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2003ApJ...586..319L - Astrophys. J., 586, 319-337 (2003/March-3)
Shaping proto-planetary and young nebulae with collimated fast winds.
LEE C.-F. and SAHAI R.
Abstract (from CDS):
Various emission diagnostics have been derived from our simulations. For a 300 km/s fast wind, the optical emission arises from both the shocked AGB wind and shocked fast wind, showing one or two bright bowlike structures at the tip of the lobe. However, for a 1000 km/s fast wind, since the shocked fast wind is much hotter, it emits mainly in X-ray emission; the optical emission forms only one bowlike structure at the tip associated with the shocked AGB wind. The position-velocity (PV) diagrams derived from our simulations all show a broad range of velocities at the tip. The detailed PV structure and velocity range at the tip depend on the shell dynamics and the relative contributions of the shocked fast wind and shocked AGB wind.
We make a detailed comparison of our simulations to the observations of the relatively isolated northwestern (W1) lobe of CRL 618. We find that a 300 km/s collimated fast wind with an opening angle of 10° can readily produce a highly collimated lobe similar to the W1 lobe, including the bowlike emission structure at its tip. However, our models have difficulty producing the bright emission structures seen along the body of the lobe. The [S II] λ6716/λ6730 ratios at the tip of the lobe in all of our simulations are similar to that observed at the tip of the W1 lobe. The optical line ratios indicate a temperature stratification in the tip; for both the simulations and observations, however, the temperatures at the tip of the lobe in our simulations are higher than observed. The position-velocity (PV) diagrams derived from our simulations are all qualitatively consistent with the current observations. The collimated fast wind in CRL 618 is unlikely to be steady and is not radiatively driven.
Abstract Copyright: ∼
Journal keyword(s): ISM: Planetary Nebulae: General - Stars: AGB and Post-AGB - Stars: Mass Loss - Stars: Winds, Outflows
Simbad objects: 10
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