Discovery of eclipses in the X-ray source HD 155638

Details Discovery of eclipses in the X-ray source HD 155638 Discovery of eclipses in the X-ray source HD 155638

Jul 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983apj...270l..79b&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X), vol. 270, July 15, 1983, p. L79-L81.

Astronomy and Astrophysics

Astrophysics

14

Eclipsing Binary Stars, Stellar Spectrophotometry, Variable Stars, X Ray Sources, Electrophotometry, Light Curve

Scientific paper

Photometry at three different observatories shows that HD 155638, a G8 IV star with a remarkably active chromosphere and corona, undergoes total eclipses every 27.55 days. The overall eclipse duration appears to be about 0.065 P, and there appears to be a constant phase lasting about 0.035 P. A representative time of mideclipse is JD 2,445,214.7. The depths are 0.23 mag in V, 0.43 mag in B, and 0.76 mag in U. There is also a nearly sinusoidal RS CVn type of light variation outside eclipse, with about the same period and with an amplitude of 0.09 mag in V, B, and U.

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