Astrometric study of the relative motion of three stars with possible invisible companions based on homogeneous series obtained at Pulkovo with a 26-inch refractor

Details Astrometric study of the relative motion of three stars with possible invisible companions based on homogeneous series obtained at Pulkovo with a 26-inch refractor Astrometric study of the relative motion of three stars with possible invisible companions based on homogeneous series obtained at Pulkovo with a 26-inch refractor

Mar 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010astl...36..204k&link_type=abstract

Astronomy Letters, Volume 36, Issue 3, pp.204-219

Astronomy and Astrophysics

Astronomy

Visual Double Stars, Invisible Companions, Orbits, Masses, Parallaxes

Scientific paper

We investigate the relative motion of three stars, ADS 7446, 9346, and 9701, based on long-term observations with the Pulkovo 26-inch refractor. The relative motion of all three stars shows a perturbation that could be produced by the gravitational influence of an invisible companion. For ADS 7446, we have determined the orbit of the photocenter with a period of 7.9 yr; the mass of the companion is more than 0.4 M &sun;. For ADS 9346, we have determined the radial velocities of the components: -14.60 km s-1 for A and -13.94 km s-1 for B. For ADS 9346 and 9701, we have determined the dynamical parallaxes, 24 and 20 mas, respectively, which are larger than those in the Hipparcos catalog by 5 mas, and calculated the orbits by the apparent motion parameter (AMP) method. The new orbit of ADS 9346 is: a = 5″.2, P = 2035 yr, and e = 0.46 at the system’s mass M = 2.5 M &sun;. The new orbits of ADS 9701 are: ( a = 2″.9, P = 829 yr, e = 0.54, M = 4.3 M &sun;) and ( a = 3″.8, P = 1157 yr, e = 0.53, M = 5.0 M &sun;).

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