Emission-line Stars with Infrared Dust Emission: Implications of the Galactic Distribution

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Abstract
Near-infrared photometry of a final selection of emission-line stars is presented. A sample of about 700 such stars is analyzed and it is shown that those with circumstellar dust have a spiral arm distribution in the galaxy. The peculiar Be stars with dust are also considered in isolation; these too are found to have a Population I distribution. It is therefore unlikely that they are symbiotic stars or the progenitors of normal planetary nebulae; they probably form a distinct type whose nearest relatives are the VV Cephei stars.

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