630 Table 81 6 



PERIODS OF KNOWN BINARY STARS WITHIN 10 PARSECS OF THE SUN 



There is no reliable evidence (1930) for favored orientation of planes of double-star orbits. Kepler 

 3rd law gives (p, period in yrs.) 2 = (a, major axis, astr. units^/CM, in solar masses). There is an apparei 

 statistical relation between eccentricity and period, viz.: 



Eccentricity 3.0 3.5 4.0 4.5 5.0 5.5 6.0 



Period (logs) 62 .66 .71 .76 .80 .83 .85 



Using the mass-luminosity law (see p. 631) Luyten obtains: Log period in yrs. = 1.460 log d — 0.48 

 log (AI, in solar air-masses) + 0.168 ±0.35 where d is observed distance between stars at right angl< 

 to line of sight in astronomical units. 



From the data of the following groups the median-mean log of the periods (median-geometrical mea 

 of actual periods) is probably about 2.5 (a little more than 300 yrs.). Half of the binaries in space ma 

 be expected to have periods between the limits of 20 and 4000 yrs. 



733 



f Her (22084).. 



aCMi 



Mlb4 AB 



M Her BC 



Krii 60 AB 



aCMaAB 



£UMaAB-CD. 



0.72 

 1.2 



3± 

 1.26 



•74 

 1.36 

 10.6 

 1.61 



Paral- 

 lax 



O.I OO 

 .112 



•307 

 .140 

 .107 



.258 

 .366 

 •145 



Mass 

 sun 



I.O 

 2.1 



1.6 

 I.I 



.90 



•45 

 3-4 

 1.4 



Log 

 period 



1-43 

 1-54 

 1.60 

 1.62 

 1.63 

 1.65 

 1.70 

 1.78 



Period 



years 



26.7 



34-5 

 40.2 

 42.2 

 43-0 



44-3 

 50.0 



59-9 



Star 



aCen AB. 

 70 Oph . . . 

 Brsb 13 . . 

 £ Boo .... 

 A 5 (p Eri) 

 o 2 Eri Be. . 

 7? Cas. . . . 



Spectroscopic 

 binaries 



5 Tri 



£ UMa CD 



X Drac 



P- -1-57 

 -1.56 

 — 0.11 



p: 0.0272 

 .027 ± 

 .769 



77 Boo 



f UMa AB 



logp: +0.13 

 0.26 



Star 



Lac 353 CD 



Brs 5 (P342Y?) 



Sh 243 AB 



Millb 377 



K Tuc AB (113423) . . . . 



h 5173 



Hu 1128 



O2547AB 



22398 



2 1280 



61 Cyg (2 2758) 



Sh 190 



02 539 AC 



2 1321 



Bo 187 



Mlb4AB-C 



M Her A-BC 



2 EriA-BC 



7 Lep(HV 5 o) 



Chri 2448 



Lpz II 961 



K Tuc-Lac 353 AB-CD 



f Ret 



O2547AB-C 



36 Oph-^o Sco AB-C . . 



W-Ott 581 1 



a Cen AB-C 



d 



Astro- 

 nomical 

 units 



II ± 



15-7 

 24.8 

 20 

 46 ± 



37 



48 



48 



54-4 



52 



70 



78.8 



87 

 119 



139 



215 



305 



4^5 



639 



670 

 1060 

 2875 ± 

 3100 =fc 



33oo 

 4200 

 3210 



8860 



Abs. magnitudes 



7-8, 

 8.0, 



6.5, 

 10, 



5-2, 

 7-2, 

 5-6, 

 9-3. 

 1 1.1, 



8.7, 

 8.0, 



7-i, 



7-3- 



9-1. 



10.4, 



11. 1, 



3-7. 



6.0, 



4-7, 

 8.8, 

 6.6, 

 5-2, 

 5-2, 

 9-3. 

 6.5, 

 10.2, 



15-5. 



8.0. 



6.5. 

 13... 



74- 

 13.2. 

 14.. 



9.4. 

 11. 7. 



9.1. 



8.7. 

 10.2 . 



9-7- 



9.1. 

 13.0. 

 -f- mass 1 

 + mass o 

 + mass o 



7-3 



5. . . . 

 2. . . . 

 4, 7.8, 8.8 



5 



4, 10.2 



5.7-8. 



4 



+ mass 2.04 



Mass 

 sun 

 = 1 



1.03 



1. 00 



1.36 



•51 



1.50 



.78 



•99 



■77 



•55 



.86 



•95 

 •94 

 •95 

 .84 



•5i 

 1.40 

 2.20 

 1.38 

 1.58 



.76 



•9i 

 2-53 

 1.8 

 1.1 1 

 1.89 



•56 

 2.20 



Luyten, W. J. (Harvard College Obs., Proc. Nat. Acad. Sci., 10, 252, 257, 1930. 



Smithsonian Tables 



