منابع مشابه
Spectroscopic binaries with elliptical orbits
The radial velocity curves of many spectroscopic binaries (SBs) are perturbed by gas streams or proximity effects. For SBs with circular orbits, these perturbations can give rise to spurious orbital eccentricities of high statistical significance. But tests to identify such anomalous orbits can be constructed since perturbed velocity curves are in general no longer Keplerian. The derived tests ...
متن کاملSpectroscopic Subsystems in Nearby Wide Binaries
Radial velocity (RV) monitoring of solar-type visual binaries has been conducted at the CTIO/SMARTS 1.5-m telescope to study short-period systems. Data reduction is described, mean and individual RVs of 163 observed objects are given. New spectroscopic binaries are discovered or suspected in 17 objects, for some of them orbital periods could be determined. Subsystems are efficiently detected ev...
متن کاملTertiary companions to close spectroscopic binaries
Preliminary results of a survey of nearby solar-type spectroscopic binaries (SB) with 1 < P1 < 30 days for tertiary companions are presented. Observations with adaptive optics and data from the 2MASS sky survey permitted to discover new tertiary components and to sharpen statistical limits on their frequency. We find that 0.86 ± 0.07 SBs with P1 < 5 d have tertiaries, but this fraction drops to...
متن کاملSpectroscopic binaries with components of similar mass
The assertion that there is an intrinsic excess of binaries with mass ratios q ≃ 1-the twin hypothesis-is investigated. A strong version of this hypothesis (Hs), due to Lucy & Ricco (1979) and Tokovinin (2000), refers to a narrow peak in the distribution function ψ(q) for q > ∼ 0.95. A weak version (Hw), due to Halbwachs et al. (2003), refers to a broad peak for q > ∼ 0.8. Current data on SB2's...
متن کاملSpectroscopic binaries among Hipparcos M giants ⋆ II . Binary frequency
Context. This paper is the second one in a series devoted to the study of properties of binaries involving M giants. Aims. The binary frequency of field M giants is derived and compared with the binary fraction of K giants. Methods. Diagrams of the CORAVEL spectroscopic parameter Sb (measuring the average line-width) vs. radial-velocity standard deviation for our samples are used to define appr...
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ژورنال
عنوان ژورنال: Astronomy & Astrophysics
سال: 2012
ISSN: 0004-6361,1432-0746
DOI: 10.1051/0004-6361/201117703