Light curves of SZ Piscium for 1977 and 1978 |
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| Authors: | Joel A Eaton Franco Scaltriti M Cerruti-Sola M B K Sarma B D Ausekar Santo Catalano Marcello Rodono |
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| Institution: | (1) Department of Physics and Astronomy, Vanderbilt University, USA;(2) Torino Astronomical Observatory, Italy;(3) Nizamiah Observatory, Osmania University, India;(4) Catania Astrophysical Observatory, Italy;(5) Present address: Astrophysical Observatory, Italy |
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| Abstract: | We present a relatively completeV-band light curve of SZ Psc for 1978 and a partial light curve for 1977. From the 1978 light curve we derive a new time of primary minimum, JD 2443823.674±0.001, and a Russell-model solution,i=75°.8±0°.1,r
h
=0.096±0.003,r
c
=0.351±0.001, andL
h
=0.253±0.002. The hotter component of this system is a F5-8 main-sequence star, the cooler component a K3-4 star well above the main sequence. The system is detached with the larger component filling only 82% of its Roche lobe. The distortion wave in this RS CVn-type binary seems not to migrate regularly as do those in many other such systems, but rather seems to change phase and amplitude more erratically. Between 1977 and 1978 its phase stayed practically constant while its amplitude decreased by a factor of three. We discuss the implications of this behavior for the spot model of RS CVn-type activity. We find that the traditional comparison star for SZ Psc, HD 219018, is very likely a constant star contrary to a recent suggestion that it is variable. Its brightness and colors,V=7.705, (B-V)=0.628, and (V-I)
c
=0.688, are those of a G2V star.Visiting Astronomer, Kitt Peak National Observatory, which is operated by AURA, Inc., under contract with the National Science Foundation, and Visiting Astronomer, Prarie Observatory, University of Illinois. |
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