Properties of Galactic FS CMa Type Objects, a New Group of Dust-Forming Systems

Astronomy and Astrophysics – Astronomy

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Circumstellar Matter, Stars: Early-Type, Stars: Emission-Line, Be

Scientific paper

The recently defined Galactic FS CMa group comprises ˜ 40 not very luminous objects that significantly expand the luminosity range of hot dust-forming stars. These objects exhibit extremely strong emission-line spectra and IR excesses, which are indicative of compact dust envelopes. They are most likely binary systems that currently undergo or have recently undergone a phase of a rapid mass exchange, associated with dust formation. Complex structure of the circumstellar environments significantly veils the underlying stars and requires multitechnique investigation, in which interferometry should play an important role.

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