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  • 1
    Electronic Resource
    Electronic Resource
    Graphite Particle Model for NML Cygnus (1968)
    [s.l.] : Nature Publishing Group
    Nature 220 (1968), S. 896-897 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The spectral type of NML Cygnus is believed6'7 to be M6 la, and the effective temperature appropriate to this class8 is ~ 2,700 K. A colour excess J&B-V - 3 has been estimated7, but this value is probably somewhat uncertain. With a ratio ^y/^B-V - 3-1, for small graphite particles, we have a ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/220896a0
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  • 2
    Electronic Resource
    Electronic Resource
    Interstellar Extinction by Quartz Grains (1968)
    [s.l.] : Nature Publishing Group
    Nature 217 (1968), S. 1236-1237 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] From an approximate calculation, Knacke1 has claimed that silica grains of radii 0*2 would fit the observed interstellar extinction curve in the wavelength range 0-3-l-5(jt to within about 15 per cent, but the extension of the observed extinction curve into the far ultraviolet region4'5 has ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/2171236a0
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  • 3
    Electronic Resource
    Electronic Resource
    Narrow-band Infrared Photometry of α Ori (1970)
    [s.l.] : Nature Publishing Group
    Nature 227 (1970), S. 1333-1334 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The observations were made with our standard multi-band photometer to which we added four additional interference filters. Mars was used as a calibration source outside the Earth's atmosphere and was found to be a good 240 K black body at 5, 10 and 22 pirn. These broad-band observations were based ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/2271333a0
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  • 4
    Electronic Resource
    Electronic Resource
    Unified Model for Interstellar Extinction and Polarization (1967)
    [s.l.] : Nature Publishing Group
    Nature 213 (1967), S. 895-896 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] It has been shown by Stecher and Donn5 that a size-distribution of graphite particles could reproduce the structure of the extinction curve up to ~ 2000 A, but again no agreement is possible for shorter wavelengths. We have now performed theoretical extinction computations for graphite grains ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/213895a0
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  • 5
    Electronic Resource
    Electronic Resource
    On the Question of Interstellar Diamonds (1969)
    [s.l.] : Nature Publishing Group
    Nature 224 (1969), S. 570-570 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] More serious objections exist regarding the suggestion by Saslaw and Gaustad that diamonds may form and slow rapidly in conditions appropriate to cool stellar atmospheres. It is well known that graphite is the stable carbon phase below about 104 kbar. This occurs because of the lower free energy of ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/224570a0
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  • 6
    Electronic Resource
    Electronic Resource
    Equivalent width of interstellar molecular lines (1974)
    Springer
    Astrophysics and space science 26 (1974), S. 179-182 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We have made an analysis of the observed equivalent widths of the lines of Lyman and Werner bands by Smith. The H2 column densities of 3×1019 to 1020 and the excitation temperature of 80 to 150 K satisfy the observations. This temperature refers to the kinetic temperature. We have also discussed the importance of getting the excitation temperature from lines of H2 and other heteronuclear diatomic molecules for the same star and from different regions of space.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00642633
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  • 7
    Electronic Resource
    Electronic Resource
    Equivalent width of molecular lines in stars (1977)
    Springer
    Astrophysics and space science 49 (1977), S. 389-398 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We have calculated the expected equivalent widths of the individual rotational lines of the Lyman band of H2 and (A-X) band of CO and SiO for Main Sequence stars. The results indicate that the lines of H2 should be observable in absorption up toT e≲9000 K. The lines of CO are found to be much weaker than those of H2 lines. A discussion of these results is presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00641988
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  • 8
    Electronic Resource
    Electronic Resource
    Intensity of the infrared radiation from interstellar grains in the solar neighborhood (1970)
    Springer
    Astrophysics and space science 6 (1970), S. 474-480 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The expected intensity distribution of the infrared radiation in the solar neighborhood from the grain models of dirty ice, graphite and graphite core-dirty ice mantle has been calculated. It is found that the expected intensity from grain models at 100 μ agrees reasonably well with the observations of Hoffmann and Frederick.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00653865
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  • 9
    Electronic Resource
    Electronic Resource
    Analysis of the hyades giant stars ε and γ Tau (1970)
    Springer
    Astrophysics and space science 8 (1970), S. 86-89 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Two hyades giant stars, ε and γ Tau, have been studied from an analysis of strong line profiles. We get for ε Tau,T e =4750K and logg=2.7, and for γ Tau,T e =4700K and logg=2.8. Hydrogen-to-metal ratio for the two stars is nearly the same as that of solar value.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00651658
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  • 10
    Electronic Resource
    Electronic Resource
    Convection in normal stars and metal-deficient stars (1969)
    Springer
    Astrophysics and space science 3 (1969), S. 552-563 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The depths at which convection starts have been calculated for main sequence stars and giant stars of various effective temperature and hydrogen-to-metal ratios. It is found that for late-type stars ofT e≲4400 K convenction stars at τ≲0.1. In metal-deficient stars convection starts at shallower optical depths compared to normal stars of the same spectral type. The larger the metal deficiency, the shallower is the depth at which convection starts. The importance of convection in the study of metal-deficient stars and late type stars are also discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00704860
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