sequence lifetime. The measured ratio of deuterium to hydrogen in this star amounts to less than , which suggests this star may have formed in a region with an unusually low abundance of deuterium, or else the deuterium was consumed by some means. A possible scenario for the latter is that the deuterium was burned through while Alpha Pavonis was a pre-main-sequence star. The system is likely to be a member of the Tucana-Horologium association that share a common motion through space. The estimated age of this association is 45 million years. α Pavonis star has a peculiar velocity of relative to its neighbors. Companions Three stars have been listed as visual companions to α Pavonis: two ninth magnitude stars at about four arc minutes; and a 12th magnitude F5 main sequence star at about one arc minute. The two ninth magnitude companions are only 17 arc seconds from each other. α Pavonis A is a spectroscopic binary consisting of a pair of stars that orbit around each other with a period of 11.753 days. However, in part because the two stars have not been individually resolved, little is known about the companion except that it has a mass of at least . One attempt to model a composite spectrum estimated components with spectral types of B0.5 and B2, and a brightness difference between the two components of 1.3 magnitudes. References External links Peacock - Jim Kaler's Stars Pavonis, Alpha B-type subgiants 193924 100751 7790 Pavo (constellation) Spectroscopic binaries Peacock Durchmusterung objects