Variable Stars. 



273 



7600 



Aitken, Pt[obei-t] G[rant]. Measures 

 of ODB hundred and iitty-five new double 

 stars. Berkeley, Lick ()bs., Univ. C'al., 

 Bull., Xo. 61, [1904]. (6-18). Separate. 

 30.5 era. 



One huudi-ed new double 



stars. Bei-kelev, Lick Obs., Univ. Cal. 

 Bull., No. 66, [1904], (61-68). Separate. 

 30.5 cm. 



Doolittle, Eric. ^leau results of the 

 measui-es of 227 double stars. Astr. J., 

 Boston, Mass., 23, 1903, (175-176). 



Espin, T. [H.] E. [C.]. Xew double 

 stars. London, Mon. Xot. R. Astr. Soc, 

 65, 1905, (710-713). 



Xew double stars. London, 



Mon. Xot. R. Astr. Soc, 66, 1906, (145- 

 147). 



7530 DISCUSSIOX OF ORBITS. 

 DIMEXSIOXS, MASS AXD 

 DISTAXCE OF BIXARY 

 SYSTEMS. 



Aitken, R[obert] G[rant]. The orbit 

 of e HvcU-ie AB. San Francisco, Cal., 

 Pub. Astr. Soc. Pac, 15, 1903, (84-86). 



The orbit of ,8 Delphini. 



[Reprint.] Pop. Asti'., Xorthfield, Minu., 

 11, 1903, (28-34). 



Bergstrand, Oesten. Ueber die 

 "Wirkung der atmosphai-ischen Dispersion 

 auf die Bestinimung der jahi-Jichen Paral- 

 laxen der Fixsterne. [Parallaxe des 

 Doppelstems 61 Cvgni.] Astr. Xachr., 

 Kiel, 167, 1905, (241-254). 



Biesbroeck, G. van. Yerzeichnis von 

 Doppelsterabahnen. Astr. X'achr., Kiel, 

 167, 1905, (75-76). 



Doberck, W. On the orbit of Castor. 

 Astr. Xachr., Kiel, 166, 1904, (145-148). 



On the orbit of ^-Sanrittarii. 



Astr. Xachr., Kiel, 166, 1904, (149-150). 



On the orljit of Sii-ius. 



Astr. Xachr., Kiel, 166, 1904, (321-326). 



Hadley, S. M. Masses of binary stars. 

 Pop. Astr., Xorthfield, Minn., ll" 1903, 

 (240-242). 



Lau, H. E. Le systeme de I'etoile 

 polaire. Paris, Bui. Soc. astr. France, 

 1903, (442-444). 



Eoberts, Alex[ander] ^V. Further 

 note on the density and prolateness of 

 close binary stars. London, Mon. Xot. R. 

 Astr. Soc, 65, 1905, (706-710). 

 (e-9246) 



7600 VARIABLE ST A US, IX. 



CLUDIXG NEW STARS. 



Approximate data for 1903.0 of short 

 period variable stars. Pop. Astr., Xorth- 

 field, Minn., 11, 1903, (99-100). 



Approximate magnitudes of variable 

 stars Dec. 10, 1902; [Jan.] 10, 190[3] ; 

 Feb. 10, Mar. 10, 1903; April 10, 1903 ; 

 May 10, 1903 ; Aug. 10, 1903 ; Sept. 

 10,"l903; Oct. 10, 1903: Xov. 10, 1903. 

 Pop. Astr., Xorthfield, Minn., 11. 1903, 

 (52, 99, 213, 271, 339, 403, 457, 510, 

 572), [En-atum]. Ih., (225). 



Approximate magnitudes of variable 

 stars Dec. 10, 1903 ; Jan. 1", 1904 ; 

 Feb. 10, 1904: [Mar.] 10, 1904; AprQ 

 10, 1904; May 10, 1904; Augu.st 10, 

 1904; Sept. 10, 1904; Oct. -10, 1904; 

 Xov. 10, 1904. I'op. A.str., Xorthfield, 

 Minn., 12, 1904, (61, 141, 209, 278, 356, 

 421, 495, 562, 623, 674-675). 



Maxima of SZ (Y^) Cvgni. Pop Astr., 

 Xorthfield, Minu., 11, 1903, (212). 



Maxima of UY Cvgni. Pop. Astr., 

 Xorthfield, Minn., 11, 1903, (98, 157, 

 210, 272, 335, 406, 458, 509) ; 12, 1904, 

 (64, 139, 207, 276, 352, 418, 498, 564, 

 625, 678). 



Maxima of RZ Lyr;D. Pop. Astr., 

 Xorthfield, Minn., 12,' 1904, (207, 279, 

 354, 418, 498, 564, 625, 678). 



Maxima of Y Lyrae. Pop. Astr., 

 Xorthfield, Minn., 11, 1903, (272, 406, 

 458, 509, 571) ; 12, 1904, (64, 139, 207, 

 276, 352, 416, 495, 564, 625, 678). 



Maxima of U Pegasi. Pop. Astr., 

 X^'orthfield, Minn., 11, 19lt3, (50, 98, 212, 

 272, 335, 406, 457, 509) ; 12, 1904, (64). 



Minima of variable stars of the Algol 

 t^■pe. Pop. Astr., Xorthfield, Minn., 11, 

 1903, (48, 97-98, 156-157, 209-210, 

 269, 334-335, 402-403, 454, 507-508, 

 569-570) ; 12, 1904, 59-60, 138-139, 

 206-207, 275-276, 353-354, 417^18, 

 491-493, 563-564, 622-623, 676-677). 



Xew or variable star. Pop. Astr., 

 Xorthfield, Minn., 12, 1904, (624). 



Xew variable star 2. 1903 Draconis. 

 Pop. Astr., Xorthfield, Minn., 11, 1903, 



(215). 



Xew variable 11. 1903 Andiomedae. 

 Pop. Astr., Xorthfield, Minn., 11, 1903, 



(274). 



Xew variable 12. 19(i3 Gemiuonim. 

 Pop. Astr., Xorthfield, Minn., 11, 1903, 



(274). 



