FU Orionis Resolved by Infrared Long-Baseline Interferometry at a 2 AU Scale
The Astrophysical Journal1998Vol. 507(2), pp. L149–L152
Citations Over TimeTop 12% of 1998 papers
F. Malbet, Jean-Philippe Berger, M. M. Colavita, C. Koresko, Charles Beichman, Andrew F. Boden, S. R. Kulkarni, Benjamin F. Lane, D. W. Mobley, Xiaopei Pan, M. Shao, Gerald van Belle, J. Kent Wallace
Abstract
We present the first infrared interferometric observations of a young stellar object with a spatial projected resolution better than 2 AU. The observations were obtained with the Palomar Testbed Interferometer. FU Ori exhibits a visibility of V^2 =0.72 +/- 0.07 for a 103 +/- 5 m projected baseline at lambda = 2.2 microns. The data are consistent on the spatial scale probed by PTI both with a binary system scenario (maximum magnitude difference of 2.7 +/- 0.5 mag and smallest separation of 0.35 +/- 0.05 AU) and a standard luminous accretion disk model (approx. accretion rate of 6e-5 Mo/yr) where the thermal emission dominates the stellar scattering, and inconsistent with a single stellar photosphere.
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