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  • 1985-1989  (3)
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Year
  • 1
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    Unknown
    The ultraviolet spectrum of Beta Lyrae (1987)
    Institute of Physics
    Details
    Publication Date: 1987-12-01
    Print ISSN: 0067-0049
    Electronic ISSN: 1538-4365
    Topics: Physics
    Published by Institute of Physics
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    PAPER CURRENT
  • 2
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    A study of the P-Cygni lines in the ultraviolet spectrum of Beta Lyrae (1986)
    In:  Other Sources
    Details
    Publication Date: 2013-08-29
    Description: The properties of the mass loss from the nondegenerate interacting binary system of beta Lyrae are investigated by analyzing the P-Cygni line profiles in the UV spectrum and considering these to be emitted in the wind outflow from the B8II primary component. Observed UV lines obtained by IUE are compared with theoretical models obtained using Sobolev's approximation. The models give satisfactory fittings. Simultaneous fitting of the resonance lines of Al II (1670 A) and Al III (1863 A) show that if the lines are emitted in the same region of the outflowing shell, as the line widths indicate, the electron temperature in the region is 23,500 K, and the mass loss is 2 times 10 to the minus 7th power solar masses/yr.
    Keywords: ASTRONOMY
    Type: ESA Proceedings of an International Symposium on New Insights in Astrophysics. Eight Years of UV Astronomy with IUE; p 385-387
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    The ultraviolet spectrum of Beta Lyrae (1987)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: The high-resolution UV spectrum of Beta Lyrae observed with the IUE satellite between 1980 and 1986 is analyzed. A complete list of line identifications for the entire spectral range of the IUE (1225-3125 A) is presented. The main spectral features are P Cygni profiles of resonance lines of high ionization states typical of stellar winds, some of which are combined with a broad emission feature due probably to an accretion disk; P Cygni profiles due to moderately ionized atoms in the iron group (mostly Fe III and Ni III); and absorption lines of elements in lower ionization stages, such as S II, Si II (higher multiplets), Ni II, and a large number of Fe II lines.
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal Supplement Series (ISSN 0067-0049); 65; 695-720
    Format: text
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    NASA TECHNICAL REPORTS
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