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  • ASTROPHYSICS  (2)
  • Astrophysics  (2)
  • Earthquake precursor: prediction research  (2)
  • 1
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    The foreshock activity of the 1971 San Fernando earthquake, California (1978)
    In:  Bull. Seism. Soc. Am., Amsterdam, Schweizerbart'sche Verlagsbuchhandlung, vol. 68, no. 8, pp. 1265-1279, pp. L12S09, (ISSN 0016-8548, ISBN 3-510-50045-8)
    Details
    Publication Date: 1978
    Keywords: Seismology ; Earthquake precursor: prediction research ; Fore-shocks ; Earthquake ; Earthquake precursor: statistical anal. of seismicity ; BSSA
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    BIBLIOGRAPHY SEISMOLOGY
  • 2
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    A possible foreshock of a future large earthquake near Odawara, center Japan (1992)
    In:  Geophys. Res. Lett., Amsterdam, Schweizerbart'sche Verlagsbuchhandlung, vol. 19, no. 8, pp. 1695-1698, pp. L12S09, (ISSN 0016-8548, ISBN 3-510-50045-8)
    Details
    Publication Date: 1992
    Keywords: Seismology ; Earthquake precursor: prediction research ; Fore-shocks ; Earthquake precursor: statistical anal. of seismicity ; GRL
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    BIBLIOGRAPHY SEISMOLOGY
  • 3
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    Ray-Tracing Simulation and In-Orbit Performance of the ASTRO-H Hard X-Ray Telescope (HXT) (2016)
    In:  CASI
    Details
    Publication Date: 2019-07-20
    Description: A ray-trace simulation code for the Hard X-ray Telescope (HXT) on board the Hitomi (ASTRO-H) satellite is beingdeveloped. The half power diameter and effective area simulated based on the code are consistent with groundmeasurements within 10%. The HXT observed the pulsar wind nebula G21.5-0.9 for 105 ksec. We confirmed that theencircled energy function and the half power diameter obtained from the data are consistent with the ground measurements.
    Keywords: Astrophysics
    Type: GSFC-E-DAA-TN64667 , SPIE ASTRONOMICAL TELESCOPES + INSTRUMENTATION; Jun 26, 2016 - Jul 01, 2016; Edinburgh; United Kingdom|Space Telescopes and Instrumentation 2016: Ultraviolet to Gamma Ray; 9905; 990541
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    Ginga observation of an AM Herculis type source H0538 + 608 (1991)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: Results from a Ginga observation of the AM Her type object H0538 + 608 are presented. During the first half of the observation (pulsing state) the source showed periodic modulations caused by the white dwarf rotation, and the modulation profile was characterized by a flat top and a flat bottom. During the second half, the source was in a remarkable flaring state and the periodic modulation disappeared. The dramatic change of the X-ray light curve is interpreted in terms of a change of accretion pattern between an eclipsing spot and a noneclipsing spot. The spectrum is well described throughout by a thin thermal model including an iron K-line with equivalent width of some hundred eV, supporting the standard model for the hard X-ray emission region. The temperature in the pulsing state was found to change with the spin phase of the white dwarf. In the flaring state, the temperature showed a positive correlation with the source luminosity.
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal, Part 1 (ISSN 0004-637X); 367; 270-277
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    H0538 + 608 (= BY Camelopardalis) - An asynchronously rotating AM Herculis binary? (1992)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Description: Evidence from a concurrent X-ray/optical observing program is presented which indicates that the orbital period of the anomalous AM Her-type cataclysmic variable H0538 + 608 (BY Cam) differs from the rotational period by 1.3 +/- 0.1 percent. This finding would explain much of the unusual behavior previously exhibited in optical photometry and polarimetry. The model proposed by Ishida et al. (1991) is developed further using observations of accretion and the primary characteristics of optical and X-ray light curves and radial velocity measures of H-alpha. An optical QPO with a period of about 30 min was seen on two nights and possible causes of it are discussed.
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal, Part 1 (ISSN 0004-637X); 389; 704-713
    Format: text
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    NASA TECHNICAL REPORTS
  • 6
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    Discovery of Rapidly Moving Partial X-Ray Absorbers Within Cassiopeiae (2016)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Gamma Cassiopeiae is an enigmatic Be star with unusually strong hard X-ray emission. The Suzaku observatory detected six rapid X-ray spectral hardening events called "softness dips" in a approx.100 ks observation in 2011. All the softness dip events show symmetric softness-ratio variations, and some of them have flat bottoms apparently due to saturation. The softness dip spectra are best described by either approx.40% or approx.70% partial covering absorption to kT approx.12 keV plasma emission by matter with a neutral hydrogen column density of approx.(28) 10(exp 21)/sq cm, while the spectrum outside these dips is almost free of absorption. This result suggests the presence of two distinct X-ray-emitting spots in the gamma Cas system, perhaps on a white dwarf (WD) companion with dipole mass accretion. The partial covering absorbers may be blobs in the Be stellar wind, the Be disk, or rotating around the WD companion. Weak correlations of the softness ratios to the hard X-ray flux suggest the presence of stable plasmas at kT approx 0.9 and 5 keV, which may originate from the Be or WD winds. The formation of a Be star and WD binary system requires mass transfer between two stars; gamma Cas may have experienced such activity in the past.
    Keywords: Astrophysics
    Type: GSFC-E-DAA-TN40102 , Astrophysical Journal (e-ISSN 2041-8213); 832; 2; 140
    Format: text
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    NASA TECHNICAL REPORTS
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