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A photometric survey of the eclipsing RS CVn-type system RZ Eridani - Starspot variability, circumstellar matter, tidal evolution
Results are presented of monitoring of the RS CVn-type eclipsing binaryRZ Eridani, observed in the seven colors of the Geneva photometricsystem between November 1977 and April 1989. It is shown that theprimary is an A8-F0IV star, which was stable during the 12 years of thesurvey. The secondary component, a G8-K0IV-III star, exhibits threekinds of stellar variability: a starspot effect with a period of about35 d (stellar rotation), varying from year to year; a reflection effectof the light from the primary component, with a period equal to theorbital one (the orbital period); and a long-term variability,tentatively attributed to be due to a stellar activity cycle.
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Gözlemler ve gökölçümü verileri
| Takýmyýldýz: | Irmak |
| Sað Açýklýk: | 04h46m09.49s |
| Yükselim: | -11°33'40.3" |
| Görünürdeki Parlaklýk: | 7.656 |
| Uzaklýk: | 304.878 parsek |
| özdevim Sað Açýklýk: | 3.7 |
| özdevim Yükselim: | 6.6 |
| B-T magnitude: | 7.634 |
| V-T magnitude: | 7.655 |
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