2005/06/21 by T.‐H. Lee, T. -H. Lee, S. Kwok
Physics and Astronomy · Social Sciences · #Astronomy and Astrophysical Research #Cosmic dust #Educational Leadership and Practices #Extinction (optical mineralogy) #Ionization #Line (geometry) #Orientation (vector space) #Planetary nebula #Shell (structure) #Stellar, planetary, and galactic studies #astro-ph
paper · pdf · doi:10.1086/432875
published as Astrophys.J.632:340-354,2005 · 39 pages, including 21 figure pages and 1 table page; accepted for publication in the Astrophysical Journal; figure quality reduced; full resolution copy available at http://www.noao.edu/staff/thlee/cv/thlee05.pdf.gz
arxiv created 2005/06/21 · openalex publication_date 2005/10/03 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
The effects of dust extinction on the departure from axisymmetry in the morphology of planetary nebulae (PNs) are investigated through a comparison of the radio free-free emission and hydrogen recombination line images. The dust extinction maps from five compact PNs are derived using high-resolution (~0 1) Hα and radio maps of the HST and VLA. These extinction maps are then analyzed by an ellipsoidal shell ionization model including the effects of dust extinction to infer the nebulae's intrinsic structure and orientation in the sky. This method provides a quantitative analysis of the morphological structure of PNs and represents a step beyond qualitative classification of morphological types of PNs.