Three years of photometry of IM Pegasi = HR 8703

Details Three years of photometry of IM Pegasi = HR 8703 Three years of photometry of IM Pegasi = HR 8703

Jan 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983ap%26ss..89...53e&link_type=abstract

Astrophysics and Space Science (ISSN 0004-640X), vol. 89, no. 1, Jan. 1983, p. 53-60.

Astronomy and Astrophysics

Astrophysics

13

Astronomical Photometry, Binary Stars, Light Curve, Orbital Elements, Ubv Spectra, Variable Stars, Electrophotometry, Maxima, Minima, Stellar Spectrophotometry

Scientific paper

Differential photometry of this K1 IV-III p RS CVn-type binary in 1978-79, 1979-80, and 1980-81 at eight different observatories shows that the variability, discovered originally by Herbst, is periodic. The mean of the three different determinations of the photometric period was 24d.39 ± od.03, about 1% shorter than the orbital period of 24d.649 determined spectroscopically by Harper. The total range observed during these three years was 5m.60 < V< 5m.85. The light curve was nearly sinusoidal but always noticeably asymmetric, with the sense reversing sometime between 1979-80 and 1980-81.

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