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  • 1
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    Abundances of Planetary Nebulae NGC 7662 and NGC 6741 (2001)
    In:  Other Sources
    Details
    Publication Date: 2011-08-23
    Description: The ISO and IUE spectra of the elliptical nebulae NGC 7662 and NGC 6741 are presented. These spectra are combined with the spectra in the visual wavelength region to obtain a complete, extinction corrected, .spectrum. The chemical composition of the nebulae is then calculated and compared to previous determinations. The abundances found are compared to determinations made in other nebulae using ISO data. A discussion is given to see if possible evolutionary effects can be found from the abundance differences.
    Keywords: Astrophysics
    Type: Astronomy and Astrophysics (ISSN 0004-6361); Volume 380; 684-694
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    An ISO and IUE Study of Planetary Nebula NGC 2440 (2002)
    In:  CASI
    Details
    Publication Date: 2013-08-29
    Description: The infrared and ultraviolet spectra of planetary nebula NGC 2440 is presented. The observations were made respectively by the Infrared Space Observatory (ISO) and International Ultraviolet Explorer (IUE) These data, in conjunction with published optical observations have been used to derive electron temperature and density. A trend of electron temperature with ionization potential is found. In particular the electron temperature increases from 11000 to 18000 K with increasing IBM. The electron density has a constant value of 4500/cu cm in agreement with previous determination. The chemical abundance has been derived for the following elements; helium, carbon, nitrogen, oxygen, neon, sulfur and argon. The ionization correction factor turns out to be very small (almost unnecessary) for all species except sulfur.
    Keywords: Astrophysics
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Abundances of Planetary Nebula NGC 5315 (2002)
    In:  CASI
    Details
    Publication Date: 2013-08-29
    Description: The ISO and IUE spectra of the elliptical nebula NGC 5315 is presented. These spectra axe combined with the spectra in the visual wavelength region to obtain a complete, extinction corrected, spectrum. The chemical composition of the nebulae is then calculated and compared to previous determinations. The HST Nicmos observations of the nebula in 3 emission lines are also presented. These observations are used to determine the helium abundance as a function of position in the nebula. A discussion is given of possible evolutionary effects.
    Keywords: Astrophysics
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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