Preplanetary nebula | Wikipedia audio article
Channel: wikipedia tts
Date: 29/05/2019

This is an audio version of the Wikipedia Article:
https://en.wikipedia.org/wiki/Protoplanetary_nebula


00:00:39 1 Naming
00:01:33 2 Evolution
00:01:43 2.1 Beginning
00:02:35 2.2 Protoplanetary nebula phase
00:03:59 2.3 End
00:04:46 3 Recent conjectures
00:06:05 4 See also



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SUMMARY
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A protoplanetary nebula or preplanetary nebula (Sahai, Sánchez Contreras & Morris 2005) (PPN) is an astronomical object which is at the short-lived episode during a star's rapid evolution between the late asymptotic giant branch (LAGB) phase and the subsequent planetary nebula (PN) phase.  A PPN emits strongly in infrared radiation, and is a kind of reflection nebula.  It is the second-from-the-last high-luminosity evolution phase in the life cycle of intermediate-mass stars (1–8 M☉). (Kastner 2005)