2008/06/08 by G. M. MacAlpine, Gordon M. MacAlpine, Timothy J. Satterfield · 1 citation
Physics and Astronomy · #Astrophysics and Cosmic Phenomena #Gamma-ray bursts and supernovae #Pulsars and Gravitational Waves Research #astro-ph
paper · pdf · doi:10.1088/0004-6256/136/5/2152
manuscript in AASTeX, 6 figures in .eps, submitted to Astronomical Journal
arxiv created 2008/06/08 · openalex publication_date 2008/10/16 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/04
We present new photoionization calculations for investigating gaseous regions that represent potentially expected stages of nuclear processing in the Crab Nebula supernova remnant. From comparison of the theoretical models with recent, extensive emission-line measurements, most of the emitting gas appears to be nitrogen-poor and carbon-rich. These results suggest that the precursor star had an initial mass ≳ 9.5 M ☉ .