Three years of photometry of IM Pegasi = HR 8703

Three years of photometry of IM Pegasi = HR 8703

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 three different determinations of the photometric period was 24(d).39 + or 0(d).03, a...

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Veröffentlicht in:Astrophysics and space science 1983-01, Vol.89 (1 Ja), p.53-60
Hauptverfasser: Eaton, J. A., Hall, D. S., Henry, G. W., Lovell, L. P., Stephan, C. A., Chambliss, C. R., Detterline, P. K., Landis, H. J., Louth, H., Renner, T. R.
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Sprache:eng
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Astronomy
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Zusammenfassung: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 three different determinations of the photometric period was 24(d).39 + or 0(d).03, about 1 percent shorter than the orbital period of 24(d).649 determined spectroscopically by Harper. The total range observed during these three years was for V from 5(m).60 to 5(m).85. The light curve was nearly sinusoidal but always noticieably asymmetric, with the sense reversing sometime between 1979-80 and 1980-81.
ISSN:0004-640X