Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988a%26a...194..230l&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 194, no. 1-2, April 1988, p. 230-236.
Astronomy and Astrophysics
Astrophysics
35
Gas Masers, Hydrocyanic Acid, Line Spectra, Spectral Line Width, Stellar Envelopes, Millimeter Waves, Radio Telescopes
Scientific paper
Eighty-five C-rich circumstellar envelopes have been searched for vibrationally excited HCN masers similar to the one in CIT 6 (Guilloteau et al., 1987). Six new masers were found. Luminosities, linewidths and blueshifts with respect to the central velocity of the ground-state HCN emission are similar to those of the CIT 6 maser. Strong maser emission seems confined to envelopes with intermediate mass loss rates between 10 to the -6th and 10 to the -5th solar mass/yr which have very similar infrared properties. It is present in about 20 percent of them. Time variations occur on month scales, since one maser had disappeared 80 days after its detection. No emission was detected in CIT 6 from the J = 3 - 2 transitions of different vibrationally excited states of HCN.
Guilloteau Stéphane
Lucas Robert
Omont Alain
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