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541. Speckle interferometry at the OAN-SPM Mexico
ID:
ivo://CDS.VizieR/J/AJ/161/253
Title:
Speckle interferometry at the OAN-SPM Mexico
Short Name:
J/AJ/161/253
Date:
09 Mar 2022
Publisher:
CDS
Description:
In this paper we present multiband speckle interferometric measurements of double stars performed at the 2.1m telescope of the Observatorio Astronomico Nacional, San Pedro Martir, Mexico. We focused our efforts on objects from the Washington Double Star Catalog that were observed during five runs allocated in 2018 and 2019. We report here 2101 astrometric and 2027 photometric measurements of 631 pairs, with angular separations ranging from 0.05" to 6.09", including 1622 measurements with separations smaller than 1", and a magnitude difference up to 5.99mag through the V filter, 5.46mag for the R filter, and 5.85mag for the I filter. We estimated a mean error in separation of 12mas, 1.1{deg} in position angle, and 0.14mag for the magnitude difference. We confirmed 58 double stars discovered by Hipparcos. For the first time we are presenting astrometric measurements for 7 systems listed at the Washington Double Star Catalog as being suspected binaries, which did not have a secondary confirmation, and 15 stars with only one published measurement. We identified a new close companion with a mean angular separation of 0.10", detected in a previously known pair. Finally, we present a correction to two previously published orbital solutions of two visual binaries.
542. Speckle interferometry at the USNO. XXIV.
ID:
ivo://CDS.VizieR/J/AJ/162/53
Title:
Speckle interferometry at the USNO. XXIV.
Short Name:
J/AJ/162/53
Date:
15 Mar 2022 08:28:18
Publisher:
CDS
Description:
The results of 3611 intensified CCD observations of double stars, made with the 26inch refractor of the U.S. Naval Observatory, are presented. Each observation of a system represents a combination of over 2000 short-exposure images. These observations are averaged into 1857 mean relative positions and range in separation from 0.341" to 128.644", with a median separation of 6.533". Two systems have their orbits improved and one has its first determination. This is the 24th in this series of papers and covers the period 2018 May 24 through 2019 October 28.
543. Speckle interferometry of Ap stars
ID:
ivo://CDS.VizieR/J/other/AstBu/67.44
Title:
Speckle interferometry of Ap stars
Short Name:
J/other/AstBu/67
Date:
21 Oct 2021
Publisher:
CDS
Description:
We present the results of speckle interferometry of a sample of 117 chemically peculiar stars with global magnetic fields. The observations were made in December 2009 at the BTA with a spatial resolution of about 0.02 arcseconds in the visual spectral region. Twenty-nine stars were resolved into individual components, 14 of them for the first time (HD965, HD5797, HD8855, HD10783, HD16605, HD21699, HD35502, HD51418, HD64486, HD79158, HD103498, HD108651, HD213918, HD293764). In twelve cases a companion turned out to be 2-4 magnitudes fainter than the main component - a magnetic star. Young hot Bp stars HD35502 and HD213918 are exceptions, since their companions are fainter by about 1 magnitude. In all cases, the linear distance from a star to its companion at the epoch of observations in the picture plane exceeded 10^9^km. Eighty-eight magnetic CP stars revealed no secondary components within our study. Thus, the fraction of speckle interferometric binaries in our sample amounts to 25%.
544. Speckle interferometry of Ap stars. II.
ID:
ivo://CDS.VizieR/J/other/AstBu/69.296
Title:
Speckle interferometry of Ap stars. II.
Short Name:
J/other/AstBu/69
Date:
21 Oct 2021
Publisher:
CDS
Description:
We present the results of speckle interferometric observations of 156 stars possessing global magnetic fields, carried out with the 6-m BTA telescope of the Special Astrophysical Observatory. Virtually all stars were observed between 2010 and 2012. Thirty-four stars were resolved into individual components (31 double and 3 triple), of which 14 binary systems (BD+41 43, HD2887, HD30466, HD36540, HD36955, HD37479, HD61045, HD89069, HD144334, HD164258, HD349321, HD343872, HD184471, HD196691) and 2 triple systems (HD37140, HD338226) were for the first time resolved by the astrometric method.
