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  • ASTROPHYSICS  (1,039)
  • Organic Chemistry  (802)
  • 2020-2024
  • 1985-1989  (1,841)
  • 1989  (1,841)
Collection
Keywords
Publisher
Years
  • 2020-2024
  • 1985-1989  (1,841)
Year
  • 1
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    Binary models for the progenitor of SN 1987A (1989)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Description: Binary models are used to examine the possibility that the progenitor of SN 1987 is a component of a binary system. Certain ranges of parameter space in which binary evolution produces progenitors that are applicable to models of SN 1987A are considered. The proposed binary models are capable of making definite predictions that can be checked against observations.
    Keywords: ASTROPHYSICS
    Type: ; : Visual information
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    The composition of comets (1989)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Description: The present discussion of recent studies concerning cometary composition gives attention to the results obtained by in situ measurements of Comet Halley's dust composition by Vega 1's impact mass spectrometer, which discovered a mineral fraction that appears to be CI chondritic, as well as an organic fraction consisting of highly unsaturated hydrocarbons. The mineral fraction of comets appears to form a core that is embedded in essentially organic material; the spectroscopic invisibility of carbon is due to its presence in the cometary dust. The mass of most dust particles is found to be in the 10 to the -12th to 10 to the -14th g range. A considerable fraction of the dust grains serves as an extended source of gas in the inner coma.
    Keywords: ASTROPHYSICS
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  • 3
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    Comet Halley: The view from Pioneer Venus (1989)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: The plans to scan Halley's Comet at close range using the Pioneer Venus Orbiter are discussed. The composition of comets, their paths through space, and the history of comet encounters are examined. An ultraviolet spectrometer aboard the spacecraft will determine the composition of the gaseous coma and will measure the total gas production during its passage. The Pioneer Venus Orbiter will observe the comet for five weeks before solar interference with communications occurs as Venus passes on the far side of the Sun from Earth. Diagrams of the solar system and the relationship of the comet to the planets and the Sun are provided.
    Keywords: ASTROPHYSICS
    Type: NASA-NF-127 , NAS 1.20:127
    Format: application/pdf
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  • 4
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    Physics of the central engine (1989)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Description: Physical processes which may be important in the central engines of AGNs are discussed. Black hole accretion models have been elaborated during the past few years, and provide a plausible framework for jet and spectrum formation. However, the specific mechanisms responsible for producing the observed continuum radiation remain uncertain. Consideration is given to nonthermal models for the IR continuum, constraints on thermal plasma, and the production of relativistic electrons.
    Keywords: ASTROPHYSICS
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  • 5
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    The peculiar planetary nebula in M22 (1989)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Description: The source discovered by the IRAS satellite near the center of the globular cluster M22, IRAS 18333-2357, has been studied using the IUE satellite and a ground-based optical telescope. The northern component of the close pair of stars is not a member of the cluster. The southern component is a hot star with T(eff) of about 50,000 K illuminating a small planetary nebula and is a member of M22. Both the planetary nebula and its central star are extremely hydrogen deficient. The luminosity of the central star is in good agreement with that expected on theoretical grounds and with the observed luminosity of the tip of the red giant branch.
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal, Part 1 (ISSN 0004-637X); 346; 803-807
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  • 6
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    Relativistic Gravitational Experiments in Space (1989)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: The results are summarized of a workshop on future gravitational physics space missions. The purpose of the workshop was to define generic technological requirements for such missions. NASA will use the results to direct its program of advanced technology development.
    Keywords: ASTROPHYSICS
    Type: NASA-CP-3046 , NAS 1.55:3046 , Jun 28, 1988 - Jun 30, 1988; Annapolis, MD; United States
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  • 7
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    FGK stars and T Tauri stars: Monograph series on nonthermal phenomena in stellar atmospheres (1989)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: The purpose of this book, FGK Stars and T Tauri Stars, like all other volumes of this series, is to exhibit and describe the best space data and ground based data currently available, and also to describe and critically evaluate the status of current theoretical models and physical mechanisms that have been proposed to interpret these data. The method for obtaining this book was to collect manuscripts from competent volunteer authors, and then to collate and edit these contributions to form a well structured book, which will be distributed to an international community of research astronomers by NASA and by the French CNRS.
    Keywords: ASTROPHYSICS
    Type: NASA-SP-502 , NAS 1.21:502 , LC-89-600317
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  • 8
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    The slow nova V1819 Cygni (Nova Cygni 1986) (1989)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Description: Spectrophotometric and spectropolarimetric observations of the slow nova Cygni 1986 were obtained with the 36-in Pine Bluff Observatory telescope beginning about one week after maximum and continuing for one-two years after maximum. An E(B-V) value of about 0.35 is found. In the months following maximum light, the Balmer decrement was extremely steep and variable with time. Departures from case B radiative transfer noted throughout most of the observational period are consistent with self-absorption of the Balmer lines due to high densities in parts of the nova shell. The results suggest that at 11 months after maximum the shell density was about 10 to the 7th/cu cm, dropping to about 10 to the 6th/cu cm two years after maximum.
    Keywords: ASTROPHYSICS
    Type: Astronomical Journal (ISSN 0004-6256); 98; 297-310
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  • 9
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    Space telescope searches for black holes in galactic nuclei (1989)
    In:  CASI
    Details
    Publication Date: 2019-08-27
    Description: The Hubble Space Telescope (HST) will allow astronomers to obtain luminosity profiles, rotation curves, and velocity dispersions at angular scales that are an order of magnitude superior to those obtained previously. This enhanced spatial resolution will greatly improve the sensitivity for detecting centrally condensed matter in nearby galactic nuclei including, possibly, black holes.
    Keywords: ASTROPHYSICS
    Type: Relativistic Gravitational Experiments in Space; p 110-113
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  • 10
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    C II forbidden line emission from spiral galaxies (1989)
    In:  Other Sources
    Details
    Publication Date: 2019-07-27
    Description: Measurements of 158-micron forbidden emission taken from a sample of 13 gas-rich galaxies are analyzed. The new data are combined with the previous sample of six infrared-bright galaxies. The 158-micron line emission line is bright in all of the galaxies detected, amounting to between 0.1 and 0.2 percent of the total nuclear far-infrared luminosity, and is therefore one of the primary gas coolants in these regions. A close association between 158-micron line emission and CO line emission is noted, with the integrated 158-micron/CO line intensity ratio being substantially less in galaxies than in Galactic star-formation regions. However, for the starburst galaxies the integrated line intensity ratio is the same as that for star-formation regions in the Galaxy.
    Keywords: ASTROPHYSICS
    Type: Physics and Chemistry of Interstellar Molecular Clouds - MM and Sub-MM Observations in Astrophysics; Sept. 22-25, 1988; Zermatt; Switzerland
    Format: text
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