Speckle Interferometry of Nearby Multiple Stars. IV. Measurements in 2004 and New Orbits

Details Speckle Interferometry of Nearby Multiple Stars. IV. Measurements in 2004 and New Orbits Speckle Interferometry of Nearby Multiple Stars. IV. Measurements in 2004 and New Orbits

2007-12-17

arxiv.org/abs/0712.2573v1

Astrophys.Bull.62:339-351,2007

Astronomy and Astrophysics

Astrophysics

11 pages, 2 figures, accepted to Astrophysical Bulletin

Scientific paper

10.1134/S1990341307040050

The results of speckle interferometric observations of 104 binary and 6 triple stars performed at the BTA 6 m telescope in 2004 October are presented. Nearby low-mass stars are mostly observed for the program, among which 59 there are new binaries recently discovered by the Hipparcos astrometric satellite. Concurrently with the diffraction-limited position measurements we obtained 154 brightness ratio measurements of binary and multiple star components in different bands of the visible spectrum. New, first-resolved binaries are the symbiotic star CH Cyg with a weak companion at 0.043'' separation and the pair of red dwarfs, GJ 913 = HIP 118212. In addition, we derived the orbital parameters for two interferometric systems: the CN-giant pair HD 210211 = HIP 109281 (P=10.7 yr) and the G2V-K2V binary GJ 9830 = HIP 116259 (P=15.7 yr).

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