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1995•UvA-DARE (University of Amsterdam)Open access

NEAR-INFRARED SPECTROSCOPY OF POST-AGB STARS

R. D. Oudmaijer, Lbfm Waters, Wecj Vanderveen, Tr Geballe

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Abstract

The results of a medium resolution near-infrared spectral survey of 18 post-AGB candidate stars are presented. Most of the stars have near-infrared hydrogen lines in absorption, which is normal for their spectral types. Three stars, HD 101584, HD 179821 and HD 170756 have the CO first overtone bands in emission; in two of these the emission is variable. It is suggested that the CO emission is the result of post-AGB mass loss. HD 52961 shows the rarely occurring 3.5 mu m emission feature and is only the fourth object in which this feature has been detected.

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What this paper is about

The results of a medium resolution near-infrared spectral survey of 18 post-AGB candidate stars are presented. Most of the stars have near-infrared hydrogen lines in absorption, which is normal for their spectral types. Three stars, HD 101584, HD 179821 and HD 170756 have the CO first overtone bands in emission; in two of these the emission is variable. It is suggested that the CO emission is the result of post-AGB mass loss. HD 52961 shows the rarely occurring 3.5 mu m emission feature and is only the fourth object in which this feature has been detected.

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Available abstract

The results of a medium resolution near-infrared spectral survey of 18 post-AGB candidate stars are presented. Most of the stars have near-infrared hydrogen lines in absorption, which is normal for their spectral types. Three stars, HD 101584, HD 179821 and HD 170756 have the CO first overtone bands in emission; in two of these the emission is variable. It is suggested that the CO emission is the result of post-AGB mass loss. HD 52961 shows the rarely occurring 3.5 mu m emission feature and is only the fourth object in which this feature has been detected.

Key concepts: Physics, Astrophysics, Overtone, Stars, Infrared, Spectroscopy, Astronomy, Emission spectrum

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