J/A+A/640/A133 DEATHSTAR. Nearby AGB stars with ALMA ACA (Ramstedt+, 2020)
DEATHSTAR: Nearby AGB stars with ALMA ACA.
I. A new hope for accurate mass-loss-rate estimates.
Ramstedt S, Vlemmings W.H.T., Doan L., Danilovich T., Lindqvist M.,
Saberi M., Olofsson H., De Beck E., Groenewegen M.A.T., Hoefner S.,
Kastner J.H., Kerschbaum F., Khouri T., Maercker M., Montez R.,
Quintana-Lacaci G., Sahai R., Tafoya D., Zijlstra A.
<Astron. Astrophys. 640, A133 (2020)>
=2020A&A...640A.133R 2020A&A...640A.133R (SIMBAD/NED BibCode)
ADC_Keywords: Stars, nearby ; Stars, late-type ; Radio sources ; Abundances
Keywords: stars: late-type - radio - abundances
Abstract:
We present the re-calibrated and re-imaged fits-cubes of the first set
of data from the DEATHSTAR project (DEtermining Accurate mass-loss
rates for THermally pulsing AGB STARs, www.astro.uu.se/deathstar).
Forty-two southern AGB stars, 21 carbon stars and 21 M-type stars,
were mapped in Bands 6 and 7 with the Atacama Compact Array (ACA).
Source selection, detected line emission, data calibration procedures
etc. are described in detail in the paper. The beams are typically 4-8
and 3-5-arcseconds in Band 6 and 7, respectively. The rms noise level
reached is typically 50-70 and 100-150mJy/beam in Band 6 and 7,
respectively. More exact beam sizes and rms values for each source are
listed in the paper together with tentative line detections.
Description:
The sources were observed with the ACA in stand-alone mode in Cycle 4
in Bands 6 and 7 (project codes: 2016.2.00025.S and 2017.1.00595.S).
The correlator was set up with four spectral windows in each band. In
Band 6 the windows were centered on 216.2, 218.3, 230.7 and 232.1GHz.
In Band 7 they were centered on 330.75, 332.25, 343.52 and 345.6GHz.
Line emission from 12CO(2-1), (3-2), and 13CO(3-2) were covered in
this setup, as well as emission from a large number of other
chemically interesting molecules, including SiO, SiS, and CS, for
example. The spectral resolution of the imaged data was set to
0.75km/s in the 12CO and 13CO windows and to 1.0 and 1.5km/s in
the other spectral windows in Band 6 and 7, respectively. All data
were calibrated using the standard scripts and imaged using the CASA
package (McMullin et al., 2007, ASP Conf. Ser., 376, 127).
Self-calibration was performed using a small number of channels,
typically two, across the peak of the 12CO line and applied to all
sources in both bands. The catalog data have improved quality compared
to the data products provided in the ALMA archive. The fits cubes
provided covers each spectral window imaged separately resulting in
eight fits cubes per source. For each band a continuum image is
available generated from all the line free channels.
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
stars.dat 33 42 List of studied stars
list.dat 175 417 List of fits files
fits/* . 417 Individual fits files
--------------------------------------------------------------------------------
Byte-by-byte Description of file: stars.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 9 A9 --- Name Simbad name
11- 12 I2 h RAh Simbad right Ascension (J2000.0)
14- 15 I2 min RAm Simbad right Ascension (J2000.0)
17- 21 F5.2 s RAs Simbad right Ascension (J2000.0)
23 A1 --- DE- Simbad Declination sign (J2000.0)
24- 25 I2 deg DEd Simbad declination (J2000.0)
27- 28 I2 arcmin DEm Simbad declination (J2000.0)
30- 33 F4.1 arcsec DEs Simbad declination (J2000.0)
--------------------------------------------------------------------------------
Byte-by-byte Description of file: list.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 9 F9.5 deg RAdeg Right Ascension of center (J2000)
10- 18 F9.5 deg DEdeg Declination of center (J2000)
20- 21 I2 --- Nx Number of pixels along X-axis
23- 24 I2 --- Ny Number of pixels along Y-axis
26- 29 I4 --- Nz ? Number of slices for the datacubes
31- 56 A26 "datime" Obs.date Observation date
58- 64 F7.3 GHz Freq Observed frequency or lower value of frequency
interval for the datacubes
66- 72 F7.3 GHz BFreq ? Upper value of frequency interval for
the datacubes
74- 84 E11.6 Hz dFreq ? Frequency resolution for the datacubes
86- 90 I5 Kibyte size Size of FITS file
92-114 A23 --- FileName Name of FITS file, in subdirectory fits
116-175 A60 --- Title Title of the FITS file
--------------------------------------------------------------------------------
Acknowledgements:
Sofia Ramstedt, sofia.ramstedt(at)physics.uu.se
References:
McMullin et al., 2007, Astronomical Data Analysis Software and Systems XVI
ASP Conference Series, Vol. 376, proceedings of the conference held
15-18 October 2006 in Tucson, Arizona, USA. Edited by Richard A. Shaw,
Frank Hill and David J. Bell., p.127
(End) Patricia Vannier [CDS] 26-May-2020