AAS 207th Meeting, 8-12 January 2006
Session 74 Planets in Binary Star Systems, Young Stars and Jets
Poster, Tuesday, 9:20am-6:30pm, January 10, 2006, Exhibit Hall

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[74.24] A Study of the Nature of Herbig Ae/Be Companion Stars

B.L. Brandvig (CTIO REU), B. Rodgers (Gemini Observatory), N. van der Bliek, S. Thomas (CTIO), G. Doppmann (Gemini Observatory), J. Bouvier (Observatoire de Grenoble)

Spectral energy distributions (SEDs) for eight Herbig Ae/Be multiple systems have been constructed with the intent of determining the spectral type of the companion and observing any near-infrared excess in the spectrum. Five of the eight systems (BF Ori, HR 5999, V586 Ori, MWC 147, MWC 863) exhibit the expected features, a late-type companion with near-infrared excess, which necessarily makes it difficult to determine a spectral type based on the SED alone. The remaining three systems lack either some or all of these features. Near-infrared spectra has been analyzed for one of the three anomalous systems, Hen 3-225, which confirms that it is an early B star. This leads to two possibilities: the companion of Hen 3-225 is an unassociated background star or it suffers from roughly 1.5 magnitudes of grey extinction without significant reddening or near infrared excess. Thanks to the CTIO REU program for this research opportunity.

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Bulletin of the American Astronomical Society, 37 #4
© 2005. The American Astronomical Soceity.