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P. J. Huggins (NYU), C. Muthu, R. Bachiller (OAN, Madrid), T. Forveille (CFHT), P. Cox (IAS, Paris)
We report high resolution (1"-2") imaging of the CO 2-1 line and the millimeter continuum in the remarkable proto-planetary nebula He 3-1475. The observations, made with the IRAM Plateau de Bure interferometer, reveal the presence of a massive (~0.6 solar mass) envelope of molecular gas around the origin of the bipolar jet system seen in optical images with the HST. The CO kinematics are well modeled by an expanding, bi-conical envelope: the prominent, high-velocity (~50 km s-1) wings seen in single-dish CO spectra arise where the sides of the bi-cones are projected along the line of sight. The continuum is detected at 1.3 mm and 2.6 mm and is due to thermal emission from warm (~80 K) circumstellar dust. The structure, kinematics, and expansion time of the envelope provide strong evidence for entrainment of the molecular gas by the high velocity jets. The observations support an evolutionary scenario in which a period of enhanced mass loss by the central star is followed by the development of the bipolar jets which burst through the molecular envelope. The jet-envelope interactions play a crucial role in shaping the subsequent ionized nebula. This work was supported in part by NSF AST 03-07277.
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Bulletin of the American Astronomical Society, 35#5
© 2003. The American Astronomical Soceity.