Element Masses in the Crab Nebula
Abstract
Using our previously published element abundance or mass-fraction distributions in the Crab Nebula, we derived actual mass distributions and estimates for overall nebular masses of hydrogen, helium, carbon, nitrogen, oxygen and sulfur. As with the previous work, computations were carried out for photoionization models involving constant hydrogen density and also constant nuclear density. In addition, employing new flux measurements for [Ni II] λ7378, along with combined photoionization models and analytic computations, a nickel abundance distribution was mapped and a nebular stable nickel mass estimate was derived.
- Publication:
-
The Astronomical Journal
- Pub Date:
- October 2016
- DOI:
- 10.3847/0004-6256/152/4/93
- Bibcode:
- 2016AJ....152...93S
- Keywords:
-
- ISM: abundances;
- ISM: individual objects: M1;
- ISM: supernova remnants