COMMISSION 27 OF THE I.A.U. INFORMATION BULLETIN ON VARIABLE STARS Number 2914 Konkoly Observatory Budapest 9 July 1986 HU ISSN 0374 - 0676 MAGNITUDES OF BRIGHT VARIABLES IN THE DRACO DWARF GALAXY Magnitudes for several of the brighter variables in the Draco dwarf spheroidal galaxy have been measured on a series of plates (IIa-O or 103a-O + GG385 filter) which are centered on several regions in the vicinity of the galaxy. These magnitudes are listed in Table I in which those plates prefixed with an "A" were taken with the University of Western Ontario 1.2-m telescope and the remaining plates were taken with the 1.5-m telescope of the Observatoire du Mont Megantic of the Universite de Montreal. The plates were measured on the UWO iris photometer using a standard sequence given by Stetson (1979). Because the plates cover somewhat different regions all the variables do not appear on some of the plates. TABLE I Blue magnitudes of Draco variables V36 V134 V141 V157 V194 V203 Period (days) 0.625463 0.592284 0.900868 0.936465 1.59013 --- PLATE HEL.JD MAGNITUDES A 569 41161.708 --- 19.4: 19.3 19.6: --- 18.9 A1545 44432.785 19.75 18.8 19.3 19.3 18.75 19.0 A1546 44433.641 20.5: 19.3 19.3 19.4 18.35 18.8 A1550 44459.628 19.85 19.3 19.05 19.75 18.7 18.85 A1552 44459.835 19.9: 19.2 19.4 19.5 18.9 18.85 A1553 44460.622 --- 18.75 19.2 19.5 18.35 18.9 341 44469.651 19.3 --- 19.3 --- --- --- 375 44691.703 19.65 19.2 20.2 19.5 18.75 19.25 A1585 44816.783 20.25: 19.15 20.05 19.3 18.2 19.3 A1586 44816.830 19.75: 19.25 --- 18.5 18.3 --- 460 45082.780 --- 19.65 19.95 18.55 18.9 19.4 593 45791.832 20.4 19.65 19.8 19.0 18.55 19.5 594 45792.586 --- 18.65 --- 18.9 18.4: --- 595 45792.686 --- 18.6 --- 18.8 18.15 --- 596 45792.773 --- --- --- 19.35 18.3: --- 598 45793.672 --- 19.05 --- 18.9 18.65 19.5 599 45793.751 19.75 --- 19.6 19.0 19.0 19.3 600 45793.840 20.0 18.7 19.1 19.35 19.35 19.5 602 45794.692 --- 19.5 19.3 19.2 18.3 19.5 603 45794.803 --- 19.55 19.2 19.35 19.35 19.5 Four of the measured stars, variables 134, 141, 157, and 194, have been shown to be anomalous Cepheids while V36 is an RR Lyrae star. Variable 203, although blue in color, was reported by Baade and Swope (1961) to show a slow variation of half a magnitude. The star was not observed to vary on the plates of Zinn and Searle (1976) but our observations confirm the type of variation reported by Baade and Swope. The periods given in Table I are those which best fit both our data and the data of Baade and Swope as well as the data of Zinn and Searle. The periods are close to those given by Baade and Swope with the exception of V134 for which our data confirm the new period found by Zinn and Searle. The authors would like to thank Philip Rice for iris measures of some of the plates. A. W. would like to thank the staff of the Observatoire du Mont Megantic for their helpful assistance. We also gratefully acknowledge the financial support of the Natural Sciences and Engineering Research Council of Canada. AMELIA WEHLAU SERGE DEMERS Department of Astronomy Departement de Physique and The University of Western Ontario Observatoire du Mont Megantic London, N6A 3K7, Canada Universite de Montreal Montreal, 83C 3J7, Canada References: Baade, W. and Swope, H. 1961, Astron. J. 66, 300. [BIBCODE 1961AJ.....66..300B ] Stetson, P. B. 1979, Astron. J. 84, 1149. [BIBCODE 1979AJ.....84.1149S ] Zinn, R. and Searle, L. 1976, Astrophys. J. 209, 734. [BIBCODE 1976ApJ...209..734Z ]