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  • 1
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    Physical parameter profiles of selected X-ray flares (1979)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Description: Soft X-ray proportional-counter data for nine X-ray flares of class C1 to M1 occurring during the Skylab mission, have been analyzed to yield temperature, volume emission measure, electron density and thermal energy content. Profiles of these quantities are presented, using 1-min averages of 2.5-s resolution data. The event profiles are discussed and comparisons with previous studies made.
    Keywords: ASTROPHYSICS
    Type: Astronomy and Astrophysics Supplement Series; 38; Oct. 197
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    IUE observations of two high redshift /z more than 3/ QSO's (1979)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: By means of a collaboration across the Atlantic, very long exposures (about 14 hours) have been made with IUE of two high redshift QSO's during October 1978. Target acquisition and initiation was carried out at Vilspa, and the completion of the exposure and read-out of the image was executed at Goddard. The first object Q 2204-408 is an optical QSO with m(v) = 17.5 and z = 3.18 whose spectrum had just been detected earlier with a 350 minute exposure in the short wavelength spectrograph (Wilson, et al. 1978). In this case two longer exposures were obtained in both spectrographs. The other object is the radio QSO PKS 2126-158 with m(v) = 17.3 and z = 3.27 for which a detectable spectrum was obtained in the short wavelength spectrograph.
    Keywords: ASTROPHYSICS
    Type: The first year of IUE; Apr 04, 1979 - Apr 06, 1979; London
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    IUE observations of the X-ray source HZ Herculis/Her X-1 (1979)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The results of a campaign of monitoring HZ Her with the IUE satellite are presented. The spectrum and light variation outside of eclipse are fairly consistent with the Milgrom and Salpeter (1975) model for emission from the X-ray heated photosphere of the primary. Near eclipse there is UV flux in excess of the prediction of the heated photosphere model. This suggests an additional emitting component whose relative importance decreases toward shorter wavelengths. The excess flux near 1500A appears to vary with 35 day phase in a manner consistent with the model of Gerend and Boynton (1976) in which the flux contributed by the accretion disk is modulated by precession.
    Keywords: ASTROPHYSICS
    Type: The first year of IUE; Apr 04, 1979 - Apr 06, 1979; London
    Format: text
    Location Call Number Expected Availability
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    NASA TECHNICAL REPORTS
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