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1998ApJ...509..728W - Astrophys. J., 509, 728-732 (1998/December-3)
The onset of molecular hydrogen emission from proto-planetary nebulae.
WEINTRAUB D.A., HUARD T., KASTNER J.H. and GATLEY I.
Abstract (from CDS):
All of the H2-emitting pre-planetary nebulae are found at low galactic latitudes, consistent with previous results for planetary nebulae, and have central stars with intermediate or early spectral types. We were unable to detect H2 emission from the bipolar, post-main-sequence sources OH 231.8+4.2, IRAS 07131-0147, and IRAS 09371+1212, all of which have M-type central stars. These results suggest that the event that triggers the production of emission from shocked H2 occurs at an intermediate evolutionary epoch in the postasymptotic giant branch evolution of transition objects, after the generation of bipolar structure and before the nebular envelopes are ionized. From constraints imposed by the galactic distribution of H2-emitting planetaries, we estimate distances to the four pre-planetary nebulae that display H2 emission.
Abstract Copyright: ∼
Journal keyword(s): Stars: Circumstellar Matter - Infrared: ISM: Lines and Bands - ISM: Molecules - ISM: Planetary Nebulae: General - Stars: AGB and Post-AGB
Simbad objects: 10
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