RNO 1B/1C - A double FU Orionis system
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Abstract
IR imaging and spectroscopic data of the RNO 1 region in the L 1287 molecular cloud are presented. Both RNO lB and RNO IC show the strong 2.3-micron CO absorption bands observed in the pre-main-sequence FU Orionis variables (FUors). These results confirm Staude and Neckel's (1992) identification of RNO 1B as a FUor from optical spectra; its nearby, heavily extincted companion, RNO 1C, also appears to be a FUor. The combined light of RNO 1B/1C has a spectral energy distribution similar to the embedded FUor V1735 Cyg. Over half of the known FUors now appear deeply embedded within dusty molecular gas, which suggests they have ages of roughly 1-3 X 10 exp 5 yr. Our JHK imaging observations exhibit extended near-IR emission along the axis of the molecular outflow from RNO 1B/1C, with morphology similar to the extended I-band emission discovered by Staude and Neckel.
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