Other
Scientific paper
Feb 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982apj...253..696d&link_type=abstract
Astrophysical Journal, Part 1, vol. 253, Feb. 15, 1982, p. 696-706.
Other
65
Abundance, Carbon, Crab Nebula, Iue, Supernova Remnants, Ultraviolet Spectra, Emission Spectra, Helium, Main Sequence Stars, Neutron Stars, Oxygen, Stellar Mass, Ultraviolet Spectrophotometers
Scientific paper
Ultraviolet spectroscopy of the Crab Nebula done by the International Ultraviolet Explorer satellite is described, and an estimate of the carbon abundance is made, noting data reduction to remove spectral defects caused by radiation hits. The important C IV 1549, He II 1640, and semiforbidden C III 1908 emission line intensities were measured and upper limits placed on other ultraviolet features for the brightest filamentary region in the Nebula. The emission lines imply an average ionic abundance ratio n(C+2)/n(O+2) in the range from 0.4 to 1.5 in the observed gaseous condensations. The elemental abundance ratio of carbon to oxygen is probably in the same range. Analysis shows that there is no perceptible excess of carbon due to presupernova nucleosynthesis in the observed region. The large helium abundance, small carbon and oxygen abundances, and presence of a neutron star in the Crab Nebula suggest that the presupernova star had a mass close to eight solar masses.
Davidson Kris
Fesen Robert A.
Gull Ted R.
Harvel Ch. A.
Kafatos Menas
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