The H13CN/HC15N Abundance Ratio in Dense Cores: Possible Source-to-Source Variation of Isotope Abundances?

Details The H13CN/HC15N Abundance Ratio in Dense Cores: Possible Source-to-Source Variation of Isotope Abundances? The H13CN/HC15N Abundance Ratio in Dense Cores: Possible Source-to-Source Variation of Isotope Abundances?

Aug 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002apj...575..250i&link_type=abstract

The Astrophysical Journal, Volume 575, Issue 1, pp. 250-256.

Astronomy and Astrophysics

Astronomy

14

Ism: Clouds, Ism: Individual: Alphanumeric: L1498, Ism: Individual (L1521E, Tmc-1), Ism: Molecules, Radio Lines: Ism

Scientific paper

We have observed the H13CN (J=1-0) and HC15N (J=1-0) lines simultaneously toward three dense cores in the Taurus molecular cloud complex and have found a significant source-to-source variation of the column density ratio, N(H13CN)/N(HC15N). The lowest ratio of 2.6-3.1 is observed toward L1521E, while the highest ratio of 8-11 is observed toward L1498. We have also observed the 12C18O (J=1-0, 2-1) and 13C18O (J=1-0) lines, and the 12C/13C ratio has been derived to be 58.8+/-3.7 and >=117 toward L1521E and L1498, respectively. These results imply that a substantial isotope fractionation effect may exist in the formation processes of these molecules, or elemental abundances are not uniform among the observed sources. If the source-to-source variation of the (14N/15N)/(12C/13C) ratio in HCN and the 12C/13C ratio in CO originates from the elemental abundance variation, the 14N/15N ratio is calculated to be 151+/-16 and >=813 for L1521E and L1498, respectively. These ratios significantly deviate from the values obtained toward Galactic disk sources.

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