Speckle interferometry of nearby multiple stars. IV. Measurements in 2004 and new orbits
Abstract
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 G2V-K2V binary GJ 9830 = HIP 116259 (P = 15.7 yr).
- Publication:
-
Astrophysical Bulletin
- Pub Date:
- December 2007
- DOI:
- 10.1134/S1990341307040050
- arXiv:
- arXiv:0712.2573
- Bibcode:
- 2007AstBu..62..339B
- Keywords:
-
- 97.80.Kq;
- Astrophysics
- E-Print:
- 11 pages, 2 figures, accepted to Astrophysical Bulletin