Astronomy and Astrophysics – Astrophysics
Scientific paper
1996-09-04
Astronomy and Astrophysics
Astrophysics
7 pages, 3 figures, to appear in IAU 177 "The carbon star phenomenon"
Scientific paper
Recent optical spectra of post-AGB stars show the presence of C2, CN, and CH+ originating in the circumstellar shell. We present here new, higher resolution spectra which provide constraints on the physical parameters and information on the line profiles. An empirical curve of growth for the C2 Phillips and CN Red system lines in the spectrum of HD 56126 yields b = 0.50 (+0.59, -0.23) km/s. CH+ (0,0) emission lines in the spectrum of the Red Rectangle have been resolved with a FWHM approx 8.5 pm 0.8 km/s. The circumstellar CN lines of IRAS 08005--2356 are resolved into two separate components with a velocity separation of Delta v = 5.7 pm 2.0 km/s. The line profiles of CN of HD 235858 have not been resolved.
Bakker Eric J.
Lambert David L.
van Dishoeck Ewine F.
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