545. Speckle interferometry of HIP binaries
ID:
ivo://CDS.VizieR/J/AJ/121/3224
Title:
Speckle interferometry of HIP binaries
Short Name:
J/AJ/121/3224
Date:
21 Oct 2021
Publisher:
CDS
Description:
The Hipparcos satellite made measurements of over 9734 known double stars, 3406 new double stars, and 11,687 unresolved but possible double stars. The high angular resolution afforded by speckle interferometry makes it an efficient means to confirm these systems from the ground, which were first discovered from space. Because of its coverage of a different region of angular separation-magnitude difference ({rho}-{Delta}m) space, speckle interferometry also holds promise to ascertain the duplicity of the unresolved Hipparcos "problem" stars. Presented are observations of 116 new Hipparcos double stars and 469 Hipparcos "problem stars," as well as 238 measures of other double stars and 246 other high-quality nondetections. Included in these are observations of double stars listed in the Tycho-2 Catalogue and possible grid stars for the Space Interferometry Mission.
546. Speckle interfero. nearby multiple stars. II
ID:
ivo://CDS.VizieR/J/AJ/162/156
Title:
Speckle interfero. nearby multiple stars. II
Short Name:
J/AJ/162/156
Date:
14 Mar 2022 06:50:24
Publisher:
CDS
Description:
Long-term monitoring at the 6m telescope of the Special Astrophysical Observatory of the Russian Academy of Sciences made it possible to improve the orbits of 15 objects (HIP689, HIP3951, HIP10438, HIP43948, HIP69962, HIP95995, HIP102029, HIP102357, HIP104383, HIP105947, HIP106255, HIP108917, HIP111546, HIP113726, HIP114922) and construct an orbital solution for HIP65327 for the first time. Observations have been carried out since 2007; that is, the accumulated data correspond to an interval of 13yr. As a result, most of the orbits were classified as "accurate" using the qualitative criteria by Worley & Heintz. A comparison of the mass sums and masses of the components calculated by two independent methods was made for objects with orbital solutions. The Gaia EDR3 parallax was used to obtain the fundamental parameters, as well as the Hipparcos and Gaia DR2 parallaxes.
547. Speckle observations of binary systems
ID:
ivo://CDS.VizieR/J/A+A/367/865
Title:
Speckle observations of binary systems
Short Name:
J/A+A/367/865
Date:
21 Oct 2021
Publisher:
CDS
Description:
From speckle observations made with the PISCO speckle camera at the Pic du Midi Observatory, we present high angular resolution astrometric data for 43 binary stars already observed by the Hipparcos satellite. This sample consists of mainly new Hipparcos eclipsing binaries with a visual companion closer than one arcsecond, chosen with the aim to study the dynamical implications of a third component on the observational parameters of the eclipsing system. In addition, we also included a selection of close visual binaries with few speckle data in order to analyse possible systematic departures between the speckle and the non-speckle orbits. The reduction method and the results are presented in detail. For the close visual binaries we confront our observations with the ephemerides based on the best known orbits. For the wide visual binaries the confrontation is made directly with the Hipparcos data. Our observations are consistent both with previous speckle data and with most of the Hipparcos measurements.
548. Spectroscopic survey of 479 thick disc stars
ID:
ivo://CDS.VizieR/J/A+A/535/A107
Title:
Spectroscopic survey of 479 thick disc stars
Short Name:
J/A+A/535/A107
Date:
21 Oct 2021
Publisher:
CDS
Description:
In the era of large spectroscopic surveys, Galactic archaeology aims to understand the formation and evolution of the Milky Way by means of large datasets. In particular, the kinematic and chemical study of the thick disc can give valuable information on the merging history of the Milky Way. Our aim is to detect and characterise the Galactic thick disc chemically and dynamically by analysing F, G and K stars, whose atmospheres reflect their initial chemical composition. We performed a spectroscopic survey of nearly 700 stars probing the Galactic thick disc far from the solar neighbourhood towards the Galactic coordinates (l~277{deg}, b~47{deg}). The derived effective temperatures, surface gravities and overall metallicities were then combined with stellar evolution isochrones, radial velocities and proper motions to derive the distances, kinematics and orbital parameters of the sample stars. The targets belonging to each Galactic component (thin disc, thick disc, halo) were selected either on their kinematics or according to their position above the Galactic plane, and the vertical gradients were also estimated.
549. SPF3 Catalogue
ID:
ivo://CDS.VizieR/I/78
Title:
SPF3 Catalogue
Short Name:
I/78
Date:
21 Oct 2021
Publisher:
CDS
Description:
(no description available)
550. SPF1 Catalogue
ID:
ivo://CDS.VizieR/I/82
Title:
SPF1 Catalogue
Short Name:
I/82
Date:
21 Oct 2021
Publisher:
CDS
Description:
(no description available)

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