41. HR 4729 is itself a close spectroscopic binary system with a period of 1 day 5 hours. 42. Both members of the spectroscopic binary ? Vel A are evolved stars that have left the main sequence. 43. This, in turn, has made determination the orbital period of A's spectroscopic binary difficult. 44. This is a spectroscopic binary with an angular separation of 0.2 arcseconds between the two components. 45. RT Aurigae has been suspected to be a spectroscopic binary system, but this has not been confirmed. 46. This is a single-lined spectroscopic binary system, but the secondary has been detected using interferometry. 47. The star is a low-amplitude spectroscopic binary , with the secondary being a brown dwarf candidate. 48. The primary star is a spectroscopic binary with period 30.4 days and eccentricity 0.63. 49. "' WR 9 "'is a spectroscopic binary in the constellation class O star. 50. Such a system is known as a double-lined spectroscopic binary ( often denoted " SB2 " ).
