He 3-1475 and Its Jets
Grebel, E. K.; Zijlstra, A. A.; Tinney, C. G.; Bedding, T. R.; Bobrowsky, M.; Likkel, L.; van de Steene, G. C.; te Lintel Hekkert, P.
Abstract
We present spectra and high-resolution images taken with the Hubble Space Telescope (HST), the NTT, the VLA, and the MPIA/ESO 2.2 m telescope of the emission-line star He 3-1475, which we suggest is a postasymptotic giant branch star. The star is presumed to be at the origin of a 15" long structure containing symmetrically opposing bright knots. The knots have radial velocities of ±500 km s-1 from the center of He 3-1475 to the ends of the jets. HST snapshots show that the core of He 3-1475 is unipolar with a star at the SE end and the nebula fanning out toward the NW. VLA observations show the presence of OH masers, which are positioned parallel to the optical jets. A model is proposed that accounts for all of the observational data. This unusual object may link the OH/IR stars having extreme outflow velocities with highly bipolar planetary nebulae.