Photoelectric Observations and UBVRI Light Curves Analysis of Algol

Abstract

UBVRI photometry of Algol was carried out from December of 1988 to March of 1991 at Chungbuk National University Observatory and a total of 3465 observations in U, B, V, R, I were obtained. Three times of primary minimum light of JDHel 2447898.0938, JDHel 2448265.1205 and JDHel 2448288.0598, and two secondary minimum light of JDHel 2447908.1014 and JDHel 2448275.146 were determined from our observations. We analyzed simultaneously the UBVRI light curves of the Algol system with the Wilson-Devinney method for the determination of the photometric parameters. Indivisual masses for the 3 components of Algol are derived as m1=3.36, m2=0.76, m3=1.6 in solar mass and radii as R1=2.97, R2=0.76 in solar radius using i=82.¡Æ47, q=0.227, r1=0.2102, r2=0.2512 of our solution and some parameter of the spectroscopic solution of Hill et al. (1971). Our results is similar to those reported by Kim(1989). The temperature of Algol C, T3=8800 was obtained by means of fitting l1, l2, and l3 of five colors to Planckian curve, and R3=1.6 R is derived from itsresult. It is believed that its semidetached configuration of Algol A and B is the consequence of case B mass transfer. According to its location in a mass-radius diagram, Algol B may have evolved significantly in its Hburnning phase.