Transient accretion events in Herbig Ae/Be star spectra: the evidence for infalling planetesimals in HD 100546 (B9e).

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Herbig Ae-Be Stars: Planetesimals, Herbig Ae-Be Stars: Accretion, Planetesimals: Spectroscopy

Scientific paper

Enhanced gaseous absorption has been detected in IUE high dispersion spectra of HD 100546. The presence of atomic gas features in transitions of C I and O I implies that the material is produced by the pyrolysis of an unseen, solid body in a star-grazing orbit. Compared to β Pic, the planetesimals in this system contain substantial amounts of carbonaceous material.

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