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  • ASTROPHYSICS  (2)
  • Magnetic fields  (1)
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  • 1
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    Unknown
    Detection of a magnetic region on HR 1099 (1990)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: The paper reports results of a magnetic field measuring campaign on the active K component of the RS CVn system HR 1099, using Zeeman-Doppler imaging. A localized magnetic field is detected near quadrature (phase 0.85). Assuming this magnetic region has a circular shape, its longitude and latitude are, respectively, estimated to be 86 + or - 4 deg and 5 + or - 5 deg. This equatorial region is largely monopolar, has a mean field strength of 985 + or - 270 G, covers 18 + or - 3 percent of the total stellar surface and may be colocalized with a bright photospheric spot.
    Keywords: ASTROPHYSICS
    Type: Astronomy and Astrophysics (ISSN 0004-6361); 232; 1, Ju
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Photospheric imaging of the RS CVn system HR 1099 (1992)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Spectropolarimetric, spectroscopic, and photometric observations of the RS CVn binary system HR 1099 = V711 Tau (K1IV+G5V) were made from Oct. 1988 to Jan. 1991. From Doppler imaging of the unpolarized spectra and the corresponding data, two maximum entropy images of the temperature distribution of the active K1 subgiant at epochs 1988.9 and 1990.9 were derived. Zeeman-Doppler imaging of the circularly polarized spectra has led to the first magnetic maps of a star other than the sun. The fragmentary observations made at epoch 1989.6 suggest that the star's magnetic field lines were emerging radially and/or poloidally from an equatorial warm region at that time, quite likely one of these reconstructed in the 1988.9 temperature image.
    Keywords: ASTROPHYSICS
    Type: Astronomy and Astrophysics (ISSN 0004-6361); 265; 2; p. 682-700.
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
    Electronic Resource
    Electronic Resource
    Zeeman-Doppler imaging of solar-type stars: Multi line technique (1996)
    Springer
    Solar physics 164 (1996), S. 417-428 
    Details
    ISSN: 1573-093X
    Keywords: Solar type stars ; Magnetic fields ; Spectropolarimetry
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract In this work, a multi-line spectropolarimetric detection using an Echelle spectrograph is described. The polarization of Zeeman effect is detected by the use of more than 200 lines observed in the solar type star, HR1099. Using the statistics analysis in a sample of 200 lines, we found on the average a polarization signal of about 3 × 10−4.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00146653
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    Paper (German National Licenses)
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