vStndiea in Stellar Statistics 



31 



As to the méthode of observation it may be stated here that HD and HR 

 are obtained with two ZöLLWEK-pliotometer.'!, using- as stars of comparison *) a Ursse 

 Minoris for tlie brighter and X Urste Min. for the fainter stars. As to PG it is 

 also obtained with photometers of the ZoLLNER-type, but with an artificial star of 

 comparison. 



The comparison between BD and the photometric catalogues were executed 

 very conveniently with the help of a cardcatalogue of the stars in Boss' »Preliminary 

 Catalogue» as far as the brighter stars were concerned. For the fainter stars the 

 calculations were rapidl}^ made with the use of Borrough's addition-machine. 1 

 give here the comparison between BD and the Harvard Catalogues. 



Tab. 3. BD and Harvard. 



N-ßü 



^■40 ■■ 

 +.30 ■- 

 +.20 -- 

 +./0 ■- 



dû 



-./O ■■ 



-ZO - 



-.30 



-.40 









n 



BD 



HD 



Corr. 



n 



BD 



HD 



Corr. 



Corr. 



3 



3.07 



3.05 



(- .02) 



6 



3.35 



3.31 



— .04 





9 



4.48 



4.61 



+ .13 ■ 



9 



4.47 



4,194 



— .28 



(+ 0.42) 



38 



5.387 



5.303 



— .08t 



36 



5.428 



5.131 



— .297 



+ .21 



111 



6.496 



6.407 



— 0.8S 



155 



6.485 



6.150 



— .335 



+ .25 







HR 









HE 







71 



7.545 



7.528 



— .017 



134 



7.475 



7.145 



— .335 



+ .32 



180 



8.527 



8.737 



+ .210 



248 



8.595 



8.'j70 



— .125 



+ .34 



44 



9.0 



9.424 



+ .424 



150 



9.0 



9.019 



-f .019 



+ .40 



7 



9.1 



9.357 



+ -257 1 



19 



9.1 



9.113 



+ .013 



+ .24 



10 



9.2 



9.585 



+ .385 > 



25 



9.2 



9.196 



— .004 



+ .39 



5 



9.3 



9.758 



4- .458] 



15 



9.3 



9.437 



+ .137 



+ .32 



M ean + 0.31 



Fig. 3. 



*) The magnitude of a Ursse Min. is adopted to 2-» .15, that of X Ursse Min. to 6" .57. 



