A Search for Companions to AGB Stars

Astronomy and Astrophysics – Astronomy

Scientific paper

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Scientific paper

Most current theories to explain the observed shapes of planetary nebulae require that the nebula be created by a binary star system rather than an isolated asymptotic giant branch (AGB) star. Detection of binary companions to AGB stars, however, is hampered by the extreme luminosity of the primaries. We have used observations taken in ultraviolet light, where the AGB star is relatively faint, to search for systems that have flux in excess of AGB star models. Of the systems for which we obtained data, nearly all have an ultraviolet excess, which we interpret as emission from a companion star. The high detection rate demonstrates the feasibility of ultraviolet observations as a search technique for hot companions of AGB stars.

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