Photographic photometry of V 1727 CYG = 4U 2129 + 47 during 1972 - 1983

Details Photographic photometry of V 1727 CYG = 4U 2129 + 47 during 1972 - 1983 Photographic photometry of V 1727 CYG = 4U 2129 + 47 during 1972 - 1983

Dec 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990baicz..41..355h&link_type=abstract

Astronomical Institutes of Czechoslovakia, Bulletin (ISSN 0004-6248), vol. 41, Dec. 1990, p. 355, 356.

Astronomy and Astrophysics

Astronomy

Annual Variations, Astronomical Photometry, Stellar Luminosity, Variable Stars, X Ray Sources, Astronomical Photography, Binary Stars

Scientific paper

The photographic magnitudes of the variable star V 1727 Cyg, optical counterpart to the X-ray source 4U 2129 + 47, were measured on the plates taken at the Piszkesteto and Sonneberg Observatories in the years 1972 - 1983. It is shown that the actual transition between the active and inactive state occurred between September 28, 1982, and August 16, 1983.

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