2010A&A...512A..31S


Query : 2010A&A...512A..31S

2010A&A...512A..31S - Astronomy and Astrophysics, volume 512, A31-31 (2010/3-1)

Abundance anomaly of the 13C species of CCH.

SAKAI N., SARUWATARI O., SAKAI T., TAKANO S. and YAMAMOTO S.

Abstract (from CDS):

We have observed the N=1-0 lines of CCH and its 13C isotopic species toward a cold dark cloud, TMC-1 and a star-forming region, L1527, to investigate the 13C abundances and formation pathways of CCH. The observations have been carried out with the IRAM 30m telescope. We have successfully detected the lines of 13CCH and C13CH toward the both sources and found a significant intensity difference between the two 13C isotopic species. The [C13CH]/[13CCH] abundance ratios are 1.6 ±0.4 (3σ) and 1.6 ±0.1 (3σ) for TMC-1 and L1527, respectively. The abundance difference between C13CH and 13CCH means that the two carbon atoms of CCH are not equivalent in the formation pathway. On the other hand, the [CCH]/[C13CH] and [CCH]/[13CCH] ratios are evaluated to be larger than 170 and 250 toward TMC-1, and to be larger than 80 and 135 toward L1527, respectively. Therefore, both of the 13C species are significantly diluted in comparison with the interstellar 12C/13C ratio of 60. The dilution is discussed in terms of a behavior of 13C in molecular clouds.

Abstract Copyright:

Journal keyword(s): astrochemistry - ISM: molecules - ISM: abundances - ISM: individual objects: TMC-1 - ISM: individual objects: L1527

Simbad objects: 4

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Number of rows : 4
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 NAME [BM89] L1521E DNe 04 29 21.0 +26 14 19           ~ 94 1
2 LDN 1527 DNe 04 39 53 +25 45.0           ~ 543 0
3 TMC-1 MoC 04 41 45.9 +25 41 27           ~ 1463 0
4 NAME Ori A MoC 05 38 -07.1           ~ 2794 0

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2021.10.20-11:44:57

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