New HC7N cloudlets in Taurus.
Abstract
The authors report the detection of the J = 17-16 line of HC7N towards six cloudlets of the Taurus dark clouds complex. The HC7N column densities towards these globules range between 0.8x1012 and 4x1012cm-2, i.e., 4 - 20 times lower than towards TMC1. However, the average column density ratio N(HC5N)/N(HC7N) is 3.6, i.e., similar to the TMC1 one. Little variations of this abundance ratio are found from cloud to cloud whatever the total cyanopolyyne column density is. One of these cloudlets, L1495, is a new cyanopolyyne source and physical conditions towards it are derived from NH3, HC3N, and HC5N observations.
- Publication:
-
Astronomy and Astrophysics
- Pub Date:
- May 1986
- Bibcode:
- 1986A&A...160..181C
- Keywords:
-
- Abundance;
- Cyano Compounds;
- Molecular Clouds;
- Taurus Constellation;
- Cyanoacetylene;
- Interstellar Chemistry;
- Astrophysics