Photometry of the Crab Nebula : variability and the mass of emitting gas

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 int...

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Bibliographic Details
Published in:The Astronomical journal 1991-07, Vol.102 (1), p.218-223
Main Authors: MACALPINE, G. M, UOMOTO, A
Format: Article
Language:English
Subjects:
640102 - Astrophysics & Cosmology- Stars & Quasi-Stellar, Radio & X-Ray Sources
ABUNDANCE
Astronomy
BALMER LINES
BREMSSTRAHLUNG
CHARGE-COUPLED DEVICES
CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS
COSMIC GASES
COSMIC RADIO SOURCES
CRAB NEBULA
Earth, ocean, space
ELECTROMAGNETIC RADIATION
ELECTRON DENSITY
ELEMENT ABUNDANCE
ELEMENTS
ERUPTIVE VARIABLE STARS
Exact sciences and technology
FLUIDS
GASES
HELIUM
Interstellar medium (ism) and nebulae in milky way
INTERSTELLAR SPACE
LIMITING VALUES
LUMINOSITY
MASS
NEBULAE
NONMETALS
OPTICAL PROPERTIES
PHOTOMETRY
PHYSICAL PROPERTIES
PULSARS
RADIATIONS
RARE GASES
SEMICONDUCTOR DEVICES
SPACE
SPECTROPHOTOMETRY
STARS
Stellar systems. Galactic and extragalactic objects and systems. The universe
SUPERNOVA REMNANTS
SUPERNOVAE
SYNCHROTRON RADIATION
VARIABLE STARS
VARIATIONS
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Description
Summary: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. (Author)
ISSN:0004-6256
1538-3881
DOI:10.1086/115868