The Ninth Catalogue of Spectroscopic Binary Orbits (http://sb9.astro.ulb.ac.be) continues the series compilations spectroscopic orbits carried out over past 35 years by Batten and collaborators. As 2004 May 1st, new holds for 2386 systems. Some essential differences between this catalogue its predecessors are outlined three straightforward applications presented: (1) completeness assessment: period distribution SB1s SB2s; (2) shortest periods across H-R diagram; (3) period-eccentricity relation.

We have surveyed a sample of 165 solar-type spectroscopic binaries (SB) with periods from 1 to 30 days for higher-order multiplicity. A subsample 62 targets were observed the NACO adaptive optics system and 13 new physical tertiary companions detected. An additional 12 wide (5 still tentative) found using 2MASS all-sky survey. The belong 161 stellar systems; these 64 are triple, 11 quadruple 7 quintuple. After correction incompleteness, fraction SBs is be 63% ± 5%. find that this strong...

We consider the multiplicity of stellar systems with (combined) magnitude brighter than 6.00 in Hipparcos magnitudes. identify 4559 such bright (including Sun), and frequencies multiplicities 1, 2, …, 7 are found to be 2718, 1437, 285, 86, 20, 11 2. discuss uncertainties, which substantial. also distributions periods orbits suborbits. note that for even more restricted set 478 VH≤ 4.00, proportions higher multiples up sextuple progressively larger (213, 179, 54, 19, 8, 5), suggesting...

The results of speckle interferometric measurements binary and multiple stars conducted in 2008 2009 at the Blanco SOAR 4-m telescopes Chile are presented. A total 1898 1189 resolved pairs or sub-systems 394 observations 285 un-resolved targets listed. We for first time 48 new pairs, 21 which close visual stars. Typical internal measurement precision is 0.3 mas both coordinates, typical companion detection capability $\Delta m \sim 4.2$ 0\farcs15 separation. These data were obtained with a...

Statistics of hierarchical multiplicity among solar-type dwarfs are studied using the distance-limited sample 4847 targets presented in accompanying Paper I. Known facts about binaries (multiplicity fraction 0.46, log-normal period distribution with median 100yr and logarithmic dispersion 2.4, nearly uniform mass-ratio independent period) confirmed a high statistical significance. The hierarchies three or more components is 0.13+-0.01, fractions n=1,2,3,... 54:33:8:4:1. Sub-systems secondary...

The CHIRON optical high-resolution echelle spectrometer was commissioned at the 1.5 m telescope CTIO in 2011. instrument designed for high throughput and stability, with goal of monitoring radial velocities bright stars precision cadence discovery low-mass exoplanets. Spectral resolution R = 79 000 is attained when using a slicer total (including detector) efficiency 6% or higher, while 136 available stars. A fixed spectral range 415–880 nm covered. grating housed vacuum enclosure...

We report on the results of speckle observations at 4.1 m SOAR telescope in 2010 and 2011. A total 639 objects were observed. give 562 measurements 418 resolved binaries, including 21 pairs for first time, upper detection limits 221 unresolved stars. New orbital elements have been determined 42 physical pairs, which 22 are first-time calculations; rest corrections, sometimes substantial. Linear calculated nine apparently optical doubles. comment new solutions, other remarkable objects.

We conducted a survey of nearby binary systems composed main sequence stars spectral types F and G in order to improve our understanding the hierarchical nature multiple star systems. Using Robo-AO, first robotic adaptive optics instrument, we collected high angular resolution images with deep well-defined detection limits Sloan Digital Sky Survey i' band. A total 695 components belonging 595 were observed. prioritized observations faint secondary separations over 10'' quantify still poorly...

We report the results of speckle runs at 4.1-m Southern Astronomical Research (SOAR) telescope in 2012 and 2013. A total 586 objects were observed. give 699 measurements 487 resolved binaries upper detection limits for 112 unresolved stars. Eleven pairs (including one triple) first time. Orbital elements have been determined time 13 pairs; orbits another 45 are revised or updated.

A catalog of common-proper-motion (CPM) companions to stars within 67 pc the Sun is constructed based on SUPERBLINK proper-motion survey. It contains 1392 CPM pairs with angular separations 30'' < ρ 1800'', relative proper motion between two components less than 25 mas yr−1, and magnitudes colors secondaries consistent those dwarfs in (MV, V − J) diagram. In addition, we list 21 candidate white dwarf under 300'', about half which should be physical. We estimate a 0.31 fraction red physical...

Results of speckle observations at the 4.1 m SOAR telescope in 2012 (158 measures 121 systems, 27 non-resolutions) are reported. The aim is to follow fast orbital motion recently discovered or neglected close binaries and sub-systems. Here, eight previously known orbits defined better, two more completely revised, five computed for first time. Using differential photometry from Hipparcos standard relation between mass absolute magnitude, component's masses dynamical parallaxes estimated all...

ABSTRACT High-resolution spectra of visual multiple stars were taken in 2008–2009 to detect or confirm spectroscopic subsystems and determine their orbits. Radial velocities 93 late-type belonging systems measured by numerical cross-correlation. We provide the individual velocities, width, amplitude Gaussians that approximate correlations. The new information on resulting from these data is discussed. discovered double-lined binaries HD 41742B, 56593C, 122613AB, confirmed several other known...

