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  • ASTROPHYSICS  (546)
  • SPACE SCIENCES
  • 1980-1984  (546)
  • 1982  (546)
  • 1
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    The evolution of massive stars (1982)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Description: The hypotheses underlying theoretical studies of the evolution of massive model stars with and without mass loss are summarized. The evolutionary tracks followed by the models across theoretical Hertzsprung-Russell (HR) diagrams are compared with the observed distribution of B stars in an HR diagram. The pulsational properties of models of massive star are also described.
    Keywords: ASTROPHYSICS
    Type: B Stars With and Without Emission Lines, Parts 1 and 2; p 199-229
    Format: text
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  • 2
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    Long Periodic Terms in the Solar System (1982)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: The long period variations of the first eight planets in the solar system are studied. First, the Lagrangian solution is calculated and then the long period terms with fourth order eccentricities and inclinations are introduced into the perturbation function. A second approximation was made taking into account the short period terms' contribution, namely the perturbations of first order with respect to the masses. Special attention was paid to the determination of the integration constants. The relative importance of the different contributions is shown. It is useless, for example, to introduce the long period terms of fifth order if no account has been taken of the short period terms. Meanwhile, the terms that have been neglected would not introduce large changes in the integration constants. Even so, the calculation should be repeated with higher order short period terms and fifth order long periods.
    Keywords: ASTROPHYSICS
    Type: NASA-TM-76994 , NAS 1.15:76994
    Format: application/pdf
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  • 3
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    High resolution observations of magnesium II 2800 A in Alpha Centauri A - The density of interstellar magnesium II and the stellar chromospheric profiles (1982)
    In:  Other Sources
    Details
    Publication Date: 2019-08-13
    Description: The profiles are virtually identical with the solar profiles except for the presence of an absorption feature near line center in the h and k lines of Alpha Centauri A. It is found that this absorption feature can be explained by interstellar absorption of Mg II along the line of sight. The average density of Mg II is found to be 2.75 plus or minus 0.7 x 10 to the -7th/cu cm, in good agreement with the previously determined values in the solar vicinity in the direction of Alpha CMa and Alpha Lyr.
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal; vol. 252
    Format: text
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  • 4
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    An X-ray survey of supernova remnants in the Large Magellanic Cloud (1982)
    In:  Other Sources
    Details
    Publication Date: 2019-07-27
    Description: Preliminary observation results for SNRs in the LMC are presented, and the current status of programs investigating these observational data is assessed. High Resolution Imager maps indicate that the remnant diameters used in early rate calculations were systematically underestimated. A preliminary SN rate of 1/110-350 years is derived upon reconsideration of these data. It is noted that most of the remnants detected in the LMC have very soft spectra, and would be undetectable as X-ray sources at distances of 5-10 kpc in the galactic plane.
    Keywords: ASTROPHYSICS
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  • 5
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    An optimist's guide to supernovae (1982)
    In:  Other Sources
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    Publication Date: 2019-07-27
    Description: There are some hints that a satisfactory agreement between observations and models is developing in several areas of supernova research. The light curves and spectra of Type I supernovae look so much like the models that they may well have their origin in the synthesis of Ni-56 in the explosion of a compact star. Type II supernovae are found where massive stars form, have light curves that correspond to 10 to the 51st ergs suddenly deposited inside a red supergiant, and may in fact be the explosions of massive stars. Some young supernova remnants, such as Cas A, show abundance patterns that bear a striking resemblance to those seen deep inside models of massive stars on the verge of destruction. Observations of old supernova remnants provide energy estimate of 10 to the 51st ergs - just the amount needed for the models of the outbursts.
    Keywords: ASTROPHYSICS
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  • 6
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    Supernovae and the formation of galaxies (1982)
    In:  Other Sources
    Details
    Publication Date: 2019-07-27
    Description: Attention is given to the cumulative effect of many SNs in a galaxy, especially a young galaxy, as well as the effect of the blast wave resulting from the combination of all individual SNs on the intergalactic medium (IGM). It is suggested that the IGM can be shock-heated by this process, so that in the late stages of an individual expanding galaxy's shock a shell may form whose mass is many times greater than that of the seed galaxy. If this shell fragments, due to gravitational instability, it will give rise to a new generation of galaxies. SN explosions may thereby provide a hydrodynamic amplifier of some significance in the process of galaxy formation.
    Keywords: ASTROPHYSICS
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  • 7
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    X-ray spectroscopy and imagery of supernova remnants with the Einstein Observatory (1982)
    In:  Other Sources
    Details
    Publication Date: 2019-07-27
    Description: The two complementary spectroscopic instruments of the Einsten Observatory make possible X-ray spectroscopy of SNRs with considerably increased sensitivity and spectral resolution. The Solid State Spectrometer is a cryogenically cooled detector with 160 eV resolution, which suffices not only for the separation of lines due to different elements, but also the resolution of H-like, He-like and neutral lines from the same element for Si and above. The Focal Plane Crystal Spectrometer uses Bragg crystals to achieve excellent spectral resolution, but at the expense of sensitivity. Both instruments operate over most of the 0.2-4 keV energy band of the Einstein telescope, and are able to detect most of the important X-ray lines except the K lines of Fe and Ni.
    Keywords: ASTROPHYSICS
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  • 8
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    Supernovae and the origin of the solar system (1982)
    In:  Other Sources
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    Publication Date: 2019-07-27
    Description: A review is presented of the astrophysical reasoning that links supernovae to the origin of the solar system. Topics examined concerning the supernova connections include the abundances of the nuclides at the time the solar system formed, the collapse of a solar cloud by supernova triggering, the origins of isotopic anomalies in solar system samples, and the sputtering of interstellar dust with the attendant chemical and isotopic evolution of the interstellar medium. The controversies surrounding each of these topics are critically examined, focusing on the issues arising from the discovery of the isotopic anomalies in meteorites.
    Keywords: ASTROPHYSICS
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  • 9
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    The origin of the Crab Nebula and electron capture supernova of 8-10 solar-mass stars (1982)
    In:  Other Sources
    Details
    Publication Date: 2019-07-27
    Description: (Previously announced in STAR as N81-32097)
    Keywords: ASTROPHYSICS
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  • 10
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    X-rays from Wolf-Rayet stars observed by the Einstein Observatory (1982)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Preliminary results of three X-ray surveys are presented. Out of a sample of 20 stars, X-rays were detected from four Wolf-Rayet stars and two O8f(+) stars. The detected stars have about the same mean value as O stars for the X-ray to total luminosity ratio, L(x)/L = 10 to the -7th, but exhibit a much larger variation about the mean. The spectral energy distributions are also found to be like that of O stars in that they do not exhibit large attenuation of X-rays softer than 1 keV. This indicates that for both the O stars and WR stars much of the X-ray emission is coming from hot wisps or shocks in the outer regions of the winds and not from a thin source at the base of the wind. The general spectral shape and flux level place severe restrictions on models that attribute the lack of hydrogen emission lines to extremely high temperatures of the gas in the wind.
    Keywords: ASTROPHYSICS
    Type: In: Wolf-Rayet stars: Observations, physics, evolution; Sep 18, 1981 - Sep 22, 1981; Cozumel; Mexico
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