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  • 1
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    General properties of HII regions in galaxies (1979)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: The structure, electron density, and dimensions of HII regions in galaxies are discussed. These parameters are correlated to the chemical composition gradient along the galactic radius, the dimensions of the three largest HII regions in the galaxy, and the amount of hydrogen in the galaxy, as well as the mass, dimensions, and total optical luminosity of the galaxy. The relationships of HII regions to star formation and galactic nucleus activity are discussed and the kinematic properties of the SB and Sab galaxies are related to the size of HII regions.
    Keywords: ASTROPHYSICS
    Type: NASA-TM-75700
    Format: application/pdf
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  • 2
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    On the possibly overluminous triple star, 13 Ceti (1976)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Description: The star system, 13 Ceti, consists of a short-period visual binary whose primary is itself a single-line spectroscopic binary. Currently existing data regarding the considered stellar system are examined, taking into account certain discrepancies. It is pointed out that the spectral type of the combined light of the system complicates any attempt to explain the observed overluminosity in terms of stellar evolution. Additional studies are recommended to clarify remaining questions concerning the characteristics of the stellar system.
    Keywords: ASTROPHYSICS
    Type: Astronomical Society of the Pacific; vol. 88
    Format: text
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  • 3
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    Hydrodynamics of primordial black hole formation (1979)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: The hydrodynamic picture of the formation of primordial black holes (PBH) at the early stages of expansion of the Universe is considered. It is assumed that close to singularity, expansion occurs in a quasi-isotropic way. Using an EVM, a spherically symmetrical nonlinear problem of the evolution of primary strong deviation from the Fridman solution was solved. What these deviations must be, so that the formation of PBH occurred was clarified. Attention was devoted to the role of pressure gradients. It is pointed out that at the moment of formation of PBH, only a small part of matter enters into it, primarily the component of perturbation. It is also pointed out that at this moment, the mass of PBH essentially is smaller than the mass considered within the cosmic horizon. The possibility of changing the mass of the PBH as a result of accretion is analyzed.
    Keywords: ASTROPHYSICS
    Type: NASA-TM-75918 , PR-347
    Format: application/pdf
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  • 4
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    Non-equilibrium processes in interstellar molecules (1979)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: The types of nonequilibrium emission and absorption by interstellar molecules are summarized. The observed brightness emission temperatures of compact OH and H2O sources are discussed using the concept of maser amplification. A single thermodynamic approach was used in which masers and anti-masers are considered as heat engines for the theoretical interpretation of the cosmic maser and anti-maser phenomena. The requirements for different models of pumping are formulated and a classification is suggested for the mechanisms of pumping, according to the source and discharge of energy.
    Keywords: ASTROPHYSICS
    Type: NASA-TM-75685 , PR-462
    Format: application/pdf
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  • 5
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    The Soviet-American Conference on Cosmochemistry of the Moon and Planets, Part 2 (1977)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: The origin and evolution of the solar system is discussed based on ground and satellite observations.
    Keywords: ASTROPHYSICS
    Type: NASA-SP-370-PT-2 , LC-75-600013 , Soviet-American Conference on Cosmochemistry of the Moon and Planets; Jun 04, 1974 - Jun 08, 1974; Moscow; Russia
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  • 6
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    X-ray bursts - The maximum mass of a neutron star (1977)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Description: A review of the great variety of observed properties of X-ray burst sources is presented, including the MXB 1730-355, called the rapid burster. Hypotheses regarding the sources of bursts are discussed, and two models for the rapid burster are described. The first postulates that they are caused by a collapsed object with a mass of approximately 10 solar masses surrounded by a disk of gas spiralling inward. The second posits a neutron star with a strong magnetic field. Theoretical questions regarding the mass of neutron stars are discussed, and prerequisites for such research are identified. Various research projects investigating these questions are described.
    Keywords: ASTROPHYSICS
    Type: Mercury; 6; July-Aug
    Format: text
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  • 7
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    Contraction of the Orion Nebula cluster-molecular cloud A complex (1977)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Description: Observational evidence is presented in support of the view that the width of the molecular lines in Orion is produced by a contraction of the cloud with a velocity directly proportional to the distance from the cloud center. The main support is provided by close agreement between the motions of the cloud and that of the stars embedded in it. A further implication of this agreement is that star formation occurred throughout the Orion cloud, rather than only in the dense center as predicted by the conventional picture of star formation.
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal; vol. 217
    Format: text
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  • 8
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    Evolution of the moon: The 1974 model (1977)
    In:  CASI
    Details
    Publication Date: 2019-08-27
    Description: The interpretive evolution of the moon can be divided now into seven major stages beginning sometime near the end of the formation of the solar system. These stages and their approximate durations in time are as follows: (1) The Beginning: 4.6 billion years ago, (2) The Melted Shell: 4.6 to 4.4 billion years ago, (3) The Cratered Highlands: 4.4 to 4.1 billion years ago, (4) The Large Basins: 4.1 to 3.9 billion years ago, (5) The Light-colored Plains: 3.9 to 3.8 billion years ago, (6) The Basaltic Maria: 3.8 to 3.0(?) billion years ago, and (7) The Quiet Crust: 3.0(?) billion years ago to the present. The contributions of the Apollo and Luna exploration toward the study of those stages of evolution are reviewed.
    Keywords: ASTROPHYSICS
    Type: The Soviet-Am. Conf. on Cosmochem. of the Moon and Planets, pt. 1; p 63-80
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  • 9
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    Chemistry between the stars (1976)
    In:  CASI
    Details
    Publication Date: 2019-08-27
    Description: A unit is presented for the secondary school teacher of physics, chemistry, astronomy, or earth sciences. Included are a list of reference materials, teaching aids, and projects. Discussion questions and a glossary are also provided. Concepts developed are: the nature of interstellar space, spectroscopy, molecular signals from space and interstellar molecules and other areas of astronomy.
    Keywords: ASTROPHYSICS
    Type: NASA-EP-127
    Format: application/pdf
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  • 10
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    Stellar map of neolithic man (1978)
    In:  CASI
    Details
    Publication Date: 2019-08-27
    Description: Observations made by ancient man are of great interest to present day astronomers. Drawings made by neolithic man in caves show a surprising sense of perspective. The discoveries in the Fern Grotto in California are of special interest. Photographs of cave drawings are included.
    Keywords: ASTROPHYSICS
    Type: NASA-TM-75468
    Format: application/pdf
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