The digital speckle interferometer : preliminary results on 59 stars and 3C 273.

Blazit, A.; Bonneau, Dominique; Koechlin, Laurent; Labeyrie, A.

doi:10.1086/182447

Cited by 267 publications

(38 citation statements)

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“…Alternatively, the companion could be far from apastron and within the resolution limit of the image. This companion was also not seen in eight observations by Mason et al (1997) and in a single measurement by Blazit et al (1977). We do detect the long-known visual companion BU 1028 AB.…”

Section: Known Binariessupporting

confidence: 45%

Adaptive Optics Photometry and Astrometry of Binary Stars. II. A Multiplicity Survey of B Stars

2007

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We carried out a search for companions to B stars using the adaptive optics system of the Advanced ElectroOptical System 3.6 m telescope. We observed 70 B stars in the I band, finding 16 companions, 10 of which are newly discovered companions. For each system with a detected companion we give its measured astrometry and differential magnitude. We then put the observation in context of the system's known multiplicity and provide a somewhat crude estimate of its spectral type based on the single differential magnitude measurement. The separations range from 0.2 00 to 7.31 00 , and the differential magnitudes range from 1:41 AE 0:01 to 10:1 AE 0:5. Finally, we present a list of the null detections and discuss the implications of null detections of selected stars.

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Section: Known Binariessupporting

confidence: 45%

Adaptive Optics Photometry and Astrometry of Binary Stars. II. A Multiplicity Survey of B Stars

2007

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“…This SNR formula needs some changes to reflect the SNR of an Electron Multiplying CCD (EMCCD). First, the readout noise is as shown by equation (1). Second, the stochastic multiplication add noise by convoluting the pixel's signal and is reflected by a noise factor given by (Stanford and Hadwen, 2002) …”

Section: Introductionmentioning

confidence: 99%

L3CCD results in pure photon-counting mode

et al. 2004

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Theoretically, L3CCDs are perfect photon counting devices promising high quantum efficiency (~90%) and sub-electron readout noise ( <0.1 e -). We discuss how a back-thinned 512x512 frame-transfer L3CCD (CCD97) camera operating in pure photon counting mode would behave based on experimental data. The chip is operated at high electromultiplication gain, high analogic gain and high frame rate. Its performance is compared with a modern photon counting camera (GaAs photocathode, QE ~28%) to see if L3CCD technology, in its current state, could supersede photocathode-based devices.

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“…Since the pioneer observations of monochromatic radii of o Cet and R Leo by Labeyrie and co-workers (Bonneau & Labeyrie 1973;Blazit et al 1977;Labeyrie et al 1977;Bonneau et al 1982) and the first studies of dynamic Mira model atmospheres (Scholz & Takeda 1987;Bessell et al 1989), it has been known that the atmospheres of M-type Mira variables are geometrically very extended configurations. Layers of formation of strong absorption features may be two or more times as distant from the star's centre as the continuumforming layers.…”

Section: Introductionmentioning

confidence: 99%

The structure of H$\mathsf{_{2}}$O shells in Mira atmospheres

Tej

Lançon

Scholz³

2003

A&A

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Abstract. Dynamic models of M-type Mira variables predict the occurrence of water "shells", i.e. of zones of high H 2 O density and high H 2 O absorption inside the stellar atmosphere. The density, position and width of these shells is closely correlated with different types of two-component shapes of the intensity distribution on the disk in the H, K and L near-continuum bandpasses. We investigate these correlations and highlight the role of a spectrophotometric H 2 O index that warns against serious complications in diameter measurements in the case of substantial water contamination of the bandpass of observation. Simultaneous spectrophotometric and interferometric measurements may allow observers to estimate real continuum diameters more precisely.

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The digital speckle interferometer : preliminary results on 59 stars and 3C 273.

Cited by 267 publications

References 0 publications

Adaptive Optics Photometry and Astrometry of Binary Stars. II. A Multiplicity Survey of B Stars

Adaptive Optics Photometry and Astrometry of Binary Stars. II. A Multiplicity Survey of B Stars

L3CCD results in pure photon-counting mode

The structure of H$\mathsf{_{2}}$O shells in Mira atmospheres

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