~ 2 0
62 IRAS 19074+0752 cor 19 09 53.55 +07 57 14.8           ~ 43 0
63 WFS 69 smm 19 09 53.9 +07 56 55           ~ 2 0
64 WFS 70 smm 19 19 48.6 +14 02 26           ~ 3 1
65 WFS 71 smm 19 19 48.8 +14 02 46           ~ 3 1
66 IRAS 19175+1357 cor 19 19 49.22 +14 02 46.8           ~ 28 0
67 AGAL G051.678+00.719 cor 19 23 59 +16 57.7           ~ 43 0
68 AGAL G053.037+00.112 cor 19 28 55.5 +17 52 00           ~ 47 0
69 BGPS G053.616+00.036 cor 19 30 23.1 +18 20 22           ~ 12 0
70 IRAS 19282+1814 HII 19 30 28.1 +18 20 53           ~ 37 0
71 AGAL G053.632+00.014 Y*O 19 30 29.542 +18 20 31.74           ~ 9 0
72 NGC 6820 GNe 19 42 27.930 +23 05 14.75       14.56   ~ 49 0
73 WFS 78 smm 19 43 10.6 +23 45 02           ~ 2 0
74 MSX6C G059.7831+00.0648 Y*O 19 43 11.2464 +23 44 03.270           ~ 150 0
75 IRAS 19410+2336 SFR 19 43 11.5 +23 44 06           ~ 156 0
76 IRAS 19411+2306 cor 19 43 17.9613824400 +23 14 01.619818008           ~ 45 0
77 WFS 81 smm 19 43 26.3 +23 40 26           ~ 2 0
78 AGAL G059.762-00.026 cor 19 43 29.29 +23 40 17.5           ~ 16 0
79 MSX6C G059.7654-00.0269 HII 19 43 29.8 +23 40 25           ~ 25 0
80 [BNM96] 063.125+0.443 HII 19 49 09.3798758496 +26 49 08.186732688           ~ 22 0
81 WFS 83 smm 19 49 10.1 +26 49 10           ~ 2 0
82 WFS 84 smm 19 49 11.8 +26 49 38           ~ 2 0
83 IRAS 20051+3435 * 20 07 04.5 +34 44 45           ~ 30 0
84 IRAS 20081+2720 HII 20 10 11.5 +27 29 06           ~ 40 0
85 WFS 86 smm 20 10 12.6 +27 29 13           ~ 2 0
86 WFS 87 smm 20 10 13.3 +27 28 21           ~ 2 0
87 WFS 88 smm 20 10 16.0 +27 28 12           ~ 2 0
88 WFS 89 smm 20 10 18.7 +27 27 18           ~ 2 0
89 IRAS 20126+4104 Y*O 20 14 25.8816769656 +41 13 36.879427236           B2.5-B0.5 441 0
90 WFS 91 smm 20 22 20.0 +39 58 21           ~ 2 0
91 IRAS 20205+3948 Y*O 20 22 21.9 +39 58 05           ~ 28 0
92 WFS 92 smm 20 22 24.9 +39 57 55           ~ 2 0
93 CPM 35 cor 20 23 23.855 +41 17 40.49           ~ 57 0
94 IRAS 20293+3952 HII 20 31 11.040 +40 03 10.69           ~ 75 0
95 IRAS 20319+3958 HII 20 33 49.24632 +40 08 44.1924           ~ 44 1
96 WFS 96 smm 20 34 58.7 +41 34 46           ~ 2 0
97 IRAS 20332+4124 HII 20 35 00.5 +41 34 48           ~ 37 0
98 WFS 97 smm 20 35 01.1 +41 34 59           ~ 2 0
99 WFS 98 smm 20 36 03.4 +41 39 44           ~ 2 0
100 WFS 99 smm 20 36 06.3 +41 39 59           ~ 2 0
101 IRAS 20343+4129 HII 20 36 07.1 +41 40 01           ~ 54 0
102 WFS 100 smm 20 36 08.1 +41 39 58           ~ 2 0
103 IRAS 22134+5834 Y*O 22 15 09.08 +58 49 07.8           ~ 72 0
104 WFS 102 smm 22 57 04.3 +62 37 44           ~ 2 0
105 IRAS 22551+6221 HII 22 57 05.6 +62 37 48           ~ 40 0
106 WFS 103 smm 22 57 07.4 +62 37 29           ~ 2 0
107 WFS 104 smm 22 57 11.6 +62 36 46           ~ 2 0
108 WFS 107 smm 22 59 05.0 +59 28 23           ~ 2 0
109 [BNM96] 109.098-0.346 HII 22 59 05.5344256224 +59 28 23.280817692           ~ 44 0
110 IRAS 23033+5951 Y*O 23 05 25.1762883456 +60 08 15.374293800           ~ 96 0
111 IRAS 23139+5939 Y*O 23 16 10.3420 +59 55 28.596           ~ 97 0
112 IRAS 23151+5912 HII 23 17 21.0 +59 28 49           ~ 100 0
113 WFS 111 smm 23 57 02.1 +65 24 38           ~ 2 0
114 IRAS 23545+6508 * 23 57 05.2 +65 25 11           B 50 0
115 WFS 112 smm 23 57 06.4 +65 24 49           ~ 2 0

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