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[136.06] Near-IR Excesses and Spectral Energy Distributions for Class II YSO's in Ophiuchus

D.T. Jaffe, J.P. Marsh (UT Austin), A. Tokunaga (Univ of Hawaii)

It has long been known that most CTTs/Class II YSOs have significant non-photospheric excesses in the K band. The precise shape of this excess, however, is not well determined. There is, in addition, a growing body of evidence for non-photospheric continuum emission in the J and H atmospheric windows. We use 0.8-2.4 \mum, R=2000 spectroscopy and IJHK photometry of a small sample of Class II YSOs in Ophiuchus to investigate the shape of the non-photospheric K emission and the existence and nature of the short wavelength continuum excess. By using a sample of stars with well-determined effective temperatures and by taking advantage of detailed stellar models, we can use both the continuum shape and the line equivalent widths to derive spectra of the excesses. The derived information can be used to constrain models of the structure of the inner disks in YSOs.

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Bulletin of the American Astronomical Society, 36 5
© 2004. The American Astronomical Society.