A Sub-millimeter-wave ``Flare'' from GG Tau?

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Session 91 -- Young Stars and Young Clusters
Oral presentation, Wednesday, 11, 1995, 10:00am - 11:30am

[91.01] A Sub-millimeter-wave ``Flare'' from GG Tau?

Gerald H. Moriarty-Schieven (Dominion Radio Astrophysical Observatory, National Research Council of Canada), Harold M. Butner (Department of Terrestrial Magnetism, Carnegie Institution of Washington)

GG Tau is a young stellar object consisting of a pair of close binaries (Leinert et al 1991), one of which is a ``classical'' T Tauri star (Herbig \& Bell 1988). Surrounding the main binary is a massive, rotating, circumbinary disk (Simon \& Guilloteau 1992; Kawabe et al 1993; Koerner et al 1993; Dutrey et al 1994) with possibly a central ``hole'' or cavity (Dutrey et al 1994). We have been monitoring the mm/sub-mm continuum flux from this disk at 800, 1100 and 1300 ${\mu}m$, and have found that between September 1991 and January 1994 the flux density has increased by $>$50\% at 800${\mu}m$, and much less at 1300${\mu}m$. The lack of significant flux changes at long wavelengths suggests that this outburst or ``flare'' results from a change in inner disk temperature with a steepening of the dust temperature gradient. One possible cause for a sudden temperature increase might be a massive accretion event in the inner circumstellar (as opposed to circumbinary) disk, like those believed to cause FU Orionis outbursts.

\begin{center} {References} \end{center}

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\noindent Herbig, G., \& Bell, K. R. 1988, Lick Observatory Bull. No. 1111

\noindent Leinert, C., Haas, M., Mundt, R., Richichi, A., \& Zinnecker, H. 1991, A{\&}A, 250, 407

\noindent Kawabe, R., Ishiguro, M., Omodaka, T., Kitamura, Y., \& Miyama, S. M. 1993, ApJ, 404, L63

\noindent Koerner, D. W., Sargent, A. I., \& Beckwith, S. V. W. 1993, Apjlett, 408, L93

\noindent Simon, M., \& Guilloteau, S. 1992, ApJ, 397, L47

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