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  • ASTROPHYSICS  (137)
  • Physics
  • 2020-2024
  • 1985-1989  (137)
  • 1980-1984
  • 1970-1974
  • 1988  (137)
  • 1
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    Toward a descriptive model of solar particles in the heliosphere (1988)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: During a workshop on the interplanetary charged particle environment held in 1987, a descriptive model of solar particles in the heliosphere was assembled. This model includes the fluence, composition, energy spectra, and spatial and temporal variations of solar particles both within and beyong 1 AU. The ability to predict solar particle fluences was also discussed. Suggestions for specific studies designed to improve the basic model were also made.
    Keywords: ASTROPHYSICS
    Type: Interplanetary Particle Environment. Proceedings of a Conference; p 3-13
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    A new interstellar polyatomic molecule - Detection of propynal in the cold cloud TMC-1 (1988)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: The detection of the acetylene derivative propynal in the cold cloud TMC-1, with an abundance that is very close to that for the related species tricarbon monoxide, is reported. Propadienone, an isomer of propynal, was not detected and is hence less abundant than either C3O or HC2CHO.
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X); 335; L89-L93
    Format: text
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  • 3
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    Nickel, argon and cobalt in the infrared spectrum of SN1987A - The core becomes visible (1988)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: Infrared spectra of supernova 1987A taken in April and November 1987 are presented, showing two distinctly different stages in the evolution of the expanding gas shell. The optical and infrared spectrum in April originated from the hydrogen envelope and show weak hydrogen lines rising above a 5,000-K photospheric continuum. The November spectrum was dominated by strong emission lines from heavy elements as well as many lines from highly excited levels of hydrogen, with peak flux levels in the lines at or slightly above the level of the continuum in April. It is concluded that the inner regions of the supernova were just becoming visible in early 1988. It is expected that these regions contain heavy elements produced by advanced nuclear burning stages in the progenitor star and in the shock wave that ejected all material external to the iron core.
    Keywords: ASTROPHYSICS
    Type: Nature (ISSN 0028-0836); 331; 505
    Format: text
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  • 4
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    Interplanetary magnetic field draping about fast coronal mass ejecta in the outer heliosphere (1988)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: The possibility that the IMF becomes draped around coronal mass ejections (CMEs) propagating rapidly through the quiescent solar wind into the outer heliosphere is investigated theoretically. The results are presented in diagrams and graphs and discussed in detail. It is found that large sunward-directed structures analogous to the Venus and cometary magnetotails should form when the CME velocity exceeds the solar-wind velocity by more than the local Alfven speed; such structures could hang up swept-up IMF flux for as long as several days. Pioneer 11 magnetic-field measurements at 6.9-9.4 AU from three 20-d periods in 1978 are examined and shown to contain some features consistent with CME draping.
    Keywords: ASTROPHYSICS
    Type: Journal of Geophysical Research (ISSN 0148-0227); 93; 2519-252
    Format: text
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  • 5
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    Collisional excitation of interstellar water (1988)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: Rates for rotational excitation of water molecules in collisions with He atoms have been obtained from a new, accurate theoretical interaction potential. Rates among the lowest 40 ortho levels are given for kinetic temperatures to 1400 K and among the lowest 29 para levels for kinetic temperatures to 800 K.
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal Supplement Series (ISSN 0067-0049); 68; 287-318
    Format: text
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  • 6
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    No cometesimals in the inner solar system (1988)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: Ultraviolet measurements made by Voyager 2, apparently showing a rapid decrease in hydrogen Lyman-alpha emission with distance from the sun, were taken by Donahue et al. (1987) as evidence for a source of atomic hydrogen in the very local interstellar medium (VLISM). The suggested source of the hydrogen is a class of small comets at solar distances of about 1 AU. This claim has been adduced as evidence for a theory that the earth is subject to a large influx of cometary material significantly affecting atmospheric evolution. The Voyager 2 data have been reanalyzed, and it is shown that no source of hydrogen in the VLISM is required other than the inflow of neutral atoms.
