Interstellar isotope ratios from mm-wave molecular absorption spectra

Details Interstellar isotope ratios from mm-wave molecular absorption spectra Interstellar isotope ratios from mm-wave molecular absorption spectra

Sep 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998a%26a...337..246l&link_type=abstract

Astronomy and Astrophysics, v.337, p.246-252 (1998)

Astronomy and Astrophysics

Astrophysics

50

Ism: Abundances, Ism: Clouds, Ism: Molecules, Ism: Structure, Radio Lines: Interstellar

Scientific paper

We have measured galactic lambda3 mm absorption spectra of {HCO(+) , HCN, HNC, and CS toward compact extragalactic continuum sources in order to derive the isotopic abundance ratios (12) C/(13) C, (14) N/(15) N, (16) O/(18) O, and (32) S/(34) S in local diffuse clouds. For carbon, our data confirm recent results for the local ISM: we find (12) C/(13) C = 59+/-2. For nitrogen, we find 14N/15N = 237(-21,+27) consistent with the Solar value of 270, but substantially smaller than the values inferred from HCN emission in dense clouds. For sulfur we find (32) S/(34) S ~ 19+/-8 consistent with the Solar value of 23. We also find one striking individual anomaly: toward 3C111 (B0415+379), H ^12CN/{H ^13,CN} = 170+/- 50 in one kinematic component. We attribute this to the fractionation of ^13C into ^13CO which may be so great that HCN is starved for ^13C.

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