The geometry, composition, and mass of the Crab Nebula

Details The geometry, composition, and mass of the Crab Nebula The geometry, composition, and mass of the Crab Nebula

Jul 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...342..364m&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 342, July 1, 1989, p. 364-378. Research supported by NSF.

Astronomy and Astrophysics

Astrophysics

50

Abundance, Astronomical Spectroscopy, Crab Nebula, Interstellar Chemistry, Neutron Stars, Stellar Composition, Forbidden Transitions, H Beta Line, Helium, Nickel, Stellar Mass

Scientific paper

Interference filter images and long-slit spectroscopy are presented which show that much of the brighter filamentary gas in the Crab Nebula is involved in large structures consisting of a nearly pure helium band or torus across the neutron star and bipolar, helium-rich lobes. It is inferred that the SN precursor may have initially had a mass of 20-30 solar masses, and that the strongest forbidden Ni II emission coincides with regions of relatively low helium abundance in the north-east part of the nebula. The results support a scenario in which interaction and mixing occurs between an ambient interstellar cloud and material produced in the SN.

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