MK Classification of 142 Visual Binaries

Christy, J. W.; Walker, Richard L.

doi:10.1086/128831

Cited by 15 publications

(8 citation statements)

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“…Edwards (1976) has previously classified this as A1V + F2V while Christy & Walker (1969) classified them as A2V + F3V. However, Fekel (1992Fekel ( , 1980 found this to be a quadruple system.…”

Section: Ads 4617mentioning

confidence: 99%

Differential Binary Star Photometry Using the Adaptive Optics System at Starfire Optical Range

Brummelaar¹,

Mason²,

Bagnuolo³

et al. 1996

The Astronomical Journal

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As part of an NSF effort to make the Starfire Optical Range 1.5-m telescope, equipped with laser guide star and adaptive optics, available to the astronomical community, several nights in May and October of 1995 were awarded to the CHARA group in order to perform differential photometry on close binary stars. Images were acquired in two near-IR pass bands of over twenty pairs and reduced by fitting both the point spread function (PSF) and the positions and intensities of the stars. The ∆m values were calibrated using ten stars for which combined I and R photometric data were available in the literature.Color indices have been calculated for the individual components of these stars, allowing for the determination of spectral classifications of both components in seven of the systems.

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Section: Ads 4617mentioning

confidence: 99%

Differential Binary Star Photometry Using the Adaptive Optics System at Starfire Optical Range

Brummelaar¹,

Mason²,

Bagnuolo³

et al. 1996

The Astronomical Journal

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“…HD 62351 is a close binary with a separation of 0.4", resolvable through speckle. It is classified in the V-band as a G5III or G5/6IV(Christy & Walker 1969, Houk & Smith-Moore 1988. We confirm this classification in the R-band based on the line ratio Hα/λ6498, which is very sensitive to T eff (seetable 1).…”

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confidence: 99%

Evidence of a Black Hole in the X-Ray Transient GS 1354-64 (=BW Circini)

Casares

Zurita

Shahbaz

et al. 2004

ApJ

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We present the first radial velocity curve of the companion star to BW Cir which demonstrates the presence of a black hole in this X-ray transient which recorded outbursts in 1987 and 1997 (and possibly 1971-2). We identify weak absorption features corresponding to a G0-5III donor star, strongly veiled by a residual accretion disc which contributes 61-65 % of the total light at λ6300. The Doppler motions of these features trace an orbit of P = 2.54448 days (or its 1-yr alias of P = 2.56358 days) and velocity semi-amplitude K 2 = 279 ± 5 km s −1 (or K 2 = 292 ± 5 km s −1 ). Both solutions are equally possible. The mass function implied by the shorter period solution is f (M ) = 5.75 ± 0.30M ⊙ which, combined with the rotational broadening of the tidally locked companion (V sin i = 71 ± 4 km s −1 ), yields a compact object mass of M 1 sin 3 i = 7.34 ± 0.46M ⊙ . This is substantially above the mass of a neutron star under any standard equation of state of nuclear matter. The companion star is probably a G subgiant which has evolved off the main sequence in order to fill its Roche lobe. Remarkably, a distance of ≥27 kpc is inferred by the companion's luminosity and this is supported by the large observed systemic velocity (γ = 103 ± 4 km s −1 ) which requires such a distance in order to be consistent with the Galactic rotation curve.

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“…Note that this determination of the bolometric magnitude difference is in agreement with the value ∆H p = 0.91 ± 0.05 (ESA 1997), which is a good estimation for ∆M Bol due to the broadness of the H p passband since the difference in bolometric correction between the two components is small (they have very similar spectral types of F5III and F5IV). However, we caution these spectral classifications as they are simply based on a global spectral type designation and a not very precise visual estimate of the magnitude difference (Christy & Walker 1969). With this approach, a precision of ∼3-5 subclasses on the secondary spectral class is obtained for a magnitude difference smaller than 1.3 mag.…”

Section: Relative Photometry Of Hip 101769mentioning

confidence: 99%

Speckle observations of binary systems measured by Hipparcos

Prieur

Oblak

Lampens

et al. 2001

A&A

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Abstract. 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.

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MK Classification of 142 Visual Binaries

Cited by 15 publications

References 1 publication

Differential Binary Star Photometry Using the Adaptive Optics System at Starfire Optical Range

Differential Binary Star Photometry Using the Adaptive Optics System at Starfire Optical Range

Evidence of a Black Hole in the X-Ray Transient GS 1354-64 (=BW Circini)

Speckle observations of binary systems measured by Hipparcos

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