2002/03/08 by Silvia Torres-Peimbert, Torres-Peimbert, Silvia, Manuel Peimbert +1
Physics and Astronomy · #Astrophysics (astro-ph) #FOS: Physical sciences #astro-ph
paper · pdf · doi:10.48550/arxiv.astro-ph/0203141
8 pages, ASP Conference Series, Planetary Nebulae and Their Role in the Universe
arxiv created 2002/03/08 · arxiv updated 2009/12/01
It is argued that an important fraction of PNe present large temperature variations that are not due to observational errors nor to incomplete atomic physics. Seven possible causes for these variations are reviewed, one of them is presented for the first time.