The DELTA photon counting camera concept

Morel, S.; Koechlin, Laurent

doi:10.1051/aas:1998232

Cited by 4 publications

(2 citation statements)

References 22 publications

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“…F.1, F.2 and F.3). The photometric data is coming from Johnson-Cousins bands (Johnson et al 1966;Johnson & Mitchell 1975;Morel & Magnenat 1978;Mermilliod et al 1997;Kharchenko 2001;Ducati 2002;Mermilliod 2006;Richmond 2007;Lasker et al 2008;Ofek 2008;Anderson & Francis 2012;Nascimbeni et al 2016;Henden et al 2016), Geneva photometry (Mermilliod et al 1997) and Strömgren photometry (Hauck & Mermilliod 1998;Paunzen et al 2001). For some targets, we also used photometry from TYCHO (Høg et al 2000;Hoeg et al 1997;Urban et al 1998) andGAIA (Gaia Collaboration 2016).…”

Section: Photometrymentioning

confidence: 99%

VLTI/PIONIER survey of disks around post-AGB binaries

Kluska

Winckel

Hillen

et al. 2019

A&A

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Context. Post-AGB binaries are surrounded by circumbinary disks of gas and dust that are similar to protoplanetary disks found around young stars. Aims. We aim to understand the structure of these disks and identify the physical phenomena at play in their very inner regions. We want to understand the disk-binary interaction and to further investigate the comparison with protoplanetary disks. Methods. We have conducted an interferometric snapshot survey of 23 post-AGB binaries in the near-infrared (H-band) using VLTI/PIONIER. We have fitted the multiwavelength visibilities and closure phases with purely geometrical models with an increasing complexity (including two point-sources, an azimuthally modulated ring and an over-resolved flux) in order to retrieve the sizes, temperatures and flux ratios of the different components.Results. All sources are resolved and the different components contributing to the H-band flux are dissected. The environment of these targets is very complex: 13/23 targets need models with thirteen or more parameters to fit the data. We find that the inner disk rims follow and extend the size-luminosity relation established for disks around young stars with an offset toward larger sizes. The measured temperature of the near-infrared circumstellar emission of post-AGB binaries is lower (T sub ∼1200 K) than for young stars, probably due to a different dust mineralogy and/or gas density in the dust sublimation region. Conclusions. The dusty inner rims of the circumbinary disks around post-AGB binaries are ruled by dust sublimation physics. Additionally a significant amount of the circumstellar H-band flux is over-resolved (14 targets have more than 10% of their non-stellar flux over-resolved) hinting for more structure from a yet unknown origin (disk structure or outflow). The amount of over-resolved flux is larger than around young stars. Due to the complexity of these targets, interferometric imaging is a necessary tool to reveal the interacting inner regions in a model-independent way.

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Section: Photometrymentioning

confidence: 99%

VLTI/PIONIER survey of disks around post-AGB binaries

Kluska

Winckel

Hillen

et al. 2019

A&A

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“…The system Hip70973 was discovered by Rossiter (1938.51) with the 27 inch (0.69 m) telescope at the Lamont-Hussey Observatory (Docobo et al 2000). Orbits of the system had been calculated by Couteau (1960), Morel (1970), Heintz (1981) (two orbits; the first one with period 45.4 yr and dynamical parallax 0. ′′ 020, and the second one with period 22.4 yr and dynamical parallax 0.…”

Section: Introductionmentioning

confidence: 99%

Physical Parameters of the Visually Close Binary Systems Hip70973 and Hip72479

Al-Wardat¹

2012

Publ. – Astron. Soc. Aust

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Atmospheric modelling of the components of the visually close binary systems Hip70973 and Hip72479 was used to estimate the individual physical parameters of their components. The model atmospheres were constructed using a grid of Kurucz solar metalicity blanketed models and used to compute a synthetic spectral energy distribution for each component separately, and hence for the combined system. The total observational spectral energy distributions of the systems were used as a reference for comparison with the synthetic ones. We used the feedback modified parameters and iteration method to obtain the best fit between synthetic and observational spectral energy distributions. The physical parameters of the components of the system Hip70973 were derived as T eff a ¼ 5700

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Concept of a photon-counting camera based on a diffraction-addressed Gray-code mask

Morel¹

2004

High-Energy Detectors in Astronomy

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The DELTA photon counting camera concept

Cited by 4 publications

References 22 publications

VLTI/PIONIER survey of disks around post-AGB binaries

VLTI/PIONIER survey of disks around post-AGB binaries

Physical Parameters of the Visually Close Binary Systems Hip70973 and Hip72479

Concept of a photon-counting camera based on a diffraction-addressed Gray-code mask

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