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  • Weitere Quellen  (93)
  • NASA Technical Reports  (93)
  • Bibliographie (Seismologie)
  • ASTRONOMY
  • 1980-1984
  • 1970-1974  (93)
  • 1940-1944
  • 1974  (93)
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  • Weitere Quellen  (93)
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  • NASA Technical Reports  (93)
  • Bibliographie (Seismologie)
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  • 1980-1984
  • 1970-1974  (93)
  • 1940-1944
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  • 1
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    Thermal instability and energy relations in the convective envelopes of slowly rotating stars (1974)
    In:  CASI
    Details
    Publikationsdatum: 2006-01-11
    Beschreibung: The nonstationary convection that arises due to thermal instability in the envelopes of lower Main Sequence stars (and the sun in particular) is investigated. The convection that arises in the envelopes as a result of thermal instability is of nonstationary turbulent nature. It is shown that construction of a consistent model of the zones of turbulent convection in the stars requires the use of the complete heat flux equation with consideration of the terms that appear because of turbulence. Expressions for these additional terms in terms of averaged characteristics of the motion and eddy viscosity coefficients are derived on the basis of the Prandtl-Wasiutinsky theory.
    Schlagwort(e): ASTRONOMY
    Materialart: Interplanet. Medium and Phys. of the Magnetosphere (NASA-TT-F-784); p 203-223
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
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  • 2
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    The non-existence of the Oort cometary shell (1974)
    In:  Other Sources
    Details
    Publikationsdatum: 2011-08-16
    Beschreibung: The procedures adopted as theory for a shell of comets are shown to be invalid. Any plot of numbers of long-period comets against 1/a will automatically exhibit a peak at small values of this parameter, and cannot be inverted to demonstrate a high volume-density of aphelia in space. The positions of actual aphelion-points show no sign of any concentration at any range. Further, the aphelion-distance undergoes large almost random changes owing to planetary perturbations at each return, and present values can yield no indication of original positions. A recent attempt to save the shell-theory by making use solely of comets with large perihelion-distance is shown to rest on exactly the same errors as have done all the earlier presentations. The plain conclusions emerge that the shell-theory is devoid of any support by facts, and that the alleged shell of comets is non-existent.
    Schlagwort(e): ASTRONOMY
    Materialart: Astrophysics and Space Science; 31; Dec. 197
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
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  • 3
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    Distance to Cygnus X-1 (1974)
    In:  Other Sources
    Details
    Publikationsdatum: 2011-08-16
    Beschreibung: An evaluation of the nature of the X-ray source Cygnus X-1 depends on distance relations. The validity of distance estimates provided by Margon et al. (1973) and Bregman et al. (1973) is considered. It is concluded that the possibility of a determination of the distance of HDE 226868 to the required accuracy on the basis of reddening measurements appears unlikely. It is, therefore, thought to be premature to suggest that the X-ray source is a black hole.
    Schlagwort(e): ASTRONOMY
    Materialart: Nature; 251; Oct. 18
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
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  • 4
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    Tail structures far from the head of Comet Kohoutek. I (1974)
    In:  Other Sources
    Details
    Publikationsdatum: 2011-08-16
    Beschreibung: Two tail structures 0.1 AU from the head of Comet Kohoutek were photographed during January 1974. One was a wavy structure resembling a helix while the other was an irregular swan-like cloud. Both features were propagating down the tail at approximately 250 km/sec, and the observed speed is probably the phase speed. We discuss the physical origin of these structures and interpret the helix as a kink instability resulting from currents flowing along the tail axis.
