Abstract
We propose that at least two stars on or near the AGB have long-lived orbiting disks: HD 44179, the central star in the Red Rectangle, and BM Gem, a carbon-rich star with an oxygen-rich circumstellar envelope. The CO emission from both of these disks has a spike with a width near ∼2 km s−1, indicating disk radii of ∼1016 cm. The dust in such disks is therefore quite cold (near T ∼ 50 K for the Red Rectangle) and may emit primarily at submillimeter wavelengths. The disks around stars where there is also substantial mass loss may not be easily observable; there could be many as yet undiscovered disks around AGB stars
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Jura, M. Disks Around Post-Main Sequence Binaries. Astrophysics and Space Science 251, 81–88 (1997). https://doi.org/10.1023/A:1000759900660
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DOI: https://doi.org/10.1023/A:1000759900660