J/A+A/648/A93 4 post-AGB stars datacubes (Gallardo Cava+, 2021)
Keplerian disks and outflows in post-AGB stars:
AC Herculis, 89 Herculis, IRAS 19125+0343, and R Scuti.
Gallardo Cava I., Gomez-Garrido M., Bujarrabal V., Castro-Carrizo A.,
Alcolea J., Van Winckel H.
<Astron. Astrophys. 648, A93 (2021)>
=2021A&A...648A..93G 2021A&A...648A..93G (SIMBAD/NED BibCode)
ADC_Keywords: Planetary nebulae ; Radio lines ; Carbon monoxide
Keywords: stars: AGB and post-AGB - binaries: general - circumstellar matter -
radio lines: stars -
ISM: planetary nebulae: individual: AC Her, 89 Her, IRAS 19125+0343,
and R Sct - techniques: interferometric
Abstract:
There is a class of binary post-AGB stars with a remarkable
near-infrared excess that are surrounded by Keplerian or
quasi-Keplerian disks and extended outflows composed of gas escaping
from the disk. The Keplerian dynamics had been well identified in four
cases, namely the Red Rectangle, AC Her, IW Car, and
IRAS 08544-4431. In these objects, the mass of the outflow represents
∼10% of the nebular mass, the disk being the dominant component of the
nebula.
We aim to study the presence of rotating disks in sources of the same
class in which the outflow seems to be the dominant component.
We present interferometric NOEMA maps of 12CO and 13CO J=2-1 in
89 Her and 12CO J=2-1 in AC Her, IRAS 19125+0343, and R Sct.
Several properties of the nebula are obtained from the data and model
fitting, including the structure, density, and temperature
distributions, as well as the dynamics. We also discuss the
uncertainties on the derived values.
The presence of an expanding component in AC Her is doubtful, but
thanks to new maps and models, we estimate an upper limit to the mass
of this outflow of ≤3x10-5M^☉_, that is, the mass of the
outflow is ≤5% of the total nebular mass. For 89 Her, we find a
total nebular mass of 1.4x10-2M☉, of which ∼50% comes from an
hourglass-shaped extended outflow. In the case of IRAS 19125+0343, the
nebular mass is 1.1x10-2M☉, where the outflow contributes ∼70%
of the total mass. The nebular mass of R Sct is 3.2x10-2M☉, of
which ∼75% corresponds to a very extended outflow that surrounds the
disk.
Our results for IRAS 19125+0343 and R Sct lead us to introduce a new
subclass of binary post-AGB stars, for which the outflow is the
dominant component of the nebula. Moreover, the outflow mass fraction
found in AC Her is smaller than those found in other disk-dominated
binary post-AGB stars. 89 Her would represent an intermediate case
between both subclasses.
Description:
All datacubes are obtained from NOEMA interferometer. All files are in
FITS format and they are the final and reduced datacubes used in the
article. Each file is named as IGCsourcetransition.fits. IGC
represent my name: Ivan Gallardo Cava.
Objects:
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RA (2000) DE Designation(s)
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17 55 25.19 +26 03 00.0 89 Her = * 89 Her
18 30 16.24 +21 52 00.6 AC Her = V* AC Her
19 15 01.18 +03 48 42.6 IRAS 19125+0343 = BD+03 3950
18 47 28.95 -05 42 18.5 R Scuti = V* R Sct
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File Summary:
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FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
list.dat 193 5 List of fits datacubes
fits/* . 5 Individual fits datacubes
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See also:
J/A+A/559/A111 : 89 Her interferometric study (Hillen+, 2013)
Byte-by-byte Description of file: list.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 15 A15 --- Name Star name
17- 25 F9.5 deg RAdeg Right Ascension of center (J2000)
26- 34 F9.5 deg DEdeg Declination of center (J2000)
36- 39 I4 --- Nx Number of pixels along X-axis
41- 44 I4 --- Ny Number of pixels along Y-axis
46- 48 I3 --- Nz Number of slices
50- 57 F8.4 km/s bVRAD Lower value of VRAD interval
59- 67 F9.5 km/s BVRAD Upper value of VRAD interval
69- 76 F8.3 m/s dVRAD VRAD resolution
78- 83 I6 Kibyte size Size of FITS file
85-114 A30 --- FileName Name of FITS file, in subdirectory fits
116-193 A78 --- Title Title of the FITS file
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Acknowledgements:
Ivan Gallardo Cava, i.gallardo(at)oan.es
(End) Patricia Vannier [CDS] 08-Mar-2021