HD 73882
HD 73882 is a visual binary system with the components separated by and a combined spectral class of O8. One of stars is an eclipsing binary system. The period of variability is listed as both 2.9199 days and 20.6 days, possibly due to the secondary being a spectroscopic binary star.
The system lies in the constellation of Vela about away from the Sun and is a member of the open cluster Ruprecht 64.
Components
The apparent magnitudes of the visible components A and B are 7.8 and 8.8 respectively. In 1996, analysis of the Hipparcos data showed that the system contained an eclipsing binary. It was given the variable star designation NX Velorum in 1999. The primary, A, is thought to be the eclipsing binary. It shows eclipses every, but there are thought to be both primary and secondary minima with the actual orbital period being. Additional radial velocity variations with a period of have also been found, suggesting that one of the components is a spectroscopic binary.The spectral types of the individual components are not known. The observed combined spectral type is variously given as O8.5V, O9III, or O8.5IV. The spectrum is presumed to be dominated by the primary pair which are more than a magnitude brighter than the secondary. The eclipsing components are likely to be two similar stars since the primary and secondary eclipses are almost identical. One source gives the combined mass of the eclipsing pair as and the mass of the secondary as, with an orbital period of about 643 years, but this is highly speculative with no reliable orbits available and even the number of components uncertain.