Astronomy and Astrophysics – Astronomy
Scientific paper
May 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990mnras.244..179k&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 244, May 1, 1990, p. 179-183.
Astronomy and Astrophysics
Astronomy
23
Infrared Sources (Astronomy), Late Stars, Stellar Evolution, Absorption Spectra, Asymptotic Giant Branch Stars, Color-Color Diagram, Emission Spectra, Infrared Astronomy Satellite, Planetary Nebulae
Scientific paper
Late-type stars showing the 9.7-micron feature in emission or absorption are found to occupy different parts of the color-color diagram. Furthermore, these objects are separated in color from planetary nebulae which have high radio surface brightness. The color distribution of these classes of objects suggests the presence of a continuous infrared sequence, connecting the asymptotic giant branch and planetary nebulae phases, which allows for the search for transitional objects between these two evolutionary phases.
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