J/A+A/631/A53 1-D optical spectra for IRAS19135+3937 (Bollen+, 2019)
A spatio-kinematic model for jets in post-AGB stars.
Bollen D., Kamath D., Van Winckel H., De Marco O.
<Astron. Astrophys. 631, A53 (2019)>
=2019A&A...631A..53B 2019A&A...631A..53B (SIMBAD/NED BibCode)
ADC_Keywords: Binaries, spectroscopic ; Line Profiles ; Spectroscopy
Keywords: stars: AGB and post-AGB - binaries: spectroscopic -
ISM: jets and outflows - circumstellar matter
Abstract:
We aim to determine the geometry, density gradient, and velocity
structure of jets in post-asymptotic giant branch (post-AGB) binaries.
Our high cadence time series of high-resolution optical spectra of
jet-creating post-AGB binary systems provide us with a unique
tomography of the jet. We determine the spatio-kinematic structure of
the jets based on these data by fitting the synthetic spectral line
profiles created by our model to the observed, orbital phase-resolved,
Hα-line profiles of these systems. The fitting routine is
provided with an initial spectrum and is allowed to test three
configurations, derived from three specific jet launching models: a
stellar jet launched by the star, an X-wind, and a disk wind
configuration. We apply a Markov-chain Monte Carlo routine in order to
fit our model to the observations. Our fitting code is tested on the
post-AGB binary IRAS19135+3937.
We find that a model using the stellar jet configuration gives a
marginally better fit to our observations. The jet has a wide
half-opening angle of about 76 degrees and reaches velocities up to
870km/s.
Our methodology is successful in determining some parameters for jets
in post-AGB binaries. The model for IRAS19135+3937 includes a
transparent, low density inner region (for a half-opening angle
<40°). The source feeding the accretion disk around the companion
is most likely the circumbinary disk. We will apply this jet fitting
routine to other jet-creating post-AGB stars in order to provide a
more complete description of these objects.
We aim at describing and understanding binary interaction processes in
systems with very evolved companions. Here, we focus on understanding
the origin and determining the properties of the high-velocity outflow
observed in one such system.
Description:
Reduced high-resolution (R∼85000) optical spectra of IRAS19135+3937.
These 22 spectra were obtained between March 2011 and September 2012
from the HERMES spectrograph, mounted on the 1.2m Flemish Mercator
telescope at La Palma, Canary Islands, Spain. The spectra cover a
wavelength range from 3770 to 9000 Angstroem in logscale. The flux is
given in arbitrary units. The spectra are collected as FITS files.
Objects:
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RA (2000) DE Designation(s)
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19 15 12.14 +39 42 50.5 IRAS 19135+3937 = V* V677 Lyr
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
list.dat 109 22 List of fits spectra
fits/* . 22 Individual 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- 6 I6 --- Nx Number of pixels along X-axis
8- 33 A26 --- Obs.date Observation date (YYYY-MM-DDThh:mm:ss.ssssss)
35- 41 F7.5 [0.1nm] logWmin Lower value of wavelength interval
43- 49 F7.5 [0.1nm] logWmax Upper value of wavelength interval
51- 61 E11.6 0.1nm dW Wavelength resolution
63- 66 I4 Kibyte size Size of FITS file
68- 78 A11 --- FileName Name of FITS file, in subdirectory fits
80-109 A30 --- Title Title of the FITS file
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Acknowledgements:
Dylan Bollen, dylan.bollendb(at)gmail.com
(End) Dylan Bollen [KU Leuven], Patricia Vannier [CDS] 24-Sep-2019