752 



TABLE 858.— MASSES OF STARS FOR BINARIES WITHIN 10 PARSECS 



FROM THE SUN * 



This table contains all visual binary stars within 10 parsecs for which the orbital ele- 

 ments and parallax are well determined. 



The sum of the masses follows from the harmonic relation : 



Mi + M 2 — -p 2 



where a is the semimajor axis of the relative orbit, expressed in astronomical units, P the 

 period in years ; the masses are referred to the sun's mass as unit. For the majority of these 

 binaries the mass-ratio is known, thus permitting a determination of the masses of the 

 individual component. 



Star Parallax 



77 Cas '.'184 



p Eri 161 



o 2 Eri B, C 202 



Sirius 381 



Procyon 287 



{ UMa 129 



a Cen A, B 756 



{ Boo 142 



f Her 102 



-8°4352 148 



Fu 46 155 



HR 6416 132 



HR 6426 147 



li Her B, C 109 



7° Oph 197 



61 Cyg 294 



Krii 60 256 



* Prepared by Peter van de Ramp, Swarthmore College. 



TABLE 859.— THE FIRST-MAGNITUDE STARS ARRANGED IN ORDER OF 



BRIGHTNESS* 



R A 19S0 Dec me Sp /i 8 



Name h m m 



Sirius t 6 42.9 — 16°39'— 1.6 A0 1'.'32 203° 



Canopus 6 22.8 —52 40 — .9 cF .02 47 



a Centauri 1 1 14 36.2 —60 38 .1 dG 3 3.68 281 



Vega § 18 35.2 +38 44 .1/4 .34 36 



Capella II 5 13.0 +45 57 .2 G 1 .44 168 



Arcturus 14 13 4 +19 27 .2 K0 2.28 209 



Rigeltil 5 12.1 —8 15 .3 cB 8 .00 ... 



Procyon t 7 36.7 +5 21 .5 dF 4 1.25 214 



Achernar 135.9 —57 29 .6 B7 .10 110 



/3 Centauri t II 14 00.3 —60 08 .9 B 3 .04 217 



Altair § 19 48.3 + 8 44 .9 A A .66 55 



Betelgeuse II § 5 52.4 + 7 24 .9 : M 2 .03 75 



Aldebarant 4 33.0 +16 25 .8 KS .20 160 



aCrucisttll 12 23.8 —62 49 1.1 B\ .04 235 



Spicall 13 22.6 —10 54 1.2 B2 .06 230 



Pollux § 7 42.3 +28 09 1.2 G 8 .62 265 



Antarest 16 26.3 —26 19 1.2 Ml .03 200 



Fomalhaut 22 54.9 -29 53 1.3 A3 .37 116 



Deneb § 20 39.7 +45 06 1.3 cA 2 .CO . . . 



Regulustt 10 05.7 +12 13 1.3 5 8 .25 270 



j8 Crucis II 12 44.8 —59 25 1.5 B 1 .05 235 



v 



km/s 



- 8 

 +20 

 —22 



— 14 



+30 



- 5 

 +24 



— 4 

 + 19 



'.'378 

 .012 

 .755" 

 .122 

 .073 

 .091 

 .002: 

 .294 

 .032 

 ■12: .036: 

 -26 .206 



+21 

 + 54 



— 8: 

 + 2: 

 + 3 



— 3 

 + 6 



— 5: 



.013 

 .058 

 .03: 

 .011 

 .100 

 .020 

 .145 

 .002 



+ 3: .042 

 +20 .006 



Af.bs 



+ 1.3 

 -5.5 

 +4.5 

 + -5 



— .5 

 .0 



—8.: 



+2.8 



—1.9 



-1.3: 



+2.5 



-3.5 



— .4 

 -1.5 

 -2.6: 

 + 1.2 

 —2.3: 

 +2.1 

 -7.: 



— .6 

 -4.4: 



* Prepared by W. Luyten, University of Minnesota. t Visual binary. % Has distant companion. 



§ Has an optical companion. The magnitude shown is the combined visual magnitude. || Spectroscopic 



binary, m = magnitude, Sp = spectrum, /i = proper motion, 8 = position angle, V = radial velocity, p = parallax, 

 M = absolute magnitude. 



SMITHSONIAN PHYSICAL TABLES 



