科研之友
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摘要
In continuation of our previous study we present an updated census of new companions and model atmosphere analyses for some 50 southern dwarfs, mostly in the mass range 0.90 <= M <= 1.10 M-circle dot. For the common-propermotion companions mu Vir B, HR 2225 B, HD 67199 B, and HD 114853 B, we confirm their physical association from their radial velocities. We report the discovery of the F-type visual binary alpha For as a field blue straggler and confirm (zeta Ret, HR 5864) or identify (HD 67199, HR 4013, HR 8843) another five mass transfer systems or candidates. For the F stars tau(1) Eri and 111 Tau, we present 10 sigma and 7 sigma cases for astrometric binaries by virtue of the very accurate van Leeuwen Hipparcos parallaxes. Following the work of Shaya & Olling, we suggest the F-type star i Vir to be a wide (0.37 pc) hierarchical quadruple system. We confirm the visual binary NLTT 23781/2 as a common-proper-motion object to the very wide (0.54 pc) F star 40 Leo, but discard the G star HD 128987 as an ultra-wide (1.01 pc) physical companion to the alpha Lib quadruple system on account of a diverse metallicity. The improved statistics of our sample establishes the previously discovered positive correlation of stellar multiplicities with primary mass. For the F star multiplicity census in the mass range 1.10 <= M <= 1.70 M-circle dot, we find that at least a quarter consists of triple or higher level systems and at least two out of three F stars are non-single.
- 出版日期2015-8-10