Zeta Aquarii is a bright and nearby (28 pc) triple star with 26-year astrometric subsystem. Almost half of the outer 540-year visual orbit has been covered in 238 years its observations. Both inner orbits are revised here taking into account recent direct resolution pair Aa,Ab. The high eccentricity 0.87 inclined to by 140+-10 degrees, suggesting that Kozai-Lidov cycles take place. masses stars Aa, B, Ab 1.4, 0.6 solar. age system about 3 Gyr, two main components have just left sequence....

Twenty multiple stellar systems with solar-type primaries were observed at high angular resolution using the PALM-3000 adaptive optics system 5 m Hale telescope. The goal was to complement knowledge of hierarchical multiplicity in solar neighborhood by confirming recent discoveries visible Robo-AO new near-infrared observations PALM-3000. physical status most, but not all, pairs is confirmed photometry Ks band and positional measurements. In addition, we resolved for first time five close...

TESS is finding transiting planet candidates around bright, nearby stars across the entire sky. The large field-of-view, however, results in low spatial resolution, therefore multiple contribute to almost every light curve. High-angular resolution imaging can detect previously unknown companions planetary candidate hosts that dilute transit depths, lead host star ambiguity, and some cases are source of false-positive signals. We use speckle on SOAR search for 542 Southern provide correction...

A sample of 115 B-type stars in the Sco OB2 association is examined for existence visual companions J and Ks bands, using ADONIS near-infrared adaptive optics system coronograph. Practically all components separation range – (45–900 AU) magnitudes down to were detected. The K photometry primaries differential astrometry 96 secondaries are presented. Ten new physical components, as inferred from photometric statistical criteria, while rest newly detected objects faint background stars. After...

The MSC catalogue contains data on 612 physical multiple stars of multiplicity 3 to 7 which are hierarchical with few exceptions. Orbital periods, angular separations and mass ratios estimated for each sub-system. elements given when available. can be accessed through CDS (Strasbourg). Half the systems within 100 pc from Sun. comparison periods close wide sub-systems reveals that there is no preferred period ratio all possible combinations found. distribution logarithms short bimodal,...

Analytical theory is combined with extensive numerical simulations to compare different flavours of centroiding algorithms: thresholding, weighted centroid, correlation, quad cell (QC). For each method, optimal parameters are defined in function photon flux, readout noise and turbulence level. We find that at very low flux the QC centroid leads best result, but latter method can provide linear response if weight follows spot displacements. Both methods work average as 10 photons per...

The theory of the differential image motion monitor (DIMM), a standard and widely spread method measuring astronomical seeing, is reviewed extended. More accurate coefficients for computing Fried parameter from measured variance are given. They tested by numerical simulations that show any DIMM measures Zernike tilts, not centroids as generally assumed. contribution CCD readout noise to modeled. It can substantially bias results if left unsubtracted. second most important comes used exposure...

Since 2007, close binary and multiple stars are observed by speckle interferometry at the 4.1 m Southern Astrophysical Research (SOAR) telescope. The HRCam instrument, observing strategy planning, data processing calibration methods, developed improved during ten years, presented here in a concise way. Thousands of were measured with diffraction-limited resolution (29mas 540nm wavelength) high accuracy reaching 1mas; two hundred new pairs or subsystems discovered. To date, has performed over...

Abstract The catalog of hierarchical stellar systems with three or more components is an update the original 1997 version. For 2000 hierarchies, new Multiple Star Catalog (MSC) provides distances, component masses and periods, supplementary information (astrometry, photometry, identifiers, orbits, notes). MSC content format are explained, its incompleteness strong observational selection stressed. Nevertheless, can be used for statistical studies a valuable source planning observations...

Data on the multiplicity of F- and G-type dwarf stars within 67 pc Sun are presented. This distance-limited sample based Hipparcos catalog contains 4847 primary (targets) with 0.5 < V − IC 0.8 is >90% complete. There 2196 known stellar pairs; some them belong to 361 hierarchical systems from triples quintuples. Models companion detection by radial velocity, astrometric acceleration, direct resolution, common proper motion developed. They serve compute completeness for each target, using...

Joint statistics of periods and mass ratios close binaries its dependence on primary can be explained by assuming that seed binary companions are formed disc fragmentation at random intervals during assemblage stellar migrate inwards as they accrete from the circumbinary disk. A toy model based simple prescriptions for companion growth migration reproduces such aspects solar-mass distribution P, brown dwarf desert short nearly uniform ratios, a population equal-mass (twins) decreases...

A sample of 477 solar-type binaries within 67 pc with projected separations larger than 50 au is studied by a new statistical method. Speed and direction the relative motion are determined from short observed arcs or known orbits, their joint distribution compared to numerical simulations. By inverting help simulations, we find that average eccentricity wide 0.59 ± 0.02 can be modelled as f(e) ≈ 1.2e + 0.4. However, containing inner subsystems, i.e. triple higher order multiples, have...