Speckle interferometric measurements of binary stars. VI

McAlister, H. A.; Hendry, E. M.

doi:10.1086/190778

Cited by 217 publications

(22 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In spite of the numerous speckle observations since 1982 indicating the presence of a companion (McAlister & Hendry 1982;Bonneau et al 1984;etc. ), the duplicity is ignored in all the spectroscopic studies of its peculiarities.…”

Section: Classification and Duplicity Data For The Selected Sample Ofmentioning

confidence: 99%

Spectra of binaries classified asλBootis stars

Faraggiana

Gerbaldi

Bonifacio

et al. 2001

A&A

View full text Add to dashboard Cite

Abstract. High angular resolution observations have shown that some stars classified as λ Boo are binaries with low values of angular separation and magnitude difference of the components; therefore the observed spectrum of these objects is a combination of those two components. These composite spectra have been used to define spectroscopic criteria able to detect other binaries among stars classified as λ Boo. The application of this method to HD 111786 is presented: the contribution of 5 components to the observed spectrum is demonstrated by the shape of the O I 7774Å feature. This result makes unreliable any attempt to perform an abundance analysis of this object which therefore must be definitely rejected from the class of the peculiar λ Boo stars. This approach allowed us also to recognize that the SB2 star HD 153808 is in reality a triple system.

show abstract

Section: Classification and Duplicity Data For The Selected Sample Ofmentioning

confidence: 99%

Spectra of binaries classified asλBootis stars

Faraggiana

Gerbaldi

Bonifacio

et al. 2001

A&A

View full text Add to dashboard Cite

show abstract

“…A sub-aperture slit mask over the secondary was considered but was rejected because the telescope's dimensional uncertainties would have been too great. McAlister had also previously rejected sub-aperture slit mask calibration on this telescope for the same reason, relying instead, as we did, on calibration via observations of binaries with wellestablished orbits (McAlister & Hendry, 1982).…”

Section: System Description and Performancementioning

confidence: 94%

“…Within a few years, an intensified CCD (ICCD) camera controlled by an Osborne portable computer replaced the cumbersome and expensive film process (McAlister et al, 1982). Speckle interferometry not only allowed observations of binaries with angular separations below the seeing limit, but the observations were generally an order of magnitude more accurate than visual observations (McAlister, 1985).…”

Section: Introduction To Speckle Interferometrymentioning

confidence: 99%

Portable Speckle Interferometry Camera System

Genet

2013

J. Astron. Instrum.

View full text Add to dashboard Cite

Speckle interferometry of close double stars avoids seeing limitations through a series of diffraction-limited high speed observations made faster than the atmospheric coherence time scale. Electron multiplying CCD cameras have low read noise at high read speeds, making them ideal for speckle interferometry. A portable speckle camera system was developed based on relatively low cost, off-the-shelf components. The camera's modular components can be exchanged to adapt the system to a wide range of telescopes.

show abstract

“…The majority of these observations were collected in a separate catalogue, with the most recent data from December 1988 (Balega et al 1990). The speckle data given in the catalogue present only 7% of the world's speckle material compiled in the Second Catalogue of Interferometric Measurements of Binary Stars (McAlister & Hartkopf 1988). It should be noted that the 6-m telescope has been used mainly for study of compact pairs because they benefit most from the speckle interferometry with highest resolution.…”

Section: Statistics Of S P E C K L E O B S E R V a T I O N Smentioning

confidence: 99%

“…During the last 15 years more than 9,000 speckle interferometric measurements of binary stars have been collected using large optical telescopes (McAlister & Hartkopf 1988). Among them a significant contribution to the world speckle data has been made by the 6-m telscope near Zelenchuk.…”

Section: Introductionmentioning

confidence: 99%

Double and Multiple Star Speckle Observations at the 6-m Telescope

Балега¹,

Balega²,

Vasyuk³

et al. 1992

International Astronomical Union Colloquium

View full text Add to dashboard Cite

During the last 15 years more than 9,000 speckle interferometric measurements of binary stars have been collected using large optical telescopes (McAlister & Hartkopf 1988). Among them a significant contribution to the world speckle data has been made by the 6-m telscope near Zelenchuk. Up to now this instrument provides the maximal spatial resolution for single–aperture telescopes. First speckle images of the binary Capella were recorded at the telescope in 1977 (Balega & Tikhonov 1977), but we spent 5 more years to create special television techniques for photon counting and digital means for image processing before we started the regular interferometric program of binary observations in the wide range of stellar magnitudes. At first, the measurements were conducted in cooperation with French astronomers from the Centre d’Etudes et de Recherches Geodynamiques et Astronomiques using the optical camera and the television detector developed by Blazit et al. (1977). Since 1983 our equipment has been in use. The program of observations was oriented upon the traditional problems of multiple star speckle interferometry:1.Determination of stellar distances and masses for different types of binaries whose orbital elements can be derived. This includes already known fast visual and astrometric pairs with undetermined orbits, spectroscopic binaries that can be resolved directly, and newly discovered interferometric pairs which show fast orbital motion. The main attention was devoted to the late–type dwarfs in the vicinity of the Sun.2.Search for the secondary components whose existence could explain anomalies of stellar spectra or photometry (stars with composite spectra, occultation binaries, etc.)3.Study of unusual binaries (symbiotic stars, binaries with relativistic components, such as SS 433, etc.)

show abstract

Speckle interferometric measurements of binary stars. VI

Cited by 217 publications

References 0 publications

Spectra of binaries classified asλBootis stars

Spectra of binaries classified asλBootis stars

Portable Speckle Interferometry Camera System

Double and Multiple Star Speckle Observations at the 6-m Telescope

Contact Info

Product

Resources

About