This page shows a graph of computed longitudes of periastron based on a truncated version of J. Miller Barr's (1908) table of spectroscopic binaries(1). Eight Cepheid variables (which are currently considered to be pulsators) and three binaries for which the eccentricity and average orbit speed were not available, have been removed from the table.

The radial lines represent the values of ω, i.e., the computed longitude of
periastron, for nineteen spectroscopic binaries.   See accompanying table.

                               ======================================================================================                                     
                                     STAR              P         e       ω         K           Reference 
                               -------------------------------------------------------------------------------------- 
                                                       d               Degrees    km. 
                               [#] β Arietis         107.0      0.88     19.7    32.6   Astroph. Jour., 25, 320, 1907
                                   Capella           104.022    0.016   117.3    25.76     "      "     14, 263, 1901
                                   η Orionis           7.9896   0.016   42 16'  144.75     "      "     17,  68, 1903
                                   δ Orionis           5.7325   0.103   33 19   100.85     "      "     19, 268, 1904
                                   ζ Tauri           138.       0.180    9 45    14.95     "      "     22, 115, 1905
                                   α2 Geminorum        9.2188   0.503   265.35   13.56     "      "     23, 351, 1906
                                   κ Cancri            6.393    0.149   162 16   67.8      "      "     25, 315, 1907
                                   V Carinae           6.744    0.18    115.84   21.5      "      "     26, 268, 1907
                                   κ Velorum         116.65     0.19     96.23   46.5      "      "     26, 271, 1907
                                   η Virginis         71.9      0.254   180  0   26.8      "      "     26, 282, 1907
                               [#] Mizar              20.6      0.502   101.3   142.       "      "     13, 324, 1901
                                   α Draconis         51.38     0.43     19.     48. ±  Jour. R.A.S.C.,  1, 237, 1907
                                   μ Sagittarii      180.2      0.441    74 43   64.5   Astroph. Jour., 26, 157, 1907
                               [#] χ Draconis        281.8      0.423   119.0    18.15     "      "     11, 131, 1900
                                   β Lyrae            12.908    0.07     83.4   181.05     "      "      6, 328, 1897
                                   η Aquilae           7.176    0.489    68.91   20.59     "      "      9,  59, 1899
                               [#] θ Aquilae          17.17     0.725    20.     52. ±  Jour. R.A.S.C.,  1, 357, 1907
                                   η Pegasi          818.0      0.155    5.61    14.20  Astroph. Jour., 14, 202, 1901
                                   λ Andromedae       20.546    0.086  301.0      7.07      "     "     24, 345, 1906

                                        [The next to last reference had a typo.  The page number was given as 20.]

(2) Pourbaix, D., Resolved double-lined spectrographic binaries: A neglected source of hypothesis-free parallaxes and stellar masses, Astronomy & Astrophysics Supplement Series, 145, 215 (2000) - NADS