The triple system ADS 9167
Abstract
Based on correlation radial-velocity measurements, we found the primary component in the visual binary system ADS 9167 = HD 124640 to be a single-lined spectroscopic binary with a 2.87-yr period and 0.75 eccentricity. The visual components are of spectral type K2 V, while the secondary component of the spectroscopic pair is probably a red K6 V dwarf. Using the 26-year-long series of Pulkovo photographic relative-position observations, we compute a new visual orbit of AB with a period of about 1000 years by the method of apparent-motion parameters. The errors in its elements are estimated. The accuracy of the photographic measurements turns out to be not enough to construct an astrometric orbit of the 2.87-yr subsystem with a semimajor axis of ~ 0.024''. ADS 9167 shows a moderately high space velocity and a slightly reduced metallicity.
- Publication:
-
Astronomy Letters
- Pub Date:
- November 1998
- Bibcode:
- 1998AstL...24..753K