The Onset of Photoionization in Post-AGB Stars

Details The Onset of Photoionization in Post-AGB Stars The Onset of Photoionization in Post-AGB Stars

Feb 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002rmxac..12..157m&link_type=abstract

Ionized Gaseous Nebulae, a Conference to Celebrate the 60th Birthdays of Silvia Torres-Peimbert and Manuel Peimbert, Mexico City

Astronomy and Astrophysics

Astronomy

Circumstellar Matter, Line: Profiles, Binaries: Symbiotic, Planetary Nebulae: General, Stars: Agb And Post-Agb

Scientific paper

During the post-AGB phase the dust shell detaches from the central star and dust temperatures varies between 100 and 200 K. In order to study the onset of photo-ionization in post-AGB stars, IRSPEC near-infrared spectroscopy of 40 IRAS sources from the Point Source Catalogue was conducted. In 27 of the post-AGB observed Br gamma is detected. In addition, molecular emission lines of H[2] 1-0 S(1) and 2-1 S(1) were detected in 11 objects. The observations show that all the sources but one, with molecular emission, exhibit photo-ionization. A detailed description and discussion of the results are presented.

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