J/A+A/555/A24 Aperture-synthesis imaging of Antares (Ohnaka+, 2013)
High spectral resolution imaging of the dynamical atmosphere of the red
supergiant Antares in the CO first overtone lines with VLTI/AMBER.
Ohnaka K., Hofmann K.-H., Schertl D., Weigelt G., Baffa C., Chelli A.,
Petrov R., Robbe-Dubois S.
<Astron. Astrophys. 555, A24 (2013)>
=2013A&A...555A..24O 2013A&A...555A..24O
ADC_Keywords: Stars, supergiant ; Stars, atmospheres ; Interferometry
Keywords: infrared: stars - techniques: interferometric - stars: late-type -
stars: atmospheres - stars: individual: Antares - supergiants
Abstract:
We present aperture-synthesis imaging of the red supergiant Antares
(alpha Sco) in the CO first overtone lines. Our goal is to probe the
structure and dynamics of the outer atmosphere.
Description:
Two animated gif movies made from high spectral resolution aperture-
synthesis imaging of the red supergiant Antares in the CO first
overtone lines near 2.3 micron. The observations were carried out with
the near-IR interferometric instrument AMBER at the Very Large
Telescope Interferometer with a spatial resolution of 9.8 mas and a
spectral resolution of 8000. The movies are based on the data taken in
2009.
The first movie (alfsco1.gif) shows the observed CO line spectrum from
2.28 and 2.31 micron in the lower panel (normalized with the
continuum). As the dot in the lower panel moves across the spectrum,
the image reconstructed at each wavelength is shown in the upper
panel. The reconstructed image at each wavelength is normalized with
its peak intensity. The images at 2.303275 and 2.303455 micron are
severely affected by bad data points and are unreliable.
The second movie (alfsco2.gif) shows the spatially resolved spectrum
at each position along a line across the stellar image. The movie
shows, in the lower panel, the reconstructed image of Antares in the
center of the CO line at 2.3058 micron. As the gray dot moves across
the stellar image, the spatially resolved spectrum at each position is
shown in red in the upper panel. The spatially resolved spectra are
scaled for comparison with the spatially unresolved spectrum shown in
black. The extraction of the spatially resolved spectra is described
in Sect. 3.3.
Objects:
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RA (2000) DE Designation(s)
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16 29 24.46 -26 25 55.2 Antares = V* alf Sco
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
list.dat 60 2 List of movies
alfsco1.gif 512 14393 Animated gif movie of reconstructed images
alfsco2.gif 512 1136 Animated gif movie of spatially resolved spectra
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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- 11 A11 --- FileName Name of the file
13- 60 A48 --- Title Title of the file
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Acknowledgements:
Keiichi Ohnaka, kohnaka(at)mpifr-bonn.mpg.de
Max Planck Institute for Radio Astronomy
(End) Keiichi Ohnaka [Max Planck Inst.], Patricia Vannier [CDS] 12-Jun-2013