    Schlagwort(e): ASTRONOMY
    Materialart: Icarus; 23; Dec. 197
    Format: text
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  • 5
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    Visual observations of Comet Kohoutek from Skylab III (1974)
    In:  Other Sources
    Details
    Publikationsdatum: 2011-08-16
    Beschreibung: Sketches of Comet Kohoutek drawn by the author during operations on Skylab are presented. The sketches are black and white, with darker color implying a higher observed brightness. Sketches were also made of what the isophotes would have looked like if they could have been measured. In addition, color sketches made after the flight and corresponding to each of the inflight sketches are presented. The sketches show the comet at perihelion minus 10 days and at perihelion plus 1-9 days. Sketches show the comet changing appreciably in form, color, texture, and length after perihelion. The sunward spike, visible at perihelion plus one day, is no longer visible at perihelion plus 4 days.
    Schlagwort(e): ASTRONOMY
    Materialart: Icarus; 23; Dec. 197
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
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  • 6
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    Estimations of the smoothing operator response characteristics (1974)
    In:  Other Sources
    Details
    Publikationsdatum: 2011-08-16
    Beschreibung: The mean response characteristic of the graphical smoothing method is discussed. The method is illustrated by analysis of latitude observations at Washington from 1915.9 to 1941.0. Spectral density, frequency distribution, and distribution functions are also discussed.
    Schlagwort(e): ASTRONOMY
    Materialart: Astrometrics and Astrophysics, No. 17 (NASA-TT-F-15768); p 145-148
    Format: text
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  • 7
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    The law of distribution of light beam direction fluctuations in telescopes (1974)
    In:  Other Sources
    Details
    Publikationsdatum: 2011-08-16
    Beschreibung: The distribution of deviations from mean star trail directions was studied on the basis of 105 star trails. It was found that about 93% of the trails yield a distribution in agreement with the normal law. About 4% of the star trails agree with the Charlier distribution.
    Schlagwort(e): ASTRONOMY
    Materialart: Astrometrics and Astrophysics, No. 17 (NASA-TT-F-15768); p 136-144
    Format: text
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  • 8
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    Scintillation spectra of stars and planets and dependence of their characteristics on meteorological conditions (1974)
    In:  Other Sources
    Details
    Publikationsdatum: 2011-08-16
    Beschreibung: Scintillation spectra of stars and planets were obtained at Goloseyevo. The dependence was studied of the scintillation spectral density and of the amplitude and frequency characteristics on zenith distances and aerological parameters. The differences in the scintillation spectra amplitude characteristics for white and red stars were found. The increase in the limiting frequency of the planet scintillation spectrum (as the wind becomes stronger) was studied along with the dependence of spectral characteristics on wind and star azimuth differences.
    Schlagwort(e): ASTRONOMY
    Materialart: Astrometrics and Astrophysics, No. 17 (NASA-TT-F-15768); p 125-135
    Format: text
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  • 9
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    Determination of astronomical refraction near the horizon in different seasons of the year (1974)
    In:  Other Sources
    Details
    Publikationsdatum: 2011-08-16
    Beschreibung: The results are presented of astronomical refraction measurements for zenith distances of 80-90 degrees performed in different seasons with a two inch universal instrument. The differences between observed and calculated refraction were found to exhibit seasonal variations, and the results were compared with data of atmospheric aerologic soundings. The great departures in observed refraction from that calculated with the Pulkovo tables were ascribed to temperature gradient changes within the ground kilometer layer of atmosphere.
    Schlagwort(e): ASTRONOMY
    Materialart: Astrometrics and Astrophysics, No. 17 (NASA-TT-F-15768); p 110-124
    Format: text
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  • 10
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    Calculation of the effectiveness of a gamma telescope (1974)
    In:  Other Sources
    Details
    Publikationsdatum: 2011-08-16
    Beschreibung: A calculation is given of the effectiveness of recording of gamma quanta by a gamma telescope. Consideration of the isotropic nature of the stream of gamma quanta reaching the gamma telescope revealed that low energy gamma quanta are recorded relatively more effectively, since they are recorded from a wider solid angle than higher energy gamma quanta. The problem is solved of determining the effectiveness of recording of gamma quanta and determination of their energies by a gamma telescope.
    Schlagwort(e): ASTRONOMY
    Materialart: Equipment for Space Res. (NASA-TT-F-785); p 319-334
    Format: text
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