374 



28 



Table 14. 



Gaultier 



phgr. 



11 



O—C 



weight 



Gaultier 



phgr. 



/; 



0—C 



weight 



no. 



magn. 







P 



no. 



magn. 







P 





m 



m 



m 



m-'^ 





m 



m 



m 



m '.i 



144 



2-82 



— 18 



( + ■22) 



4925 



8 



8^21 



+ ■15 



+ •04 



1121 



219 



3-53 



—22 



(-f-^ll) 



4944 



227 



8-34 



+ ■11 



—02 



3046 



38 



3-57 



— 21 



(+•11) 



4391 



27 



8^38 



+ ■14 



+ •01 



1717 



71 



3-80 



— 20 



( + ■10) 



4612 



99 



8^44 



+ ■20 



+ •06 



2244 



90 



413 



—19 



( + •08) 



5154 



132 



8^48 



+ •14 



■00 



3913 



49 



4-18 



—22 



( + ■05) 



3701 



204 



8^59 



+ ■16 . 



+ •01 



1048 



224 



4-94 



—19 



+ ■01 



5052 



177 



860 



+ ■17 



+ •02 



3017 



185 



5-30 



— 19 



— 03 



4182 



121 



8^63 



+ •15 



■00 



3466 



34 



5-37 



—18 



— 03 



4536 



118 



8^66 



+ •19 



+ ■03 



2089 



46 



5-49 



— 21 



— 07 



3263 



59 



8^87 



+ •17 



— 01 



1624 



76 



5-69 



—13 



— 01 



4608 



44 



8^90 



+ •16 



—02 



1766 



252 



6-04 



—12 



— 03 



4101 



126 



9^00 



+ •23 



+ ■04 



2891 



133 



6-31 



—02 



+ ■05 



6263 



45 



9^28 



+ ■11 



— 10 



1223 



78 



6-37 



— 11 



— 05 



4631 



24 



9 43 



+ •22 



— 01 



1525 



236 



6-56 



—09 



—05 



4749 



193 



9^46 



+ •23 



•00 



1790 



113 



6-76 



— 05 



— 03 



5655 



104 



9^67 



+ •21 



— 04 



2055 



267 



6-77 



— 03 



— 01 



2401 



173 



9-69 



+ •27 



+ •02 



1627 



145 



6-84 



+ •01 



+ ■03 



5609 



66 



9^85 



+ •23 



— 04 



1556 



134 



6-95 



■00 



+ •01 



5400 



53 



10^23 



+ •19 



— 11 



455 



295 



7-00 



+ •03 



+ ■03 



2533 



159 



10^29 



+ •26 



— 05 



1679 



191 



7-03 



+ ■06 



+ ■06 



5286 



65 



10 33 



+ •29 



— 02 



402 



63 



7-24 



+ ■04 



+ ■02 



3764 



64 



10^40 



+ ■24 



— 08 



1086 



137 A 



7-28 



—Ol 



— 04 



948 



189 



10^43 



+ •28 



— 04 



1366 



94 



7-44 



+ ■08 



+ ■04 



5107 



137 B 



10^53 



+ ■37 



+ •04 



473 



281 



7-52 



+ ■06 



+ ■01 



2129 



181 



10^60 



+ •24 



— 10 



958 



263 



7-59 



+ ■02 



— 04 



2631 



62 



10-67 



+ ■30 



— 05 



1147 



231 



7-60 



+ ■06 



•00 



3895 



266 



10-69 



+ •30 



— 05 



258 



135 



7-85 



+ ■12 



+ ■04 



4099 



103 



10-73 



+ •52 



+ •17 



1225 



141 



7-86 



+ ■10 



+ ■02 



4049 



194 



10^82 



+ •36 



•00 



645 



73 



7-99 



+ ■13 



+ ■04 



3107 



84 



10^86 



+ •35 



— 01 



453 



239 



8-10 



+ ■08 



— 02 



3180 



180 



10^86 



+ •35 



— 01 



1185 



86 



8-19 



+ ■14 



+ •03 



3014 



290 



10-95 



+ •34 



— 03 



367 



56 



8-21 



+ ■13 



+ •02 



2573 



102 



10-98 



+ •28 



— 10 



398 



the Pleiades. It Is therefore of interest to see what is the constant difference of 

 magnitude between stars of the same colour in the Pleiades and the Hyades. 



According to B. A. N. 35 the 5 Pleiades Gaultier 90, 49, 224, 185 and 34 have 

 the mean photographic magnitude 4'"'882 and the mean '^^^'t value r576, while the 

 corresponding values for the 10 stars H. R. 1473, 1387, 1392, 1394, 1620, 1479, 

 1427, 1444, 1380 and 1388 belonging to the Hyades are m^g = 4™-865 and '='h = r976. 

 For stars of the apparent photographic magnitude 4'""87 therefore '^''/t is '40 greater 

 for the Hyades than for the Pleiades corresponding to J Ix = '"'24. Comparing the 

 same 5 Pleiades as just mentioned with the 7 Hyades H. R. 1389, 1473, 1394, 1479, 

 1444, 1427 and 1380 the mean photographic magnitude according to the Göttingen 

 Actinometry is in both cases 4"^"81 and the mean value of H' = 6 +- (//— 6)/l'02, 

 where H is the visual Harvard magnitude (comp. A. N. 5000, 118), is 4°^"97 in the 

 case of the Pleiades and 4'""66 in the case of the Hyades, thus giving a difference 

 in colour index of '"'31. The mean of the two values for this difference '"'24 and 



