Photometry of the Crab Nebula - Variability and the mass of emitting gas

Details Photometry of the Crab Nebula - Variability and the mass of emitting gas Photometry of the Crab Nebula - Variability and the mass of emitting gas

Jul 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991aj....102..218m&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 102, July 1991, p. 218-223. Research supported by NSF, American Astronomical Society

Astronomy and Astrophysics

Astronomy

17

Astronomical Photometry, Crab Nebula, Interstellar Gas, Pulsars, Charge Coupled Devices, Spectral Emission, Spectrophotometry, Supernovae, Synchrotron Radiation

Scientific paper

The luminosity of the Crab Nebula in H-beta He I 5876, and the synchrotron continuum was measured. The data suggest that the continuum has remained constant within measurement errors over the last 30 yr. Lower limits for the mass of line emitting gas have been estimated using a method that takes into account spatial variations in the line intensities across the nebula. Depending upon assumptions involving electron densities and helium abundances, the calculated mass ranges between 1 and 2 solar mass range.

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