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  • 1985-1989  (6)
  • 1989  (6)
Collection
Keywords
Publisher
Years
  • 1985-1989  (6)
Year
  • 1
    Electronic Resource
    Electronic Resource
    Solar and stellar magnetic fields and structures: Observations (1989)
    Springer
    Solar physics 121 (1989), S. 187-196 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract This review of stellar magnetic field measurements is both a critique of recent spectral diagnostic techniques and a summary of important trends now appearing in the data. I will discuss both the Zeeman broadening techniques that have evolved from Robinson's original approach and techniques based on circular and linear polarization data. I conclude with an ambitious agenda for developing self-consistent models of the magnetic atmospheres of active stars.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00161695
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    Paper (German National Licenses)
    Fulltext
  • 2
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    A survey of the radio continuum emission of RS Canum Venaticorum and related active binary systems (1989)
    Institute of Physics
    Details
    Publication Date: 1989-12-01
    Print ISSN: 0067-0049
    Electronic ISSN: 1538-4365
    Topics: Physics
    Published by Institute of Physics
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    PAPER CURRENT
  • 3
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    Solar and stellar observations from the South Pole (1989)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: It is noted that an astronomical observatory located at the geographic South Pole could provide significant new insights into the physical bases of stellar variability by monitoring stars for lengthy periods of time with minimal interruptions by the day-night cycle. Three broad topics that could be studied with monitoring techniques are discussed: helioseismology, asteroseismology, and magnetic phenomena on stars. Consideration is given to comparisons with studies of solarlike active phenomena on stars utilizing high-resolution spectroscopy in the optical and ultraviolet, combined with X-ray and radio observations.
    Keywords: ASTROPHYSICS
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Solar and stellar magnetic fields and structures - Observations (1989)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: A review of stellar magnetic field measurements is presented which includes both a critique of recent spectral diagnostic techniques and a summary of important trends now appearing in the data. Both the Zeeman broadening techniques using unpolarized light and techniques based on circular and linear polarization data are discussed. An agenda for the development of a self-consistent model for the magnetic atmospheres of active stars is presented.
    Keywords: ASTROPHYSICS
    Type: Solar Physics (ISSN 0038-0938); 121; 2-Jan; 187-196;
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    A survey of the radio continuum emission of RS Canum Venaticorum and related active binary systems (1989)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: Observations of 77 RS CVn and related active binary systems were made with VLA at a continuum frequency of 4.86 GHz. The results are combined with other VLA observations to produce a total number of observed sources of 122. A search for correlations of radio properties with various systemic and stellar parameters is performed. Significant correlations are found between the normalized radio luminosity L(6)/L(bol) and the normalized soft X-ray luminosity L(x)/L(bol). It is suggested that the close correlation between low-level 6-cm emission and the hot component of the soft X-ray emission observed by the Einstein solid state spectrometer is caused by both emissions being produced by the same thermal electrons.
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal Supplement Series (ISSN 0067-0049); 71; 905-930
    Format: text
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    NASA TECHNICAL REPORTS
  • 6
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    Spectral diagnostics from X-ray to radio wavelengths (1989)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: A spectral diagnostic is defined as an observable spectral quantity that can be used to measure a physical parameter characterizing the observed plasma. The first step in establishing a spectral line is to determine whether the upper state of the transition is excited primarily by collisions (typically by electrons), by a radiative process, or by recombination (either direct or cascade). The ultraviolet portion of the spectrum is emphasized as it is well studied, the background photospheric continuum is weak for cool stars, and the spectrum consists of an interesting mix of lines formed by all three mechanisms.
    Keywords: ASTROPHYSICS
    Type: IAP Astrophysics Meeting; Jun 28, 1988 - Jun 30, 1988; Paris; France
    Format: text
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    NASA TECHNICAL REPORTS
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