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HCN, The First Strong Maser in Carbon-Rich Stars

Published online by Cambridge University Press:  19 July 2016

A. Omont ,
S. Guilloteau  and
R. Lucas
A. Omont
Affiliation:
Observatoire de Grenoble, Université de Grenoble, France
S. Guilloteau
Affiliation:
Observatoire de Grenoble, Université de Grenoble, France
R. Lucas
Affiliation:
Observatoire de Grenoble, Université de Grenoble, France

Abstract

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Maser emission has been observed at the frequency of the (0,2,0) J - 1 - 0 line of HCN (89088 MHz, energy 2050 K above the ground state) in 7 C-rich circumstellar envelopes: CIT 6, S Cep, IRC+ 50096, IRC+30374, FX Ser, AFGL 2513 and IRAS 17581-1744. This is the second molecule showing strong maser emission in millimeter lines, and the first strong maser ever observed in a C-rich circumstellar envelope. The emission is particularly strong (70 Jy) in CIT 6 because of its proximity (Guilloteau, Omont, and Lucas 1987). The masers in the stars have luminosities and linewidths (FWHM about 1 km/s) similar to CIT 6; they are also blueshifted by a few km/s with respect to the velocity of the star given by the central velocity of the ground-state HCN emission (Lucas, Guilloteau, and Omont 1987). These properties are somewhat similar to those of SiO masers in O-rich stars, although the intensities of HCN masers are weaker.

Type
V. Origin of Planetaries
Information
Symposium - International Astronomical Union , Volume 131: Planetary Nebulae , 1989 , pp. 453
Copyright
Copyright © Kluwer 1989 

References

Goldsmith, P.F., Lis, D.C., Guilloteau, S., Lucas, R., Omont, A. 1987, in preparation.Google Scholar
Guilloteau, S., Omont, A., Lucas, R. 1987, Astron. Astrophys., 176, L24.Google Scholar
Lucas, R., Guilloteau, S., Omont, A. 1987, Astron. Astrophys., submitted.Google Scholar