Other
Scientific paper
Mar 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984baicz..35...78h&link_type=abstract
Astronomical Institutes of Czechoslovakia, Bulletin (ISSN 0004-6248), vol. 35, March 1984, p. 78-87.
Other
4
Horizontal Branch Stars, Stellar Activity, Stellar Spectrophotometry, Visible Spectrum, X Ray Sources, Astronomical Photography, Brightness Distribution, Histograms, Light Curve, Optical Properties, Periodic Variations, Photographic Plates, Stellar Rotation
Scientific paper
822 observations of X-ray system HZ Her/Her X-1 on Sonneberg sky-patrol-camera plates are interpreted with the following main results: (1) altogether 3 (and possibly 4) active and 3 (possibly 4) inactive states were revealed during the time span 1928 - 1979, (2) the comparison of individual active-state light curves shows no clear differences, (3) a very quick transition between active and inactive state JD 243 1313.382 -JD 243 1321.403 was observed. Some other studies of the optical data were carried out and are briefly described.
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