Halo around the Crab Nebula

Astronomy and Astrophysics – Astronomy

Scientific paper

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Astronomical Models, Crab Nebula, H Alpha Line, Schmidt Telescopes, Supernovae, Helium, Shock Waves, Spectrum Analysis, Stellar Envelopes, Stellar Evolution, Supernova Remnants

Scientific paper

A model for the formation of the Crab Nebula and its halo are presented. The halo was detected using a IIIaF plate in the UK 1.2 m Schmidt Telescope employing an interference filter with a 150 A bandpass centered on H-alpha, calibrated with a step wedge illuminated with broadband red light. The surface brightness of the halo is about 2% of the night sky intensity, and is calculated to be approximately 1/20,000,000 erg/sec per sq cm per sr, corresponding to an H-alpha intensity of 7 pc/million cm, with an uncertainty of two. The model comprises a core collapse depositing 2 x 10 (to the 51st) erg in the He-rich outer core, which exploded outward, decelerated, and formed a high pressure region. The reverse shock wave drove the core material back to the center, and then supernova energy was transferred to the outer envelope of the presupernova star. Although a 0.5 solar mass would account for the present nebula, the original star is estimated to have been 12 solar masses.

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