J/A+A/642/A152 HD101584 VLTI/PIONIER images (Kluska+, 2020)
VLTI/PIONIER reveals the close environment of the evolved system HD 101584.
Kluska J., Olofsson H., Van Winckel H., Khouri T., Wittkowski M.,
de Wit W.J., Humphreys E.M.L., Lindqvist M., Maercker M., Ramstedt S.,
Tafoya D., Vlemmings W.H.T.
<Astron. Astrophys. 642, A152 (2020)>
=2020A&A...642A.152K 2020A&A...642A.152K (SIMBAD/NED BibCode)
ADC_Keywords: Stars, double and multiple ; Interferometry
Keywords: stars: AGB and post-AGB - binaries: general - circumstellar matter -
stars: winds, outflows - techniques: high angular resolution -
techniques: interferometric
Abstract:
The observed orbital characteristics of post-asymptotic giant branch
(post-AGB) and post-red giant branch (post-RGB) binaries are not
understood. We suspect that the missing ingredients to explain them
probably lie in the continuous interaction of the central binary with
its circumstellar environment.
We aim at studying the circumbinary material in these complex systems
by investigating the connection between the innermost and large-scale
structures.
We perform high-angular resolution observations in the near-infrared
continuum of HD101584, which has a complex structure as seen at
millimeter wavelengths with a disk-like morphology and a bipolar
outflow due to an episode of strong binary interaction. To account for
the complexity of the target we first perform an image reconstruction
and use this result to fit a geometrical model to extract the
morphological and thermal features of the environment.
The image reveals an unexpected double-ring structure. We interpret
the inner ring to be produced by emission from dust located in the
plane of the disk and the outer ring to be produced by emission from
dust that is located 1.6[D/1kpc] au above the disk plane. The inner
ring diameter (3.94[D/1kpc] au), and temperature (T=1540±10K) are
compatible with the dust sublimation front of the disk. The origin of
the out-of-plane ring (with a diameter of 7.39[D/1kpc] au and a
temperature of 1014±10K) could be due to episodic ejection or a dust
condensation front in the outflow.
The observed outer ring is possibly linked with the blue-shifted side
of the large scale outflow seen by ALMA and is tracing its launching
location to the central star. Such observations give morphological
constraints on the ejection mechanism. Additional observations are
needed to constrain the origin of the out-of-plane structure.
Description:
The FITS files contain image reconstructions showed in the paper for
HD101584 using data from the VLTI/PIONIER instrument. There are two
image reconstructions corresponding to Fig.3 of the paper, for two
chromatic parameters: the stellar-to-total flux ratio (FS) and the
spectral index of the environment (DE). The images are normalized so
the total flux equals unity. The star is located at the centre (0, 0).
The chromatic parameters FS and DE are indicated as FSVAL and DEVAL
keywords in the header of the fits files. The central wavelength is
1.65 microns. The regularisation weight used is indicated in the MUVAL
header. The noise maps associated with the images are included in the
fits files. The fits file HD101584_image.fits is with FS=0.244 and
DE=2.45 and the fits file named HD101584_image2.fits is with FS=0.28
and DE=1.75. The images were done using SPARCO image reconstruction
approach (Kluska et al., 2014A&A...564A..80K 2014A&A...564A..80K).
Objects:
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RA (2000) DE Designation(s)
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11 40 58.81 -55 34 25.8 HD 101584 = V* V885 Cen
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
list.dat 90 2 List of fits files
fits/* . 2 Individual fits image
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Byte-by-byte Description of file: list.dat
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Bytes Format Units Label Explanations
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1- 9 F9.5 deg RAdeg Right Ascension of center (J2000)
10- 18 F9.5 deg DEdeg Declination of center (J2000)
20- 22 I3 Kibyte size Size of FITS file
24- 43 A20 --- FileName Name of FITS file, in subdirectory fits
45- 90 A46 --- Title Title of the FITS file
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Acknowledgements:
Jacques Kluska, jacques.kluska(at)kuleuven.be
(End) Patricia Vannier [CDS] 09-Oct-2020