protoplanetary nebula

protoplanetary nebula
A stage in stellar evolution when a star starts to shed its outer layers before coming a true planetary nebula.

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  • Protoplanetary nebula — A protoplanetary nebula or preplanetary nebula Harv|Sahai|Sánchez Contreras|Morris|2005 (PPN) is an astronomical object which is at the short lived episode during a star s rapid stellar evolution between the late asymptotic giant branch (LAGB)Ref …   Wikipedia

  • Protoplanetary disk — A protoplanetary disk (or proplyd) is a rotating circumstellar disk of dense gas surrounding a young newly formed star, a T Tauri star or Herbig star. The protoplanetary disk may be considered an accretion disk because gaseous material may be… …   Wikipedia

  • Nebula — Nebulae redirects here. For the supercomputer in China, see Nebulae (computer). For other uses, see Nebula (disambiguation). The Pillars of Creation from the Eagle Nebula …   Wikipedia

  • Nebula class starship — Nebula class The USS Sutherland (NCC 72015) in 2368. First appearance The Wounded Affiliation United Federation of Planets Starfleet …   Wikipedia

  • Frosty Leo Nebula — Protoplanetary nebula caption= 2003 Hubble Advanced Camera for Surveys HRC name = Frosty Leo Nebula epoch = J2000 ra = RA|09|39|53.96Harv|SIMBAD|2007] dec = DEC|+11|58|52.4 dist ly = 3.0 kly (920 pc)Harv|Davis|Smith|Gledhill|Varricatt|2005]… …   Wikipedia

  • Boomerang Nebula — Protoplanetary nebula caption=The Boomerang Nebula. Credit: NASA/ESA name = Boomerang Nebula epoch = J2000 ra = RA|12|44|45.45Harvard reference | Surname1 = SIMBAD | Title = Results for Boomerang Nebula | Authorlink = SIMBAD | Journal = | Year =… …   Wikipedia

  • Calabash Nebula — Protoplanetary nebula caption= Calabash Nebula name = Calabash Nebula epoch = J2000 ra = RA|07|42|16.83Harv|SIMBAD|2007] dec = DEC| 14|42|52.1 dist ly = 4.2 kly (1.3 kpc)Harv|Kastner|Weintraub|Merrill|Gatley|1998] appmag v = 9.47 size v = 1… …   Wikipedia

  • Red Rectangle Nebula — Protoplanetary nebula caption = name = Red Rectangle Nebula epoch = J2000 ra = RA|06|19|58.2160Harv|SIMBAD|2007] dec = DEC| 10|38|14.691 dist ly = 2.3 ± 0.3 kly (710 ± 100 pc)Harv|Men shchikov|Schertl|Tuthill|Weigelt|2002] appmag v = 9.02 size v …   Wikipedia

  • Egg Nebula — Protoplanetary nebula caption=RAFGL 2688, the Egg Nebula name = Egg Nebula type = epoch = J2000 ra = RA|21|02|18.75cite web title=SIMBAD Astronomical Database work=Results for Egg Nebula url=http://simbad.u strasbg.fr/Simbad accessdate=2007 01… …   Wikipedia

  • Cotton Candy Nebula — The Cotton Candy Nebula as seen by Hubble. Credits: Sun Kwok and Kate Su (University of Calgary), Bruce Hrivnak (Valparaiso University), and NASA The Cotton Candy Nebula is a protoplanetary nebula that was originally discovered by the IRAS… …   Wikipedia

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