How Fast are Collimated Outflows in Planetary Nebulae?

Details How Fast are Collimated Outflows in Planetary Nebulae? How Fast are Collimated Outflows in Planetary Nebulae?

Feb 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002rmxac..12..156g&link_type=abstract

Ionized Gaseous Nebulae, a Conference to Celebrate the 60th Birthdays of Silvia Torres-Peimbert and Manuel Peimbert, Mexico City

Astronomy and Astrophysics

Astronomy

2

Circumstellar Matter, Line: Profiles, Binaries: Symbiotic, Planetary Nebulae: General, Stars: Agb And Post-Agb

Scientific paper

A significant fraction of planetary nebulae (PNe) show jet-like features. These features are usually interpreted as fast collimated outflows, although their true space velocities are uncertain, as their measured radial velocities cannot be properly corrected for projection effects. We have compiled the measured expansion velocities and radial distances of collimated outflows for a sample of 33 PNe and analyzed statistically their distributions. Our analysis indicates that the true space velocities of collimated outflows have a bi-modal distribution. Most of them are consistent with true expansion velocities <= 70 km s-1; only a small fraction of them expand faster.

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