COMMISSION 27 OF THE I. A. U. INFORMATION BULLETIN ON VARIABLE STARS Number 1712 Konkoly Observatory Budapest 1979 December 5 TIMES OF MINIMA OF SIX ECLIPSING VARIABLES Since 1975 observations of the times of minimum light of eclipsing variables have been frequently made at the Yonsei University Observatory in Seoul. Altogether 22 times of minima for six variable stars, RZ Cas, AR Lac, VV Ori, beta Per, AG Per and W UMa, were reported in several sources available only in Korea. As they were never distributed widely these data are essentially unknown material to those who are not in Korea. It is, thus, our purpose to collect these observations and to report them so that they may be useful to others. Table I List of times of minimum light Stars J.D. Hel. E O-C Meth. Source of 2440000+ Information RZ Cas 2691.133 10722 0.001 Pe Lee, Y.S. (1975) RZ Cas 2697.110 10727 0.002 Pe Lee, Y.S. (1975) RZ Cas 2703.086 10732 0.002 Pe Lee, Y.S. (1975) RZ Cas 2704.281 10733 0.002 Pe Lee, Y.S. (1975) AR Lac 3084.077 1869.5 -0.008 Pe Nha and Kang (1979) AR Lac 3420.227 2039 -0.011 Pe Nha and Kang (1979) AR Lac 3427.170 2042.5 -0.009 Pe Nha and Kang (1979) AR Lac 3428.163 2043 -0.007 Pe Nha and Kang (1979) VV Ori 2459.072 0 -0.007 Pg Lee and Nha (1975) beta Per 2453.063 2702 0.003 Pg Jeong (1975) AG Per 1628.7524 8223 -0.0074 Pe Nha et al. (1975) AG Per 1680.500 8248.5 0.008 Pe Nha et al. (1975) W UMa 2456.061 61741 0.002 Pg Jeong (1975) W UMa 2458.230 61747.5 0.002 Pg Jeong (1975) W UMa 2461.231 61756.5 0.000 Pg Jeong (1975) W UMa 3196.062 63959 -0.005 Pe Lee, Y.B. (1977) W UMa 3196.227 63959.5 -0.007 Pe Lee, Y.B. (1977) W UMa 3209.241 63998.5 -0.005 Pe Lee, Y.B. (1977) W UMa 3212.245 64007.5 -0.004 Pe Lee, Y.B. (1977) W UMa 3213.077 64010 -0.006 Pe Lee, Y.B. (1977) W UMa 3225.089 64046 -0.005 Pe Lee, Y.B. (1977) W UMa 3246.107 64109 -0.006 Pe Lee, Y.B. (1977) Table II Light elements used above Star Epoch Period Reference RZ Cas 2429875.6902 1.1952473 Herczeg and Frieboes-Conde (1974) AR Lac 2439376.4955 1.9831987 Chambliss (1976) VV Ori 2442459.0787 1.4853789 Eaton (1975) beta Per 2434705.5493 2.86732442 Frieboes-Conde et al. (1970) AG Per 2424946.5153 2.02872973* Semeniuk (1968) W UMa 2421856.9401 0.333637665 Huffer (1934) ^* Period is adopted from Nha et al. (1975) The data shown in Tale I are all made either with f/5 astrograph or with photoelectric photometer attached to the 40-cm reflector at the Yonsei University campus observatory, except for AG Per which was observed with the 72-cm reflector at the flower and Cook Observatory of the University of Pennsylvania. Columns 3 and 4 of Table I are derived from the light elements collected in Table II for each star. IL-SHEONG NHA Department of Astronomy and Meteorology Yonsei University Seoul, Korea JANG HAE JEONG National Astronomical Observatory Seoul, Korea References: Chambliss, C.R. 1976. Publ. A.S.P. 88, 726 [BIBCODE 1976PASP...88..762C ] Eaton, J.A. 1975, Astrophys. J. 197, 379 [BIBCODE 1975ApJ...197..379E ] Frieboes-Conde, H., Herczeg, T., and Hogg, E., 1970, A. and AP. 4, 78 [BIBCODE 1970A&A.....4...78F ] Herczeg, T. and Frieboes-Conde, H. 1974. A. and AP. 30, 259 [BIBCODE 1974A&A....30..259H ] Huffer, C.M. 1934, Astrophys. J. 79, 369 [BIBCODE 1934ApJ....79..369H ] Jeong, J.H. 1975, Master's thesis, Yonsei University Lee, W.B. and Nha, I.S. 1975, J. Korean Astron. Soc. 8, 25 [BIBCODE 1975JKAS....8...25L ] Lee, Y.B. 1977, Master's thesis, Yonsei University Lee, Y.S. 1975, Master's thesis, Yonsei University Nha, I.S. and Kang Y.W. 1979, to be published Nha, I.S., Oh, K.D. and Jeong, J.H. 1975, Yonsei Nonchong 12, 97 Semeniuk, C.M. 1968, Acta Astron. 18, 1 [BIBCODE 1968AcA....18....1S ]