J/A+A/493/L17 VLTI observations of V4334 Sgr (Chesneau+, 2009)
A dense disk of dust around the born-again Sakurai's object.
Chesneau O., Clayton G.C., Lykou F., De Marco O., Hummel C., Kerber F.,
Lagadec E., Nordhaus J., Zilstra A.A., Evans E.
<Astron. Astrophys. 493, L17 (2009)>
=2009A&A...493L..17C 2009A&A...493L..17C
ADC_Keywords: Planetary nebulae ; Interferometry
Keywords: ISM: planetary nebulae: individual: Sakurai's object -
stars: AGB and post-AGB - stars: circumstellar matter -
stars: mass-loss - techniques: high angular resolution -
techniques: interferometric
Description:
We present high spatial resolution observations in the mid-infrared of
the Sakurai's object (V4334 Sgr) obtained with the Very Large
Telescope Interferometer (VLTI) of ESO's Paranal Observatory and MIDI,
the MID-infrared Interferometric recombiner. MIDI combines the light
of two telescopes and provides spectrally resolved visibilities in
the N band atmospheric window. The optical interferometry data are
used in the paper from Chesneau et al. entitled "A dense disk of dust
around the born-again Sakurai's object" and are available in OI-FITS
format. The data were recorded in June 2007 under rather good
atmospheric conditions and were reduced with the EWS package. The data
set contains 6 spectrally dispersed calibrated visibilities and 6
differential phases. The files include all visibility data recorded
from these observations as well as all the characteristics concerning
the observations in the form of two OI-FITS files, for each night of
observation.
The log of the observations is shown in Table 1.
The data products are stored in the FITS-based, optical interferometry
data exchange format (OI-FITS), described in Pauls et al.
(2005PASP..117.1255P 2005PASP..117.1255P). The OI Exchange Format is a standard for
exchanging calibrated data from optical (visible/infrared) stellar
interferometers. The standard is based on the Flexible Image Transport
System (FITS), and supports storage of the optical interferometric
observations including visibilities and differential phases. Several
routines to read and write this format in various languages can be
found in: Webpage http://www.mrao.cam.ac.uk/~jsy1001/exchange .
Objects:
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RA (2000) DE Designation(s)
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17 52 32.7 -17 41 08 V4334 Sgr = V* V4334 Sgr
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 61 6 Observing log
fig/* . 2 Fits files
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See also:
II/229 : Sakurai's object (V4334 Sgr) in 1996-1998 (Arkhipova+ 1999)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1 I1 --- Onum Observation number
3- 11 A9 --- Star Star name
13- 22 A10 "YYYY-MM-DD" Obs.date Observation date
24- 28 A5 "h:m" Obs.time Observation time (hh:mm)
30- 34 A5 --- Baseline Baseline configuration
36- 39 F4.1 m Base ?=- Base (m)
41- 45 F5.1 deg PA ?=- Position angle (degree)
47- 61 A15 --- FileName Corresponding fits file, in subdirectory fig
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Acknowledgements:
Olivier Chesneau, Olivier.Chesneau(at)obs-azur.fr
(End) Patricia Vannier [CDS] 08-Dec-2008