Objects in transition from the AGB to the planetary nebula stage - New visual and infrared observations

Details Objects in transition from the AGB to the planetary nebula stage - New visual and infrared observations Objects in transition from the AGB to the planetary nebula stage - New visual and infrared observations

Dec 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989a%26a...226..108v&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 226, no. 1, Dec. 1989, p. 108-136. Research supported by NWO and ASTRON.

Astronomy and Astrophysics

Astronomy

175

Asymptotic Giant Branch Stars, Infrared Astronomy, Planetary Nebulae, Stellar Evolution, Stellar Mass Ejection, Visual Observation, Astronomical Photometry, Astronomical Spectroscopy, Infrared Astronomy Satellite, Statistical Analysis

Scientific paper

Results are presented of visual and IR observations of 42 IRAS point sources that are candidates for objects in transition from the AGB to the planetary nebula stage. Evidence is presented that most of these sources are very different from mass-losing AGB stars. One of the candidate transition objects was found to be a possible young planetary nebula on the basis of its hydrogen recombination lines observed in the NIR. Based on the shapes of their spectra, the sources were found to fall into five classes (which do not form an evolutionary sequence from the AGB to the planetary nebula), each containing at least 10 percent of the whole sample. The differences between the classes are caused by their history and by the present-day mass loss rate.

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