Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996a%26a...306..241g&link_type=abstract
Astronomy and Astrophysics, v.306, p.241
Astronomy and Astrophysics
Astrophysics
21
Circumstellar Matter, Stars: Mass Loss, Stars: Agb, Carbon, Radio Lines: Stars
Scientific paper
We present CO and HCN observations of carbon stars. They consist of partly new detections in the ^12^CO J=(1-0),(2-1) and HCN(1-0) lines obtained with the SEST and the IRAM telescope, and of ^12^CO and ^13^CO J=(1-0),(2-1) and (3-2) observations with IRAM and the JCMT of some of the infrared brightest carbon stars. Recently, Bujarrabal et al. (1994a,b) proposed a critical value for the ratio of the integrated intensities HCN(1-0)/^12^CO(1-0) to distinguish between carbon stars and oxygen-rich stars. In four carbon stars we find ratios consistent with their borderline value, and in two cases HCN/CO ratios below their suggested borderline value in stars which are almost certainly carbon stars. The apparent discrepancy may lie in the fact that the critical line ratio in Bujarrabal et al. is derived for the 30m IRAM telescope, while our ratios are derived from 15m SEST data. The difference in beam size may result in slightly different excitation regions being sampled.
Baas F.
de Jong Teije
Groenewegen Martin A. T.
Loup Caroline
No associations
LandOfFree
CO and HCN observations of carbon stars. does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with CO and HCN observations of carbon stars., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and CO and HCN observations of carbon stars. will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1153098