F. Malbet et al 1998 ApJ 507 L149 doi:10.1086/311688
FU Orionis Resolved by Infrared Long-Baseline Interferometry at a 2 AU Scale
FREEF. Malbet1, J.-P. Berger1, M. M. Colavita2, C. D. Koresko3, C. Beichman2,4, A. F. Boden2, S. R. Kulkarni3, B. F. Lane3, D. W. Mobley2, X. P. Pan3, M. Shao2, G. T. Van Belle2 and J. K. Wallace2
Show affiliationsWe 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.
- Subject headings
accretion, accretion disks; circumstellar matter; infrared: stars; instrumentation: interferometers; stars: individual (FU Orionis); stars: pre-main sequence
- Dates
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Issue 2 (1998 November 10)
Received 1998 April 22, accepted for publication 1998 August 26
Published 1998 September 24
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FU Orionis Resolved by Infrared Long-Baseline Interferometry at a 2 AU Scale
F. Malbet et al 1998 ApJ 507 L149
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