CCD Speckle Observations of Binary Stars From the Southern Hemisphere

Horch, Elliott; Ninkov, Zoran; Slawson, Robert W.

doi:10.1086/118631

Cited by 18 publications

(16 citation statements)

References 21 publications

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“…4). Soderblom et al (1998) (Horch et al 1997), whose primary component is a spectroscopic binary (Andersen et al 1985), as confirmed by our RV measurements. We computed the spectral type of both the spectroscopic companion (K7:V) and the visual companion (G6V).…”

Section: Discussion Of Individual Starssupporting

confidence: 87%

Classification of EUV stellar sources detected by the ROSAT WFC

Cutispoto

Pastori

Tagliaferri

et al. 1999

Astron. Astrophys. Suppl. Ser.

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Abstract. We present the results of high-precision UBV (RI) c photometric observations and of spectroscopic radial velocity measurements obtained at the European Southern Observatory for a sample of 51 cool stars detected in the EUV by the ROSAT Wide Field Camera (WFC). Using also recent results from HIPPARCOS, we infer spectral types and investigate the single or binary nature of the sample stars. Optical variability, with periods in the 0.4-13 day range, has been detected for the first time in 15 of these stars.

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Section: Discussion Of Individual Starssupporting

confidence: 87%

Classification of EUV stellar sources detected by the ROSAT WFC

Cutispoto

Pastori

Tagliaferri

et al. 1999

Astron. Astrophys. Suppl. Ser.

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“…No other weighting of the input data was applied. After close inspection of the images, we discarded the classical x 2 approach (Horch et al 1997), as the photon and readout noise were not the only sources of variance seen in the power spectra. Quasi-systematic horizontal noisy structures played a quite serious role in our dark frames.…”

Section: Observations and Reductionsmentioning

confidence: 99%

Speckle Observations of Binary Stars with a 0.5 m Telescope

Rutkowski

Waniak

2005

PUBL ASTRON SOC PAC

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ABSTRACT. We present 36 observations of 17 visual binaries of moderate separation (ranging from 0Љ .15 to 0Љ .790) made with the 50 cm Cassegrain telescope of the Jagiellonian University in Kraków. The speckle interferometry technique was combined with modest optical hardware and a standard photometric CCD camera. We used broadband VRI filters without a Risley prism to reduce differential color refraction. Thus, we performed a model analysis to investigate the influence of this effect on the results of the measurements. For binary components of spectral type O-F, the difference of three spectral classes between them should bias their relative positions by no more than a couple of tens of milliarcseconds (mas) for moderate zenith distances. The statistical analysis of our results confirmed this conclusion. A cross-spectrum approach was applied to resolve the quadrant ambiguity. Our separations have rms deviations of 0Љ .012, and our position angles have rms deviations of 1Њ .8. Relative photometry in V, R, and I filters appeared to be the less accurately determined parameter. We discuss our errors in detail and compare them to other speckle data. This comparison clearly shows the quite good accuracy of our measurements. We also present an example of the enhancement of image resolution for an extended object with an angular size that is greater than the atmospheric coherence patch, using speckle interferometry techniques.

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“…With the CCD, we typically take 700 to 1000, 50 ms frames of a target object, where for all observations discussed here the speckle-strip method of Horch, Ninkov, & Slawson (1997) is employed. The CCD chip has been the same since the inception of the program; it is a front-illuminated Kodak device with 2038 Â 2048 pixel format and read noise of approximately 10 e À .…”

Section: Observations and Data Reductionmentioning

confidence: 99%

Speckle Observations of Binary Stars with the WIYN Telescope. II. Relative Astrometry Measures during 1998–2000

Horch

Robinson

Meyer

et al. 2002

The Astronomical Journal

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Five hundred twelve relative astrometry measures are presented for 253 double stars, including 53 double stars discovered by Hipparcos. In 15 cases, relative astrometry is reported for the first time for newly confirmed pairs. In addition, 20 high-quality nondetections of companions are reported for stars suspected of being nonsingle by Hipparcos. Observations were taken using a fast-readout CCD camera system at the WIYN 3.5 m telescope at Kitt Peak, Arizona. In comparing these measures with ephemeris predictions for binary stars with very well known orbits, we find that the measurement precision is better than 3 mas in separation and 1 in position angle per individual observation. Measurement precision and detection capabilities are fully discussed, and confirmed orbital motion is reported in four cases of the Hipparcos double star discoveries.

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CCD Speckle Observations of Binary Stars From the Southern Hemisphere

Cited by 18 publications

References 21 publications

Classification of EUV stellar sources detected by the ROSAT WFC

Classification of EUV stellar sources detected by the ROSAT WFC

Speckle Observations of Binary Stars with a 0.5 m Telescope

Speckle Observations of Binary Stars with the WIYN Telescope. II. Relative Astrometry Measures during 1998–2000

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