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Light Curve Analysis and Evolutionary Status of the RS CVn type Eclipsing Binary RZ Eridani

  • P. Vivekananda Rao (a1), B. V. N. S. Prakash Rao (a1) and M. B. K. Sarma (a1)

Extract

Photoelectric observations of the long period RS CVn type eclipsing binary RZ Eridani were made with the 1.2m reflecting telescope of the Japal – Rangapur Observatory during the observing seasons 1976-79. We could not obtain a full light curve in any one season and therefore the combined light curve is used for analysis. No distortion wave was found in this system. The period of the system (39ḍ282466) is found to be constant during the period 1906 to 1979. From W-D solution we obtained the eccentricity to be zero whereas Popper (private communication) from his spectroscopie studies, suggested a value of e = 0.339 for the eccentricity. Such disagreement between the photometric & spectroscopic eccentricity values is reported in the system SX Cas (Struve 1944 Ap.J, 99, 89., Shao 1967 A.J, 72, 480). This might be due to circumstellar matter covering the whole system. The ultraviolet excess found by us in RZ Eri is similar to that found in systems like SX Cas, RX Cas, βLyr & W Ser

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