This plot shows the radial velocities of the primary and secondary of the star system HR6469. This system is a triple star system, where the third star is a subcomponent of the secondary. The third star makes itself known by means of a reflex velocity in the secondary (the parent of the third star). The plot shows the velocity of the primary (circles) and the secondary (pluses) with the reflex velocity removed. The solution was obtained with the Binary program where speckle and spectroscopic data were simultaneously considered. The data were originally published by Scarfe, Barlow, Fekel, Rees, Lyons, Bolton, McAlister, and Hartkopf in the A. J., 107, 1529 (1994).
An example of the output (not the ultimate solution) is:
Period= 5.522380371 +-0.2420677E-02 Time of periastron passage= 1986.371952 +-0.3332232E-02 Eccentricity= 0.6818927499 +-0.2190056E-02 Angle of line of nodes= 321.5173704 +-0.3737605 Inclination= 55.93759981 +-0.4013246 Angle from node to periastron= 222.8899259 +-0.3586578 Semimajor axis in "= 0.4394817537E-01 +-0.3488334E-03 Ratio of semimajor axes (total to primary)= 1.711966236 +-0.8147726E-02 Parallax= 0.1487551549E-01 +-0.9626023E-04 System radial velocity= -3.605720706 +-0.6221023E-01 Period of secondary subcomponent #1= 0.6104538879E-02 +-0.1887525E-08 Time of periastron passage of sec. subcomp. #1= 1984.378108 +-0.1306341E-05 Eccentricity of sec. subcomp. #1= 0.1000000000E-01 +-0.0000000E+00 Periastron angle of sec. subcomp. #1= 0.0000000000E+00 +-0.0000000E+00 Sine(incl.) times a(AU) of sec. subcomp. #1= 0.1915211945E-01 +-0.2240687E-04 The semimajor axis in " is assigned to the primary orbit The projected velocity amplitude of the primary is 18.047710 km/sec The projected velocity amplitude of the secondary is 12.849360 km/sec The projected velocity amplitude of sec. subcomp. #1 is 93.453683 km/secNotice that the mean errors for the eccentricity and periastron angle of the secondary subcomponent are zero. This is because these two parameters were held constant in the solution.