Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...379..168b&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 379, Sept. 20, 1991, p. 168-176. Research supported by University of Maryla
Astronomy and Astrophysics
Astronomy
33
Abundance, Cosmic Dust, Globular Clusters, Interstellar Matter, Planetary Nebulae, Radiant Heating, Stellar Radiation, Astronomical Models, Halos, Infrared Astronomy Satellite, Infrared Radiation, Photoelectric Emission, Stellar Winds
Scientific paper
Detailed modeling of a halo planetary nebula located in the metal-poor globular cluster M22 has been carried out. Models of the far-infrared continuum emission observed by the IRAS satellite indicate that the total dust mass is about 0.001 solar mass, a large amount of dust when compared to the upper limit of 0.004 solar mass to the total H and He mass. Photoelectric emission from dust grains heats the nebular gas to temperatures about 10,000 K and accounts for the observed O III and Ne III forbidden emission lines. The present grain-heated nebular models predict a large, negative temperature gradient across the nebula. Advanced nuclear processing in the He-burning states of stellar evolution is implied by the presence of dust grains, most probably composed of C, and the observed O and Ne overabundance.
Borkowski Kazimierz J.
Harrington Patrick J.
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