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The previously known, 6-yr spectroscopic binary HR 6046 has been speculatedin the past to contain a compact object as the secondary. A recent study hasre-determined the orbit with great accuracy, and shown that the companion is anevolved but otherwise normal star of nearly identical mass as the primary,which is also a giant. The binary motion was detected by the Hipparcos missionbut was not properly accounted for in the published astrometric solution. Herewe use the Hipparcos intermediate data in combination with the spectroscopicresults to revise that solution and establish the orbital inclination angle forthe first time, and with it the absolute masses M(A) = 1.38 [-0.03,+0.09]M(Sun) and M(B) = 1.36 [-0.02,+0.07] M(Sun). Aided by other constraints, weinvestigate the evolutionary status and confirm that the primary star isapproaching the tip of the red-giant branch, while the secondary is beginningits first ascent.

HIPPARCOS Astrometric Orbit and Evolutionary Status of HR 6046