The astrometric study of the triple system ADS 9173

Details The astrometric study of the triple system ADS 9173 The astrometric study of the triple system ADS 9173

Aug 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007iaus..240..131k&link_type=abstract

Binary Stars as Critical Tools and Tests in Contemporary Astrophysics, International Astronomical Union. Symposium no. 240, he

Astronomy and Astrophysics

Astrophysics

1

Scientific paper

An orbit of the wide visual double star ADS 9173 AB is derived firstly from the short arc of photographic observations by the apparent motion parameters (AMP) method. The orbital period is about 6000 years. We used Pulkovo 26-inch refractor photographic observations 1982-2004, parallax from Hipparcos and relative radial velocity from the article (Bakos, 1986). Our AMP-orbit is in agree with all observations since 1832 from WDS data base. The component B has a spectroscopic invisible satellite with a period 4.9 years (Bakos, 1986). We derived the astrometric orbit Bb from deviations relative to orbital motion of the wide pair A(Bb). It is in agree with radial velocity observations. According to mass-luminosity relation the mass of the component B is equal to 1.5 solar, the parallax from Hipparcos is equal to 0.021". Then the mass of the invisible component isn't less than 0.5 solar. The orientatons of the A(Bb) and Bb orbits indicate that they may be close to coplanarity.

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