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    The RS CVn Binary HD 155555: A Comparative Study of the Atmospheres for the Two Component Stars (1997)
    In:  CASI
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    Publication Date: 2019-06-28
    Description: We present GHRS/HST observations of the RS CVn binary system HD 155555. Several key UV emission lines (Fe XXI, Si IV, O V, C IV) have been analyzed to provide information about the heating rate throughout the atmosphere from the chromosphere to the corona. We show that both the G and K components reveal features of a chromosphere, transition region and corona. The emission measure distribution as a function of temperature for both components is derived and compared with the RS Cvn system, HR 1099, and the Sun. The transition region and coronal lines of both stars show nonthermal broadenings of approx. 20-30 km/s. Possible physical implications for coronal heating mechanisms are discussed.
    Keywords: Astronomy
    Type: NASA/CR-97-207188 , NAS 1.26:207188
    Format: application/pdf
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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
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