J/A+A/536/A55 Milli-arcsecond imaging of SS Lep (Blind+, 2011)
An incisive look at the symbiotic star SS Leporis.
Milli-arcsecond imaging with PIONIER/VLTI.
Blind N., Boffin H. M. J., Berger J.-P., Le Bouquin J.-B., Merand A.,
Lazareff B., Zins G.
<Astron. Astrophys. 536, A55 (2011)>
=2011A&A...536A..55B 2011A&A...536A..55B
ADC_Keywords: Binaries, spectroscopic ; Interferometry
Keywords: stars: AGB and post-AGB - accretion, accretion disks -
binaries: spectroscopic - stars: fundamental parameters -
techniques: interferometric - binaries: symbiotic
Abstract:
Determining the mass transfer in a close binary system is of prime
importance for understanding its evolution. SS Leporis, a symbiotic
star showing the Algol paradox and presenting clear evidence of
ongoing mass transfer, in which the donor has been thought to fill its
Roche lobe, is a target particularly suited to this kind of study.
Since previous spectroscopic and interferometric observations have not
been able to fully constrain the system morphology and
characteristics, we go one step further to determine its orbital
parameters, for which we need new interferometric observations
directly probing the inner parts of the system with a much higher
number of spatial frequencies.
We use data obtained at eight different epochs with the VLTI
instruments AMBER and PIONIER in the H and K bands. We performed
aperture synthesis imaging to obtain the first model-independent view
of this system. We then modelled it as a binary (whose giant is
spatially resolved) that is surrounded by a circumbinary disc.
Description:
The observations made use of the VLTI instruments AMBER and PIONIER.
The data are reduced. AMBER ones were obtained from archive data of
ESO (program IDs: 082.D-0019(A); 082.D-0019(B); 082.D-0019(D);
082.D-0062(A); 082.D-0019(E); 083.D-0028(A)). PIONIER data were
obtained during the commissioning of the instrument. Data cover eight
different epochs. They allowed to compute the orbit of the system and
the size of the giant star.
Objects:
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RA (2000) DE Designation(s)
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06 04 59.13 -16 29 03.9 SS Lep = HD 41511
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
list.dat 45 8 *List of FITS files in obs directory
obs/* . 8 FITS files
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Note on list.dat: The files are in the standard OIFITS format for optical
interferometry as described in Pauls et al. (2005PASP..117.1255P 2005PASP..117.1255P).
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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- 19 A19 --- FileName FileName, in subdirectory obs
23- 34 A12 --- Title Title of the file
36- 45 A10 "D/M/Y" ObsDate Observation date
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Acknowledgements:
Nicolas Blind, nicolas.blind(at)obs.ujf-grenoble.fr
(End) Nicolas Blind [IPAG, France], Patricia Vannier [CDS] 13-Dec-2011