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  • 1970-1974  (5)
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Year
  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Solar physics 30 (1973), S. 283-300 
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Mean profiles of eighteen neutral iron lines of varying strengths were measured at selected positions from the center of the solar disk to the limb. These profiles were obtained by rapid photoelectric scanning of the spectrum with a double-pass spectrometer. The Fe i lines selected are representative of most of the stronger low-lying transitions in the neutral iron atom. In addition to the iron lines, this observational program includes center-to-limb measurements of three Ti ii lines and of the Ca i resonance line λ4226.7. The line profiles are presented here in graphical form after correction for instrumental effects and normalization to the local disk center continuum.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Solar physics 19 (1971), S. 289-296 
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A low-noise photoelectric scan which includes the predicted position of the Cli transition 4s 4 P 5/2-4 p 4 D 0 7/2 provides inconclusive evidence for the presence of the line in the solar photospheric spectrum. An upper limit logN(Cl) ⩽ 5.5 is derived. It is pointed out that the fundamental vibration rotation band of HC1 at 3.3 μ should be detectable in the sunspot spectrum unless logN(Cl) 〈 4.6. Sunspot spectra may also provide the isotopic abundance ratio N(Cl35)/N(Cl37). A new derivation of the chlorine abundance for the Orion nebula is presented: logN(Cl) ≈ 5.8. It is suggested that a cosmic abundance logN(Cl) = 5.5 to 5.8 be adopted.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract New center-to-limb measurements in FeI lines show changes in both the line profiles and the limb darkening curves that appear to be characteristic of many other solar lines. Here we seek the constraints placed on the atmospheric model by these effects. We find that in addition to a depth varying source function we must also allow the ratio of the continuous absorption coefficient to the total absorption coefficient to pass through a minimum in the mid-photosphere. Such an effect is consistent with inward increases of the Doppler width and damping constant in the upper photosphere and an inward increase of the ionization for both iron and hydrogen in the low photosphere.
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We report high resolution measurements of the center-to-limb variation of the Mgi line at 4571.1 Å. This forbidden line is of interest because it should be formed in LTE. Comparison of our measurements with the Harvard-Smithsonian Reference Atmosphere show that the line center radiation originates in the temperature minimum region from 330 to 550 km above the point where τ continuum = 1. Observations near the limb confirm that the temperature minimum is ∼4200K.
    Type of Medium: Electronic Resource
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  • 5
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract From observations made at Kitt Peak the true central intensities of 40 Fraunhofer lines distributed between λλ 3083–7699, for the center of the solar disk, are derived and given in tabular form. The paper includes a description of the optical system - telescope and spectrograph. The methods of observation and reduction of the data are discussed.
    Type of Medium: Electronic Resource
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