J/A+A/493/1043 High spatial resolution observations of HM Sge (Sacuto+, 2009)
On the morphology of the compact dust shell in the symbiotic system HM Sagittae.
Sacuto S., Chesneau O.
<Astron. Astrophys. 493, 1043 (2009)>
=2009A&A...493.1043S 2009A&A...493.1043S
ADC_Keywords: Interferometry ; Stars, variable
Keywords: techniques: interferometric - techniques: high angular resolution -
stars: AGB and post-AGB - stars: binaries: symbiotic -
stars: circumstellar matter - stars: mass-loss
Abstract:
We present high spatial resolution observations of the close
circumstellar environment of the symbiotic system HM Sagittae
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
observations of HM Sge were conducted with the VLT Auxiliary
Telescopes (ATs) A0, D0, G1 and H0, providing projected baselines in
the range of 64 to 89 meters oriented from PA=72 to 127°.
The ATs observations were made during the nights of April 04, May
08/10/16, and July 30. All the observations were made under good
atmospheric conditions (average seeing ∼0.62") with the worst seeing
(∼1.05") during the night of July 30 2007.
The files includes all visibility and differential phase data recorded
from these observations as well as all the characteristics concerning
the observations. The log of the observations is shown in the third
part of table1. The set of data are complementary to the ones
corresponding to the first two parts of Table 1 of the paper
previously published in Sacuto et al. (2007, Cat. J/A+A/465/469)
Description:
All 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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19 41 57.1 +16 44 40 HM Sge = NOVA Sge 1975
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 48 10 Journal of observations
fig/* . 5 Spectrally-dispersed visibilities and
differential phases
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See also:
J/A+A/465/469 : High spatial resolution observations of HM Sge (Sacuto+, 2007)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 8 A8 --- Star Star name
10- 19 A10 "YYYY-MM-DD" Obs.date Observation date
21- 28 A8 "h:m:s" Obs.time Observation time (hh:mm:ss)
30- 31 I2 m Base ?=- Base length
33- 35 I3 deg PA ?=- Position angle
37- 48 A12 --- FileName Corresponding fits file, in subdirectory fig
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Acknowledgements:
Stephane Sacuto, stephane.sacuto(at)univie.ac.at
(End) Patricia Vannier [CDS] 09-Dec-2008