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

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

Dec 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005aj....130.2847t&link_type=abstract

The Astronomical Journal, Volume 130, Issue 6, pp. 2847-2851.

Astronomy and Astrophysics

Astronomy

5

Astrometry, Stars: Binaries: Visual, Stars: Individual (Wor 2)

Scientific paper

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 Msolar. 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 Msolar, 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.

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