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- W2330284672 abstract "We present a list of post-AGB stars showing molecular line absorption and emission in the optical spectrum. Two objects show CH +, one in emission and one in absorption, and 10 stars show C2 and CN in absorption. The Doppler velocities of the C: lines and the rotational temperatures indicate that the line forming region is the AGB remnant. An analysis of the post-AGB stars of which CO millimeter data is available suggests that the C~ expansion velocity is of the same order as the CO expansion velocity. HD 56126 has been studied in detail and we find a mass-loss rate of ~i=2.8 x 10 -4 M®yr -1, fc2 -- 2.4 x 10 -s and fcN -: 1.3 X 10 -s. The mass-loss derived from C2 is significantly larger than )VI=l.2 x 10 -5 M®yr-lderived from CO. We find that all objects with the 21#m feature in emission show C2 and CN absorption, but not all objects with C2 and CN detections show a 21#m feature." @default.
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- W2330284672 date "1995-01-01" @default.
- W2330284672 modified "2023-10-17" @default.
- W2330284672 title "M OLECULAR L INE A BSORPTION A ND EMISSION IN THE O PTICAL S PECTRA OF POST-AGB S TARS *" @default.
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