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Orbit, Dynamical Mass, and MK Type of Visual Binary WOR 2

On the basis of new speckle measurements with the 6 m telescope of the Special Astrophysical Observatory (Russia) and Hipparcos astrometry, an improved orbital solution with a period of P = 24.1 yr for the visual binary WOR 2 is obtained. The dynamical mass of the system is 1.40 ± 0.25 M⊙. Differential photometry (Δm = 0.55 mag) allowed us to estimate the luminosity of individual components (M = +8.0 and +8.6 mag), which in turn led to individual masses of 0.65 and 0.61 M⊙, in good agreement with the systemic mass. The slit spectra obtained with the 2.6 m telescope of the Byurakan Astrophysical Observatory (Armenia) show that in the combined light WOR 2 is a K6 dwarf, whereas individually the components according to their luminosities are likely to be K6–K7 and M0 dwarfs. The equivalent width of the Hα absorption line (0.9 Å) is concordant with previous data, indicating the overall stability of this system.