J/A+A/594/A106 eta Car velocity-resolved imaging (Weigelt+, 2016)
VLTI-AMBER velocity-resolved aperture-synthesis imaging of
eta Carinae with a spectral resolution of 12000.
Studies of the primary star wind and innermost wind-wind collision zone.
Weigelt G., Hofmann K.-H., Schertl D., Clementel N., Corcoran M.F.,
Damineli A., de Wit W.-J., Grellmann R., Groh J., Guieu S., Gull T.,
Heininger M., Hillier D.J., Hummel C.A., Kraus S., Madura T., Mehner A.,
Merand A., Millour F., Moffat A.F.J., Ohnaka K., Patru F., Petrov R.G.,
Rengaswamy S., Richardson N.D., Rivinius T., Schoeller M., Teodoro M.,
Wittkowski M.
<Astron. Astrophys. 594, A106 (2016)>
=2016A&A...594A.106W 2016A&A...594A.106W (SIMBAD/NED BibCode)
ADC_Keywords: Stars, luminous ; Stars, peculiar ; Stars, supergiant ;
Stars, late-type ; Interferometry
Keywords: stars: winds, outflows - stars: individual: eta Carinae -
stars: massive - stars: mass-loss - binaries: general -
techniques: interferometric
Abstract:
The mass loss from massive stars is not understood well. eta Carinae
is a unique object for studying the massive stellar wind during the
luminous blue variable phase. It is also an eccentric binary with a
period of 5.54yr. The nature of both stars is uncertain, although we
know from X-ray studies that there is a wind-wind collision whose
properties change with orbital phase.
We want to investigate the structure and kinematics of eta Car's
primary star wind and wind-wind collision zone with a high spatial
resolution of ∼6mas (∼14au) and high spectral resolution of R=12000.
Observations of eta Car were carried out with the ESO Very Large
Telescope Interferometer (VLTI) and the AMBER instrument between
approximately five and seven months before the August 2014 periastron
passage. Velocity-resolved aperture-synthesis images were
reconstructed from the spectrally dispersed interferograms.
Interferometric studies can provide information on the binary orbit,
the primary wind, and the wind collision.
Description:
We present the reconstructed images from Fig. 4 of the paper. The
interferometric data were taken with the ESO VLTI and the AMBER
instrument with high spectral resolution (R=12000) in many spectral
channels across the Brackett Gamma line at 2.166 micron.
96 images were reconstructed at velocity channels from -663km/s to
520km/s.
The velocity of each channel is coded into the filename.
Plate scale is 0.781mas/pixel. North is up, and east to the left. FOV
is 50mas.
The resolution of the images is ∼6 mas.
Objects:
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RA (2000) DE Designation(s)
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10 45 03.55 -59 41 04.0 eta Car = HR 4210
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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 96 List of fits reconstructed images
fits/* . 96 Individual fits reconstructed images
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See also:
J/ApJS/163/173 : UV spectrum of eta Car in 2003.5 (Gull+, 2006)
J/ApJS/168/289 : NUV spectrum of eta Car in 2003.5 (Nielsen+, 2007)
J/ApJS/181/473 : Analysis of the spectrum of η Car (Nielsen+, 2009)
J/A+A/540/A133 : η Car emission spectrum (1700-10400Å) (Zethson+, 2012)
J/AJ/150/109 : Spectroscopy of η Car in 2009 (Richardson+, 2015)
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- 21 I2 --- Nx Number of pixels along X-axis
23- 24 I2 --- Ny Number of pixels along Y-axis
26- 27 I2 Kibyte size Size of FITS file
29- 40 A12 --- FileName Name of FITS file, in subdirectory fits
42- 90 A49 --- Title Title of the FITS file
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Acknowledgements:
Gerd Weigelt, gweigelt(at)mpifr-bonn.mpg.de
(End) Patricia Vannier [CDS] 09-Sep-2016