J/A+A/671/A80 89 Her 12CO and 13CO datacubes (Gallardo Cava+, 2023)
The nebula around the binary post-AGB star 89 Herculis.
Gallardo Cava I., Alcolea J., Bujarrabal V., Gomez-Garrido M.,
Castro-Carrizo A.
<Astron. Astrophys. 671, A80 (2023)>
=2023A&A...671A..80G 2023A&A...671A..80G (SIMBAD/NED BibCode)
ADC_Keywords: Stars, double and multiple ; Radio lines ; Radial velocities
Keywords: stars: AGB and post-AGB - binaries: general - circumstellar matter -
stars: individual: 89 Herculis - radio lines: stars -
ISM: planetary nebulae: general
Abstract:
There is a class of binary post-asymptotic giant branch (post-AGB)
stars that exhibit remarkable near-infrared (NIR) excess. These stars
are surrounded by disks with Keplerian or quasi-Keplerian dynamics and
outflows composed of gas escaping from the rotating disk. Depending on
the dominance of these components, there are two subclasses of binary
post-AGB stars: disk-dominated and outflow-dominated.
We aim to properly study the hourglass-like structure that surrounds
the Keplerian disk around 89 Her.
We present total-power on-the-fly maps of 12CO and 13CO J=2-1
emission lines in 89 Her. Previous studies are known to suffer from
flux losses in the most extended components. We merge these
total-power maps with previous NOEMA maps. The resulting combined maps
are expected to detect the whole nebula extent of the source.
Our new combined maps contain the entirety of the detectable flux of
the source and at the same time are of high spatial resolution thanks
to the interferometric observations. We find that the hourglass-like
extended outflow around the rotating disk is larger and more massive
than suggested by previous works. The total nebular mass of this very
extended nebula is 1.8x10-2M☉, of which ∼65% comes from the
outflow. The observational data and model results lead us to classify
the envelope around 89 Her as an outflow-dominated nebula, together
with R Sct and IRAS 19125+0343 (and very probably AI CMi, IRAS
20056+1834, and IRAS 18123+0511). The updated statistics on the masses
of the two post-AGB main components reveal that there are two distinct
subclasses of nebulae around binary post-AGB stars depending on which
component is the dominant one. We speculate that the absence of an
intermediate subclass of sources is due to the different initial
conditions of the stellar system and not because both subclasses are
in different stages of the post-AGB evolution.
Description:
All datacubes are combined maps from NOEMA+30m
All files are in FITS format and they are the final and reduced
datacubes used in the article. Each file is named as
IGC89Hertransition_merged.fits. IGC represent my name: Ivan
Gallardo Cava.
Objects:
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RA (2000) DE Designation(s)
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17 55 25.18 +26 02 59.9 89 Her = HR 6685
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
list.dat 163 2 List of fits datacubes
fits/* . 2 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
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Bytes Format Units Label Explanations
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1- 9 F9.5 deg RAdeg Right Ascension of center (J2000)
10- 18 F9.5 deg DEdeg Declination of center (J2000)
20- 23 I4 --- Nx Number of pixels along X-axis
25- 28 I4 --- Ny Number of pixels along Y-axis
30- 31 I2 --- Nz Number of slices
33- 38 I6 m/s bVRAD Lower limit of VRAD interval
40- 43 I4 m/s BVRAD Upper limit of VRAD interval
45- 47 I3 m/s dVRAD VRAD resolution
49- 54 I6 Kibyte size Size of FITS file
56- 83 A28 --- FileName Name of FITS file, in subdirectory fits
85-163 A79 --- Title Title of the FITS file
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Acknowledgements:
Ivan Gallardo Cava, i.gallardocava(at)oan.es
(End) Patricia Vannier [CDS] 06-Jan-2023