An infrared sequence in the late stages of stellar evolution

Astronomy and Astrophysics – Astronomy

Scientific paper

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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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