VizieR Online Data Catalog: CN in circumstellar envelopes survey (Bachiller+ 1997)
Abstract
We list in Table 1 the observed stars together with some of their characteristics. Distances, expansion velocities, mass loss rates, and spectral types are taken from the compilations of Bujarrabal et al. (1994) <J/A+A/285/247> and Loup et al. (1993A&AS...99..291). The sample includes C-rich and O-rich objects, some S-stars, a few proto-PN, and a young PN (NGC7027). See paper for more details. In Table 2, we give some of the observational parameters. Alow and Ahigh refer to the integrated intensity of the low-frequency and high-frequency fine-structure groups. The intrinsic intensity ratios, R=Ahigh/Alow, are R(1-0)=2 and R(2-1)=1.8. In principle, the observation of several components with different intrinsic strengths allows an estimate of the line optical depth, and the value of R gives an estimate of the envelope thickness. (2 data files).
- Publication:
-
VizieR Online Data Catalog
- Pub Date:
- August 1996
- DOI:
- 10.26093/cds/vizier.33190235
- Bibcode:
- 1996yCat..33190235B
- Keywords:
-
- Stars: giant;
- Abundances