First Speckle Interferometry at SOAR Telescope with Electron-Multiplication CCD

Tokovinin, Andreï; Cantarutti, Rolando

doi:10.1086/528809

Cited by 52 publications

(32 citation statements)

References 33 publications

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“…The observations reported here were obtained with the high-resolution camera (HRCam) -a fast imager designed to work at the 4.1-m SOAR telescope (Tokovinin & Cantarutti 2008). For practical reasons, the camera was mounted on the SOAR Adaptive Module (SAM, ).…”

Section: Instrument and Observing Methodsmentioning

confidence: 99%

Speckle Interferometry at Soar in 2015*

Tokovinin

Mason

Hartkopf

et al. 2016

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The results of speckle interferometric observations at the SOAR telescope in 2015 are given, totaling 1303 measurements of 924 resolved binary and multiple stars and non-resolutions of 260 targets. The separations range from 12 mas to 3. ′′ 37 (median 0. ′′ 17); the maximum measured magnitude difference is 6.7 mag. We resolved 27 pairs for the first time, including 10 as inner or outer subsystems in previously known binaries, e.g. the 50-mas pair in ǫ Cha. Newly resolved pairs are commented upon. We discuss three apparently non-hierarchical systems discovered in this series, arguing that their unusual configuration results from projection. The resolved quadruple system HIP 71510 is studied as well.

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Section: Instrument and Observing Methodsmentioning

confidence: 99%

Speckle Interferometry at Soar in 2015*

Tokovinin

Mason

Hartkopf

et al. 2016

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“…Speckle imaging has contributed in both areas over its long history, and indeed the technique has seen a resurgence in recent years due to the more widespread use of electron-multiplying CCDs (EMCCDs) in speckle work (Tokovinin & Cantarutti 2008;Docobo et al 2010;Horch et al 2011;Balega et al 2013). In addition to opening new parameter space for the measurement of binary systems due to their sensitivity and readout speed, these devices have enabled the use of speckle imaging for faint (stellar) companion detection for stars thought to host exoplanets (Howell et al 2011(Howell et al , 2016Furlan et al 2017;Hirsch et al 2017).…”

Section: Introductionmentioning

confidence: 99%

Observations of Binary Stars with the Differential Speckle Survey Instrument. VII. Measures from 2010 September to 2012 February at the WIYN Telescope

Horch¹,

Casetti-Dinescu²,

Camarata³

et al. 2017

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We report on speckle observations of binary stars carried out at the WIYN Telescope over the period from 2010 September through 2012 February, providing relative astrometry for 2521 observations of 883 objects, 856 of which are double stars and 27 of which are triples. The separations measured span a range of 0.01-1.75 arcsec. Wavelengths of 562, 692, and 880 nm were used, and differential photometry at one or more of these wavelengths is presented in most cases. 66 components were resolved for the first time. We also estimate detection limits at 0.2 and 1.0 arcsec for high-quality observations in cases where no companion was seen, a total of 176 additional objects. Detection limits vary based on observing conditions and signal-to-noise ratio, but are approximately 4 mag at 0.2 arcsec and 6 mag at 1.0 arcsec on average. Analyzing the measurement precision of the data set, we find that the individual separations obtained have linear measurement uncertainties of approximately 2 mas, and photometry is uncertain to approximately 0.1 mag in general. This work provides fundamental, well-calibrated data for future orbit and mass determinations, and we present three first orbits and total mass estimates of nearby K-dwarf systems as examples of this potential.

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“…We used the High-Resolution Camera (HRCam) -a fast imager designed to work at the 4.1-m SOAR telescope (Tokovinin & Cantarutti 2008). The camera was mounted on the SOAR Adaptive Optics Module (SAM; Tokovinin et al 2016a).…”

Section: Instrument and Observing Methodsmentioning

confidence: 99%

New Binaries in the ϵ Cha Association^*

Tokovinin

2017

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We present Adaptive Optics-aided speckle observations of 47 young stars in the ǫ Cha association made at the 4-m Southern Astrophysical Research Telescope in the I band. We resolved 10 new binary pairs, 5 previously known binaries and two triple systems, also previously known. In the separation range between 4 and 300 AU, the 30 association members of spectral types G0 and later host 6 binary companions, leading to the raw companion frequency of 0.010±0.04 per decade of separation, comparable to the main sequence dwarfs in the field. On the other hand, all 5 massive association members of spectral types A and B have companions in this range. We discuss the newly resolved and known binaries in our sample. Observed motions in the triple system ǫ Cha, composed of three similar B9V stars, can be described by tentative orbits with periods 13 and ∼900 years, and a large mutual inclination.

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First Speckle Interferometry at SOAR Telescope with Electron-Multiplication CCD

Cited by 52 publications

References 33 publications

Speckle Interferometry at Soar in 2015*

Speckle Interferometry at Soar in 2015*

Observations of Binary Stars with the Differential Speckle Survey Instrument. VII. Measures from 2010 September to 2012 February at the WIYN Telescope

New Binaries in the ϵ Cha Association^*

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First Speckle Interferometry at SOAR Telescope with Electron-Multiplication CCD

Cited by 52 publications

References 33 publications

Speckle Interferometry at Soar in 2015*

Speckle Interferometry at Soar in 2015*

Observations of Binary Stars with the Differential Speckle Survey Instrument. VII. Measures from 2010 September to 2012 February at the WIYN Telescope

New Binaries in the ϵ Cha Association*

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New Binaries in the ϵ Cha Association^*