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Three years of photometry of IM pegasi = HR8703 |
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| Authors: | J A Eaton D S Hall G W Henry L P Lovell C A Stephan C R Chambliss P K Detterline H J Landis H Louth T R Renner D R Skillman |
| Institution: | 1. Dyer Observatory, Vanderbilt University, Nashville, Tennessee, USA 3. Hickox Observatory, Chagrim Falls, Ohio, USA 4. Kutztown State College, Kutztown, Pennsylvania, USA 5. Landis Observatory, Locust Grove, Georgia, USA 6. Louth Observatory, Sedro Woolley, Washington, USA 7. Scuppernong Observatory, Dousman, Wisconsin, USA 8. Skillman Observatory, College Park, Maryland, USA |
| Abstract: | Differential photometry of this K1 IV–III p RS VNn-type binary in 1978–79, 1979–80, and 1980–81 at eight different observatories shows that the variability, discovered orignally by Herbst, is periodic. The mean of three different determinations of the photometric period was 24d.39±-0d.03, about 1% shorter than the orbital period of 24d.649 determined spectroscopically by Harper. The total range observed during these three years was 5 m .60<V<5 m .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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