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  • ASTROPHYSICS  (3)
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  • 1
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    Empirical continuum modeling for IUE low-dispersion spectra (1988)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: A numerical procedure for empirically determining a 'continuum' level in low-dispersion spectra from the IUE is described. The technique was developed for the automated fitting of SWP-LO (1150 A - 2000 A) spectra of stars of late spectral type, but it is more widely applicable.
    Keywords: ASTROPHYSICS
    Type: Astronomical Society of the Pacific, Publications (ISSN 0004-6280); 100; 1129-113
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Far-ultraviolet observations of the Delta-Scuti variable Beta Cassiopeiae (1987)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: FUV (115-200-nm) observations of Beta Cas, obtained at resolutions 5 and 0.15 A by the IUE during September 1984, are reported and analyzed. The data are presented graphically and compared with results for Procyon, a sharp-lined F star similar in temperature to Beta Cas. A sharp factor-of-two increase in H I Ly-alpha flux on a time scale comparable to its Delta Sct pulsation period was observed, but the data were insufficient to determine whether the increase was flarelike or pulsation-related. The outer edges of the Beta Cas emission are shown to be significantly wider than those of Procyon.
    Keywords: ASTROPHYSICS
    Type: Stellar pulsation; Aug 11, 1986 - Aug 15, 1986; Los Alamos, NM; United States
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    IUE and Einstein survey of late-type giant and supergiant stars and the dividing line (1990)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: Results are presented on an IUE UV survey of 255 late-type G, K, and M stars, complementing the Maggio et al. (1990) Einstein X-ray survey of 380 late-type stars. The large data sample of X-ray and UV detections make it possible to examine the activity relationship between the X-ray and the UV emissions. The results confirm previous finding of a trend involving a steeply-dropping upper envelope of the transition region line fluxes, f(line)/f(V), as the dividing line is approached. This suggests that a sharp decrease in maximum activity accompanies the advancing spectral type, with the dividing line corresponding to this steep gradient region. The results confirm the rotation-activity connection for stars in this region of the H-R diagram.
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal, Part 1 (ISSN 0004-637X); 361; 570-589
    Format: text
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    NASA TECHNICAL REPORTS
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