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  • 1
    Electronic Resource
    Electronic Resource
    Limb-darkening and solar cycle variation of sunspot intensities (1984)
    Springer
    Solar physics 90 (1984), S. 17-30 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract New observations of the umbral limb-darkening are presented. We find a real and significant decrease in the umbra/photosphere intensity ratio towards the limb. This result contrasts the findings of previous authors and we believe this to be the first time such a decrease is reported. Our conclusion is based on broad band pinhole photometer intensity observations of 22 large sunspots covering the spectral region 0.387–2.35 μm. The data are selected from measurements on approximately 600 days during the last 15.5 yr. The application of the limb-darkening data to the study of the temperature stratification in the umbra is briefly discussed. The observations confirm the suggestion that the umbra/photosphere intensity ratio seems to be a linear function of the phase in the solar cycle.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00153781
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    Paper (German National Licenses)
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  • 2
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    Far-ultraviolet and X-ray emission of the long period RS CVn star Sigma Geminorum (1988)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: Observations of the RS CVn binary Sigma Gem were obtained in 1984 with the IUE and Exosat satellites. The longitudes of two starspot regions relative to the cental meridian are derived from the photometric data using an improved value of the orbital period. The observations support the theory that large active regions associated with starspots are responsible for the enhanced line emission commonly seen in RS CVn systems.
    Keywords: ASTROPHYSICS
    Type: Astronomy and Astrophysics (ISSN 0004-6361); 192; 1-2; 234-248
    Format: text
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    NASA TECHNICAL REPORTS
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