The Astrophysical journal . osely with those made at Cambridge. To reducethe results to the same scale, the Cambridge magnitudes have beenchanged by + and + , and the phases by+* and —,in Figs. 1 and 2 respectively. This indicates that the period of + 204200 is ^^, instead of MINOR CONTRIBUTIONS AND NOTES i8i S ANTLIAK. The accuracy attainable witli the pliotoineter described above isillustrated by the following observations of the variable star, S star has a period of 7 , which is the shortest known, exceptin the case of variables in clusters. In Circ
The Astrophysical journal . osely with those made at Cambridge. To reducethe results to the same scale, the Cambridge magnitudes have beenchanged by + and + , and the phases by+* and —,in Figs. 1 and 2 respectively. This indicates that the period of + 204200 is ^^, instead of MINOR CONTRIBUTIONS AND NOTES i8i S ANTLIAK. The accuracy attainable witli the pliotoineter described above isillustrated by the following observations of the variable star, S star has a period of 7 , which is the shortest known, exceptin the case of variables in clusters. In Circulars Nos. 23 and 25, itwas shown that the period of U Pegasi, which was at one time sup-posed to be shorter than that of any other variable, should really bedoubled. The alternate minima were bright and faint, the differencein magnitude amounted to and was determined with a probableerror but little exceeding one hundredth of a magnitude. It there-fore appeared important to see if S Antliae belonged to the same class. Fig. 2. of variables, and if its period should be doubled. A series of measure-ments was accordingly made by Professor Wendell on different nightsnear the times of mininja, care being taken that some of the minimashould correspond to an odd, and others to an even number of periodsof variation, ^. The comparison star was —28° 7347, distant light curve was then formed from these measures, and residualstaken from it. On two nights E was odd, 11229 and 11349, and themeans of the corresponding residuals were -) and ; onthree nights E was even, 11306, 11340, and 11346, and the meanresiduals were -|- , —, and -j- The assumed value ofthe difference in magnitude of S Antliae when at minimum and —28°7347, was — Accordingly, the mean difference in magnitude 182 MIXOR CONTR/BUT/OjVS AND NOTES at minimum when ^ was odd, was —, and when ^ was even,— It seems impossible ihat thousandths of a magnitude shou
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectspectru, bookyear1895
