Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987phdt........19b&link_type=abstract
Ph.D. Thesis Colorado Univ., Boulder.
Astronomy and Astrophysics
Astronomy
13
Brightness Temperature, Cataclysmic Variables, Coronal Holes, Flare Stars, Radio Astronomy, Solar Corona, Solar Diameter, Solar Radio Emission, Stellar Flares, Very Large Array (Vla), Astronomical Spectroscopy, Coronagraphs, Pleiades Cluster
Scientific paper
The results of observations using the Very Large Array are presented in three major sections. The first discusses maximum entropy-type image reconstruction techniques that were applied. Both single disk and interferometer data were used to generate full disk images of the sun at a wavelength of approximately 21 cm. Using a set of six such images obtained during the sun's decline from sunspot maximum to minimum, a number of previously unreported phenomena were noted. Among these: (1) a systematic decrease in quiet sun's brightness temperature as it declined to minimum; (2) a systematic decrease in the sun's radius at 21 cm; and (3) evidence for the evolution of polar coronal holes during the course of the solar cycle. The observed variation, though not noted previously at radio wavelengths, is entirely consistent with white light K coronagraph data. The results reported here explain the conflicting nature of a number of past observations. The second section presents the results of a long term survey of magnetic cataclysmic variables (CVs). Cataclysmic variables are close binary systems which contain a white dwarf accreting mass from a late-type secondary, typically a dwarf of spectral type G, K, or M. The third section presents new results on flare stars in the solar neighborhood and in the Pleiades. Of the nearly 170 sources found in the Pleiades' fields, all but two were determined to be extragalactic. Neither of the two stellar radio sources is a known flare star or a Pleiades member.
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