Discovery of Two New HCN Maser Lines in Five Carbon Stars

Details Discovery of Two New HCN Maser Lines in Five Carbon Stars Discovery of Two New HCN Maser Lines in Five Carbon Stars

Mar 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001apj...549l.125b&link_type=abstract

The Astrophysical Journal, Volume 549, Issue 1, pp. L125-L129.

Astronomy and Astrophysics

Astronomy

6

Masers, Molecular Processes, Radio Lines: Stars, Stars: Carbon, Stars: Mass Loss

Scientific paper

A survey with the Heinrich Hertz Submillimeter Telescope of HCN emission from mass-losing carbon stars has revealed masers in the J=3-2 and 4-3 transitions of the (011c0) vibrational bending mode. These lines have not previously been known to show maser action. Five stars-R Scl, V384 Per, R Lep, Y CVn, and V Cyg-out of 12 observed were detected as masers. Allowing for evidence of variability, this detection rate suggests that these HCN lines are masers at least some of the time in the majority of mass-losing carbon stars. The line widths and velocities imply that the maser action occurs in gas close to the star, where the circumstellar envelope is just being accelerated outward.

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