Abstract
The observed HNC/HCN (J=1-0) intensity ratios are consistent with the result that the HNC to HCN abundance ratio is order of 1 in cold dark clouds.
The HNC and NH3 observations towards L1551 suggest a correlation between the abundances of those molecules.
The observed HCN (J=1-0) hyperfine ratios show relatively large variations of R02 in certain ranges of R12. It is difficult to explain this by population variations of the J=1 F=0 state. Scattering in the foreground gas seems more likely.
The observed R12 ratios towards the core of L810 imply that the population of the J=1 F=1 state is dimished relative to that of the F=2 state. This may be a case where the thermal overlap model presented by Guilloteau and Baudry (1981) is applicable.
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References
Cernicharo, J., Castets, A., Duvert, G., Guilloteau, S.: 1984, Astron. Astrophys. 139, L13–L15
Churchwell, E., Nash, A.G., Walmsley, C.M.: 1984, Astrophys. J. 287, 681–693
Conrad, M.P., Schaefer, H.F. III: 1978, Nature 274, 456–467
Irvine, W.I., Schloerb, F.P.: 1984, Astrophys. J. 282, 516–521
Menten, K.M., Walmsley, C.M.: 1985, Astron. Astrophys. 146, 369–374
Guilloteau, S., Baudry, A.: 1981, Astron. Astrophys. 97, 213–217
Wootten, A., Evans, N.J. III, Snell, R., Vanden Bout, P.: 1978, Astrophys. J. 225, L143–L148
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© 1988 Springer-Verlag
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Harju, J. (1988). HCN and HNC observations towards dark clouds. In: Dickman, R.L., Snell, R.L., Young, J.S. (eds) Molecular Clouds in the Milky Way and External Galaxies. Lecture Notes in Physics, vol 315. Springer, Berlin, Heidelberg. https://doi.org/10.1007/3-540-50438-9_258
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DOI: https://doi.org/10.1007/3-540-50438-9_258
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