FU Orionis Resolved by Infrared Long-Baseline Interferometry at a 2 AU Scale
Open Access
- 10 November 1998
- journal article
- research article
- Published by American Astronomical Society in The Astrophysical Journal
- Vol. 507 (2) , L149-L152
- https://doi.org/10.1086/311688
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 (PTI). FU Orionis exhibits a visibility of V2=0.72 ± 0.07 for a 103 ± 5 m-projected baseline at λ=2.2 μm. On the spatial scale probed by the PTI, the data are consistent with both a binary system scenario (a maximum magnitude difference of 2.7 ± 0.5 mag and the smallest separation of 0.35 ± 0.05 AU) and a standard luminous accretion disk model ( ~6 × 10−5 M☉ yr-1), where the thermal emission dominates the stellar scattering, and are inconsistent with a single stellar photosphere.Keywords
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