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V539 Arae
V539 Arae (Bayer designation Nu Arae (ν Arae / ν Ara)) is a triple star system in the southern constellation of Ara. Based upon an annual parallax shift of ,〔 this system is at a distance of roughly from Earth.
The core members of this system, ν Ara AB, consist of a pair of B-type main sequence stars in a close orbit with a period of 3.169 days and an eccentricity of 0.06. Their respective stellar classifications are B2 V and B3 V, and they have a combined visual magnitude of 5.65. Because the orbital plane lies close to the line of sight from the Earth, this pair form a detached eclipsing binary of the Algol type.〔 The eclipse of the primary causes a decrease of 0.52 in magnitude, while the secondary eclipse decreases the magnitude by 0.43.〔 At an angular separation of 12.34 arcseconds, is the tertiary component of this system; a magnitude 9.40 A-type main sequence star with a classification of A1 V.〔
The system is sometimes referred as Upsilon Arae (υ Arae), and more generally unlettered.〔(Note for HR 6622 ): Hoffleit, D., Warren, Jr., W. H., (1991). ''The Bright Star Catalogue'', (5th Revised Ed).〕
==References==
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