Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993basi...21..363s&link_type=abstract
Astronomical Society of India, Bulletin (ISSN 0304-9523), vol. 21, no. 3-4, p. 363
Astronomy and Astrophysics
Astronomy
Asymptotic Giant Branch Stars, Interstellar Gas, Molecular Spectroscopy, Planetary Nebulae, Abundance, Line Spectra, Photoionization, Spectrum Analysis
Scientific paper
M4-18 has been known to be a low excitation nebula of type WC11 (van der Hucht et al. 1981; Goodrich & Dahari 1985). All the nebulae of this WC11 group show spectra dominated by numerous stellar C II and C III lines along with low excitation nebular lines. A large IR excess is typical of these objects. The interpretation of their spectra is complicated due to the fact that cool gas is mixed with dust grains and some of the nebular diagnostic lines are blended with stellar lines. Their evolutionary status is not very clear. They may either be proto-planetary nebulae or they may be objects going through the nebular phase for a second time, i.e. 'born-again asymptotic giant branch (AGB) stars'. They may be also linked to the RCrB stars. The thesis addresses such main issues by way of combining theory and observation.
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