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 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 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 کاملIR Detection of Low-Mass Secondaries in Spectroscopic Binaries
This paper outlines an infrared spectroscopic technique to measure the radial velocities of faint secondaries in known single-lined binaries. The paper presents our H band observations with the CSHELL and the Phoenix spectrographs and describes detections of three low-mass secondaries in main-sequence binaries: G147-36, G 164-67, and HD 144284, with mass ratios of 0.562± 0.011, 0.423 ± 0.042, a...
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ژورنال
عنوان ژورنال: International Astronomical Union Colloquium
سال: 1977
ISSN: 0252-9211
DOI: 10.1017/s0252921100052982