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  • 1985-1989  (9)
Collection
Keywords
Publisher
Years
Year
  • 1
    Electronic Resource
    Electronic Resource
    Volcanic Winters (1988)
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Earth and Planetary Sciences 16 (1988), S. 73-99 
    Details
    ISSN: 0084-6597
    Source: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Topics: Geosciences , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1146/annurev.ea.16.050188.000445
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    Paper (German National Licenses)
    Fulltext
  • 2
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    Unknown
    Evolution of massive stars in very young clusters and associations (1985)
    Institute of Physics
    Details
    Publication Date: 1985-11-01
    Print ISSN: 0004-637X
    Electronic ISSN: 1538-4357
    Topics: Physics
    Published by Institute of Physics
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    PAPER CURRENT
  • 3
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    Stellar evolution at high mass with convective core overshooting (1985)
    Institute of Physics
    Details
    Publication Date: 1985-05-01
    Print ISSN: 0004-637X
    Electronic ISSN: 1538-4357
    Topics: Physics
    Published by Institute of Physics
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    PAPER CURRENT
  • 4
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    Volcanic Winters (1988)
    Annual Reviews
    Details
    Publication Date: 1988-05-01
    Print ISSN: 0084-6597
    Electronic ISSN: 1545-4495
    Topics: Geosciences , Physics
    Published by Annual Reviews
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    PAPER CURRENT
  • 5
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    Periodicity of the earth's magnetic reversals (1986)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: Results are presented from an attempt to perform a relatively comprehensive analysis of the evidence for a periodicity, with harmonics, of the observed regular reversals of the earth's magnetic field. The database considered covers 296 reversals over the past 165 Myr. Histograms with bins 1 Myr apart reveal only 30 Myr reversal patterns. The reversal dates are fitted to a linear periodic function and a spectrum is computed for the residuals at the adopted dates. The possible presence of multiple periodicities is evaluated and over various time intervals. The analysis shows that a recently observed 15 Myr periodicity is probably a harmonic of the 29.5-30.5 Myr period. The calculations do not confirm an inherent magnetic reversal property of the earth. The reversals may arise from tectonic events or from impacts from extraterrestrial objects.
    Keywords: GEOPHYSICS
    Type: Nature (ISSN 0028-0836); 322; 444-446
    Format: text
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    NASA TECHNICAL REPORTS
  • 6
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    Stellar evolution at high mass with convective core overshooting (1985)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: The transition from stellar evolution models with no convective core overshooting (CCO) at all to models in which homogeneous mixing due to CCO reaches far beyond the formal convective core boundary is systematically explored. Overshooting is parameterized in terms of the ratio d/H(p), where d is the distance of convective overshoot beyond the formal convective core boundary and H(p) is the local pressure scale height. It is concluded that CCO in very massive main sequence stars produces a great expansion of the stellar envelope if d/H(p) is large but not excessively large. CCO does not entirely suppress convective instability above the overshoot zone in the envelopes of main sequence stars more massive than about 15 solar masses. A general comparison of theoretically constructed isochrones for young stars with observed main sequence turnups indicates that the observed turnups are longer, brighter, and cooler at the tip than those expected on thfe basis of standard evolutionary theory.
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal, Part 1 (ISSN 0004-637X); 292; 222-227
    Format: text
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  • 7
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    Terrestrial record of the solar system's oscillation about the galactic plane (1985)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: A new study is presented of the observational evidence pertaining to the theory which attributes the episodic component of the earth's impact cratering record over the past 600 Myr to gravitational encounters between the solar system and interstellar clouds that cause comets to fall into the solar system and impact the earth. Contrary to a claim by Thaddeus and Chanan (1985), the vertical scale height of the clouds seems to be sufficently small and the sun's vertical trajectory sufficiently large for the modulating effect of the sun's galactovertical motion to be detectable in the terrestrial record of impact cratering with at least a 50 percent a priori probability.
    Keywords: ASTRONOMY
    Type: Nature (ISSN 0028-0836); 317; 338-341
    Format: text
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  • 8
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    Evolution of massive stars in very young clusters and associations (1985)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: Statistics concerning the stellar content of young galactic clusters and associations which show well defined main sequence turnups have been analyzed in order to derive information about stellar evolution in high-mass galaxies. The analytical approach is semiempirical and uses natural spectroscopic groups of stars on the H-R diagram together with the stars' apparent magnitudes. The new approach does not depend on absolute luminosities and requires only the most basic elements of stellar evolution theory. The following conclusions are offered on the basis of the statistical analysis: (1) O-tupe main-sequence stars evolve to a spectral type of B1 during core hydrogen burning; (2) most O-type blue stragglers are newly formed massive stars burning core hydrogen; (3) supergiants lying redward of the main-sequence turnup are burning core helium; and most Wolf-Rayet stars are burning core helium and originally had masses greater than 30-40 solar mass. The statistics of the natural spectroscopic stars in young galactic clusters and associations are given in a table.
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal, Part 1 (ISSN 0004-637X); 298; 521-527
    Format: text
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  • 9
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    Basaltic fissure eruptions, plume heights, and atmospheric aerosols (1986)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: Convective plumes that rise above Hawaiian-style fire fountains consist of volcanic gases, aerosols, fine ash, and entrained heated air. Plume theory has been applied to observational estimates of the rate of thermal energy release from large fire fountains. The theoretically predicted heights of maintained plumes agree very well with the heights found from actual observations. Predicted plume heights for both central-vent (point-source) and fissure (line-source) eruptions indicate a stratospheric penetration by plumes that form over vents with very high magma-production rates. Flood basalt fissure eruptions that produce individual lava flows with volumes greater than 100 cu km at very high mass eruption rates are capable of injecting large quantities of sulfate aerosols into the lower stratosphere, with potentially drastic short-term atmospheric consequences, like acid precipitation, darkening of the sky, and climatic cooling.
    Keywords: ENVIRONMENT POLLUTION
    Type: Geophysical Research Letters (ISSN 0094-8276); 13; 725-728
    Format: text
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