Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...252..123a&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 252, no. 1, Dec. 1991, p. 123-126.
Astronomy and Astrophysics
Astronomy
11
Stellar Evolution, Stellar Systems, Triple Stars, Binary Stars, Companion Stars, Dynamic Models, Local Group (Astronomy), Stellar Models, Stellar Dynamics: Numerical Simulations, Three-Body Problem, Triple Stars
Scientific paper
The physical connection, the dynamical status, and the probable dynamical evolution have been studied for the following nearby visual triple stars: ADS 48, α Gem (Castor), α Cen, and ξ Sco. The uncertainties of observations have been taken into account. All four systems are probably physical, and they have negative total energies. The inner pairs have elliptical orbits. In the close triple system ADS 9909, the distant component C moves probably on an elliptical orbit around the close pair AB. This system is unstable with a probability 95 %. In three other wide systems, the probability for a slow hyperbolic passage of a distant component past a close pair AB is larger than the probability for the system to be connected, stable or unstable. We propose the hypothesis that these systems are parts of stellar moving groups. We list the probable members of these groups in the nearby stars from the Gliese's Catalogue (1969). The system ADS 48 is member of the Hyades group. The system ADS 9909 has 13 companions, its velocity is close to that of the Hyades-Praesepe flow. The system ADS 6175 has 9 companions, among which there are three binary stars and one wide pair (α PsA + DM -32°17321). The system α Cen + Proxima has two companions: one binary star (Gliese 140.1) and one triple star (ADS 10288 = Gliese 649.1).
Anosova Joanna P.
Orlov Valeri
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