- ID:
- ivo://CDS.VizieR/J/AJ/162/41
- Title:
- Speckle interferometry at SOAR in 2020
- Short Name:
- J/AJ/162/41
- Date:
- 14 Mar 2022 06:54:42
- Publisher:
- CDS
- Description:
- The results of speckle interferometric observations at the 4.1m Southern Astrophysical Research Telescope in 2020, as well as earlier unpublished data, are given, totaling 1735 measurements of 1288 resolved pairs and nonresolutions of 1177 targets. We resolved for the first time 59 new pairs or subsystems in known binaries, mostly among nearby dwarf stars. This work continues our long-term speckle program. Its main goal is to monitor orbital motion of close binaries, including members of high-order hierarchies and Hipparcos pairs in the solar neighborhood. We also report observations of 892 members of young moving groups and associations, where we resolved 103 new pairs.
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- ID:
- ivo://CDS.VizieR/J/AJ/150/50
- Title:
- Speckle interferometry at SOAR in 2014
- Short Name:
- J/AJ/150/50
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- The results of speckle interferometric observations at the Southern Astrophysical Research Telescope (SOAR) telescope in 2014 are given. A total of 1641 observations were taken, yielding 1636 measurements of 1218 resolved binary and multiple stars and 577 non-resolutions of 441 targets. We resolved for the first time 56 pairs, including some nearby astrometric or spectroscopic binaries and ten new subsystems in previously known visual binaries. The calibration of the data is checked by linear fits to the positions of 41 wide binaries observed at SOAR over several seasons. The typical calibration accuracy is 0.{deg}1 in angle and 0.3% in pixel scale, while the measurement errors are on the order of 3 mas. The new data are used here to compute 194 binary star orbits, 148 of which are improvements on previous orbital solutions and 46 are first-time orbits.
- ID:
- ivo://CDS.VizieR/J/AJ/144/56
- Title:
- Speckle interferometry at SOAR in 2012
- Short Name:
- J/AJ/144/56
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- Results of speckle observations at the 4.1m SOAR telescope in 2012 (158 measures of 121 systems, 27 non-resolutions) are reported. The aim is to follow fast orbital motion of recently discovered or neglected close binaries and sub-systems. Here, eight previously known orbits are defined better, two more are completely revised, and five orbits are computed for the first time. Using differential photometry from Hipparcos or speckle and the standard relation between mass and absolute magnitude, the component's masses and dynamical parallaxes are estimated for all 15 systems with new or updated orbits. Two astrometric binaries HIP 54214 and 56245 are resolved here for the first time, another eight are measured. We highlight several unresolved pairs that may actually be single despite multiple historic measures, such as 104 Tau and f Pup AB. Continued monitoring is needed to understand those enigmatic cases.
- ID:
- ivo://CDS.VizieR/J/AJ/151/153
- Title:
- Speckle interferometry at SOAR in 2015
- Short Name:
- J/AJ/151/153
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- The results of speckle interferometric observations at the Southern Astrophysical Research Telescope in 2015 are provided, totaling 1303 measurements of 924 resolved binary and multiple stars, and non-resolutions of 260 targets. The separations range from 12mas to 3.37'' (median 0.17''); the maximum measured magnitude difference is 6.7mag. We resolved 27 pairs for the first time, including 10 as inner or outer subsystems in previously known binaries, e.g., the 50mas pair in {epsilon} Cha. Newly resolved pairs are commented upon. We discuss three apparently non-hierarchical systems that have been discovered in this series, arguing that their unusual configurations are the result of projection. The resolved quadruple system HIP71510 is also studied.
- ID:
- ivo://CDS.VizieR/J/AJ/158/48
- Title:
- Speckle interferometry at SOAR in 2018
- Short Name:
- J/AJ/158/48
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- The results of speckle interferometric observations at the 4.1 m Southern Astrophysical Research Telescope (SOAR) in 2018 are given, totaling 3097 measurements of 2427 resolved pairs with separations from 11 mas to 5.9" (median 0.15", magnitude difference up to 7 mag) and nonresolutions of 624 targets. This work continues our long-term speckle program. Its main goal is to monitor orbital motion of close binaries, including members of high-order hierarchies and Hipparcos pairs in the solar neighborhood. Also, pre-main-sequence stars in the Orion OB1 association were surveyed, resolving 26 out of 118 targets. In addition, we report the discovery of 35 new companions among field visual multiples (some of which are likely optical) and first-time resolutions of another 31 pairs. By combining the measurements given here with the published ones, we computed 76 orbits for the first time and updated orbital elements of 34 visual binaries. Their periods range from 0.65 to 1100 yr, and their quality varies from first tentative solutions of grade 5 to accurate elements of grades 1 and 2. Finally, a list of 53 spurious pairs discovered by various techniques and unresolved at SOAR is given.
- ID:
- ivo://CDS.VizieR/J/AJ/155/235
- Title:
- Speckle interferometry at SOAR in 2016 and 2017
- Short Name:
- J/AJ/155/235
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- The results of speckle interferometric observations at the 4.1 m Southern Astrophysical Research Telescope in 2016 and 2017 are given, totaling 2483 measurements of 1570 resolved pairs and 609 non-resolutions. We describe briefly recent changes in the instrument and observing method and quantify the accuracy of the pixel scale and position angle calibration. Comments are given on 44 pairs resolved here for the first time. The orbital motion of the newly resolved subsystem BU 83 Aa,Ab roughly agrees with its 36-year astrometric orbit proposed by J. Dommanget. Most Tycho binaries examined here turned out to be spurious.
- 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.
- ID:
- ivo://CDS.VizieR/J/AJ/142/56
- Title:
- Speckle interferometry at the USNO station
- Short Name:
- J/AJ/142/56
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- Results are presented for 299 speckle interferometric observations of double stars, obtained in 2008 at the USNO Flagstaff Station using the 1.55m Kaj Strand Astrometric Reflector. Separations range from 0.15" to 9.88", with a median of 2.22". This observing run concentrated on neglected systems, as well as systems in need of improved orbital elements; new orbital solutions have been determined for nine systems as a result.
- ID:
- ivo://CDS.VizieR/J/AJ/135/1334
- Title:
- Speckle interferometry at the USNO station
- Short Name:
- J/AJ/135/1334
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- Results are presented for 353 speckle interferometric observations of double stars, obtained in 2003 and 2004 at the USNO Flagstaff Station using the 1.55m Kaj Strand Astrometric Reflector. Separations range from 0.12" to 7.42", with a median of 0.42". These two observing runs concentrated on systems in need of improved orbital elements, and new solutions have been determined for 17 systems as a result.
- ID:
- ivo://CDS.VizieR/J/AJ/146/56
- Title:
- Speckle interferometry at the USNO. XIX.
- Short Name:
- J/AJ/146/56
- Date:
- 21 Oct 2021
- Publisher:
- CDS
- Description:
- The results of 2916 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 two thousand short-exposure images. These observations are averaged into 1584 mean relative positions and range in separation from 0.54'' to 98.09'', with a median separation of 11.73''. This is the 19th in this series of papers and covers the period 2012 January 5 through 2012 December 18. Also presented are 10 pairs that are reported for the first time, 17 pairs that appear to be lost, linear elements for 18 pairs, and orbital elements for 2 additional pairs.