    Keywords: ASTROPHYSICS
    Type: Nature (ISSN 0028-0836); 335; 417-419
    Format: text
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  • 7
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    The sensitivity of gas-phase models of dense interstellar clouds to changes in dissociative recombination branching ratios (1988)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: The approach of Bates to the determination of neutral product branching ratios in ion-electron dissociative recombination reactions has been utilized in conjunction with quantum chemical techniques to redetermine branching ratios for a wide variety of important reactions of this class in dense interstellar clouds. The branching ratios have then been used in a pseudo time-dependent model calculation of the gas phase chemistry of a dark cloud resembling TMC-1 and the results compared with an analogous model containing previously used branching ratios. In general, the changes in branching ratios lead to stronger effects on calculated molecular abundances at steady state than at earlier times and often lead to reductions in the calculated abundances of complex molecules. However, at the so-called 'early time' when complex molecule synthesis is most efficient, the abundances of complex molecules are hardly affected by the newly used branching ratios.
    Keywords: ASTROPHYSICS
    Type: Astronomy and Astrophysics (ISSN 0004-6361); 194; 1-2
    Format: text
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  • 8
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    V1500 Cygni - Discovery of a magnetic nova (1988)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: Polarimetric observations of V1500 Cygni, the remnant of Nova Cygni 1975, reveal periodic variations of optical circular polarization with semi-amplitudes of about + or - 1.5 pct. Measured over a six-month baseline, the period of variation, 0.137154 + or - 0.000004 days, is 1.8 percent shorter than the stable photometric period, 0.1396129 days, obtained by Patterson (1979), and refined by Kaluzny and Semeniuk (1987). The circular polarization is interpreted as high-harmonic optical cyclotron emission from an accreting, magnetic white dwarf primary. However, the dominant system light and photometric variability are due to the heated companion star. In this picture, the prenova system was a synchronized AM Herculis-type magnetic variable. During the outburst and subsequent dense-wind phase, coupling between the white dwarf and the expanded envelope and the interaction of the orbiting secondary star were responsible for the asynchronism of the current system and the remarkable photometric variations observed in 1975-1976. Other unusual characteristics of Nova Cygni 1975 are also explained by this model.
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal, Part 1 (ISSN 0004-637X); 332; 282-286
    Format: text
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  • 9
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    The relationship between interstellar dust and the isotopic anomalies in meteorites (1988)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Work on the ways in which the isotopic anomalies found in meteorites can be regarded as the chemical memory of even larger anomalies found in interstellar dust is outlined. This approach constitutes one theory of the isotopic anomalies, standing in contrast to the idea of a spatial inhomogeneity in the early solar system owing to inhomogeneous admixture from a neighboring supernova. The four mechanisms of isotopic chemical memory in interstellar dust are: (1) thermal condensation within expanding events of nucleosynthesis; (2) different isotopic mappings onto the grain size spectrum; (3) dust components of differing age; and (4) isotope-dependent interstellar chemistry. Specific examples of each mechanism are given to illustrate how each may have contributed to known isotopic anomalies.
    Keywords: ASTROPHYSICS
    Type: Dust in the Universe; Dec 14, 1987 - Dec 18, 1987; Manchester
    Format: text
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  • 10
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    Monte-Carlo histories of refractory interstellar dust (1988)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Monte-carlo histories of 6 x 10 to the 6th individual dust particles injected uniformly from stars into the interstellar medium during a 6 x 10 to the 9th year history are calculated. The particles are given a two-phase internal structure of successive thermal condensates, and are distributed in initial radius as 1/a-cubed over the value of a between 0.01 and 0.1 micron. The evolution of this system illustrates the distinction between several different lifetimes for interstellar dust. Most are destroyed, but some grow in size. Several important consequences for interstellar dust are described.
    Keywords: ASTROPHYSICS
    Type: Dust in the Universe; Dec 14, 1987 - Dec 18, 1987; Manchester
    Format: text
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