High-Resolution Imaging at the SOAR Telescope

Tokovinin, A.; Cantarutti, Rolando; Tighe, R.; Schurter, Patricio; Bliek, N. van der; Martinez, Manuel; Mondaca, Eduardo

doi:10.1086/657903

Cited by 33 publications

(30 citation statements)

References 29 publications

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“…This paper continues the previous series published by Tokovinin et al (2010b, hereafter TMH10), Tokovinin et al (2010a), Hartkopf et al (2012), Tokovinin (2012), and Tokovinin et al (2014, hereafter TMH14). Our primary goal is improvement of known orbital elements and determination of new orbits.…”

Section: Introductionsupporting

confidence: 87%

Speckle Interferometry at Soar in 2014

Tokovinin

Mason

Hartkopf

et al. 2015

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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• . 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.

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Section: Introductionsupporting

confidence: 87%

Speckle Interferometry at Soar in 2014

Tokovinin

Mason

Hartkopf

et al. 2015

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“…We report here a large set of double-star measurements made at the 4.1 m Southern Astrophysical Research Telescope (SOAR) with the speckle camera, HRCam. This paper continues the series published by Tokovinin, Mason, & Hartkopf (2010a, hereafter TMH10), Tokovinin et al (2010b), Hartkopf et al (2012), Tokovinin (2012), Tokovinin et al (2014), Tokovinin et al (2015), Tokovinin et al (2016a), and Tokovinin et al (2018a). Most data were taken during 2018, but some older, unpublished measurements are presented here as well.…”

Section: Introductionsupporting

confidence: 70%

Speckle Interferometry at SOAR in 2018

Tokovinin

Mason

Mendez

et al. 2019

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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 non-resolutions 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 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 years, 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.

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“…Additional imaging of NGC 3962 was acquired in the night of April 22, 2014, using the SOAR Adaptive Module (SAM) and its Imager (SAMI; Tokovinin et al 2010Tokovinin et al , 2012. SAM is a groundlayer adaptive optics system installed at the SOAR 4.1 m telescope at Cerro Pachón, Chile.…”

Section: Soar/sam Imagingmentioning

confidence: 99%

Isolated ellipticals and their globular cluster systems

Salinas

Alabi

Richtler

2015

A&A

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As tracers of star formation, galaxy assembly, and mass distribution, globular clusters have provided important clues to our understanding of early-type galaxies. But their study has been mostly constrained to galaxy groups and clusters where early-type galaxies dominate, leaving the properties of the globular cluster systems (GCSs) of isolated ellipticals as a mostly uncharted territory. We present Gemini-South/GMOS g i observations of five isolated elliptical galaxies: NGC 3962, NGC 2865, IC 4889, NGC 2271, and NGC 4240. Photometry of their GCSs reveals clear color bimodality in three of them, but remains inconclusive for the other two. All the studied GCSs are rather poor with a mean specific frequency S N ∼ 1.5, independently of the parent galaxy luminosity. Considering information from previous work as well, it is clear that bimodality and especially the presence of a significant, even dominant, population of blue clusters occurs at even the most isolated systems, which casts doubts on a possible accreted origin of metal-poor clusters, as suggested by some models. Additionally, we discuss the possible existence of ultra-compact dwarfs around the isolated elliptical NGC 3962.

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High-Resolution Imaging at the SOAR Telescope

Cited by 33 publications

References 29 publications

Speckle Interferometry at Soar in 2014

Speckle Interferometry at Soar in 2014

Speckle Interferometry at SOAR in 2018

Isolated ellipticals and their globular cluster systems

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