Protoplanetary Nebulae

Details Protoplanetary Nebulae Protoplanetary Nebulae

Nov 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000eaa..booke5200k&link_type=abstract

"Encyclopedia of Astronomy and Astrophysics, Edited by Paul Murdin, article 5200. Bristol: Institute of Physics Publishing, 2001

Astronomy and Astrophysics

Astrophysics

Stars, Stellar Models And Concepts

Scientific paper

Protoplanetary nebulae (or pre-planetary nebulae, PPNs) are defined as objects that are in transition between the asymptotic giant branch (AGB) and planetary nebula phases of STELLAR EVOLUTION. Stars on the AGB lose mass at a high rate ((10-7-10-4)M&sun; yr-1) in the form of a stellar wind. Such mass loss eventually depletes the hydrogen envelope of the star and exposes the electron-degenerate carbon...

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