2003A&A...399..567B


Query : 2003A&A...399..567B

2003A&A...399..567B - Astronomy and Astrophysics, volume 399, 567-581 (2003/2-4)

Sulphur-bearing species as chemical clocks for low mass protostars?

BUCKLE J.V. and FULLER G.A.

Abstract (from CDS):

We present observations of H2S, SO and SO2 towards a sample of Class 0 and Class I sources. The H2S abundances rule out its formation in the gas phase and we assume that it is released from grain mantles. Applying a model of the evolution of the sulphur chemistry first used in the study of hot cores, we show that this model can reproduce the results of our observations even for the relatively low temperatures and densities of these sources. We demonstrate that the chemical evolution of sulphur bearing species is a potentially valuable probe of chemical timescales in low mass star forming regions. Overall, the model indicates that Class I sources are at a later chemical evolutionary stage than their Class 0 counterparts, with an average difference in chemical age of at least 3x103 years and an upper limit on the age of the Class I sources of a few times 105 years.

Abstract Copyright:

Journal keyword(s): stars: formation - radio lines: ISM - ISM: abundances - astrochemistry

CDS comments: Table 2 : SMM NN objects are [CED93] NN in SIMBAD.

Simbad objects: 20

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Number of rows : 20
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 IRAS 03282+3035 cor 03 31 20.98 +30 45 30.1           ~ 167 0
2 IRAS 04166+2706 Y*O 04 19 42.62736 +27 13 38.4312           ~ 127 0
3 IRAS 04169+2702 Y*O 04 19 58.44936 +27 09 57.0672           K0-M4 111 1
4 IRAS 04191+1523 Y*O 04 22 00.43944 +15 30 21.2148           ~ 195 0
5 RAFGL 5123 Y*O 04 31 34.07736 +18 08 04.9020           K3V/M3III 842 0
6 2MASS J04314444+1808315 Y*O 04 31 44.44680 +18 08 31.5384           ~ 163 0
7 IRAS 04325+2402 Y*O 04 35 35.39160 +24 08 19.4244           ~ 156 0
8 IRAS 04361+2547 Y*O 04 39 13.89288 +25 53 20.8788           ~ 191 1
9 LDN 1527 DNe 04 39 53 +25 45.0           ~ 581 0
10 IRAS 04381+2540 Y*O 04 41 12.67920 +25 46 35.4216           K0-M2 127 1
11 SH 2-68 N Y*O 18 29 48.09 +01 16 45.0           ~ 128 1
12 NAME Serpens Cloud SFR 18 29 49 +01 14.8           ~ 1038 2
13 NAME SH 2-68 FIR 1 cor 18 29 49.63 +01 15 21.9           ~ 261 2
14 NAME Serpens SMM 4 cor 18 29 57.1 +01 13 15           ~ 134 0
15 NAME Serpens SMM 11 smm 18 30 00.3 +01 11 42           ~ 24 0
16 [CED93] 8 smm 18 30 01.8 +01 15 07           ~ 18 0
17 LDN 663 DNe 19 36 55 +07 34.4           ~ 608 0
18 LDN 1152 DNe 20 35 50.2 +67 54 22           ~ 73 0
19 LDN 1157 DNe 20 39 06.4 +68 02 13           ~ 549 0
20 LDN 1262 MoC 23 25 47 +74 17.6           ~ 132 0

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2022.12.02-05:41:49

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