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J/A+A/605/A116      ALMA FITS cubes of CO(1-0) and CO(2-1)   (Kerschbaum+, 2017)

Rings and filaments. The remarkable detached CO shell of U Antliae. Kerschbaum F., Maercker M., Brunner M., Lindqvist M., Olofsson H., Mecina M., De Beck E., Groenewegen M.A.T., Lagadec E., Mohamed S., Paladini C., Ramstedt S., Vlemmings W.H.T., Wittkowski M. <Astron. Astrophys. 605, A116 (2017)> =2017A&A...605A.116K (SIMBAD/NED BibCode)
ADC_Keywords: Stars, carbon ; Radio lines ; Carbon monoxide Keywords: stars: AGB and post-AGB - stars: carbon - stars: evolution - stars: mass loss Abstract: Our goal is to characterize the intermediate age, detached shell carbon star U Antliae morphologically and physically in order to study the mass-loss evolution after a possible thermal pulse. High spatial resolution ALMA observations of unprecedented quality in thermal CO lines allow us to derive first critical spatial and temporal scales and constrain modeling effects to estimate mass-loss rates for both the present day as well as the ejection period of the detached shell. The detached shell is remarkably thin, overall spherically symmetric, and shows a barely resolved filamentary substructure possibly caused by instabilities in the interaction zone of winds with different outflow velocities. The expansion age of the detached shell is of the order of 2700 years and its overall width indicates a high expansion-velocity and high mass-loss period of only a few hundred years at an average mass-loss rate of ∼10-5M/yr. The post-high-mass-loss-rate-epoch evolution of U Ant shows a significant decline to a substantially lower gas expansion velocity and a mass-loss rate amounting to 4x10-8M/yr, at present being consistent with evolutionary changes as predicted for the period between thermal pulses. Description: FITS image cubes of the CO(1-0) and CO(2-1) molecular line observations around the carbon AGB star U Antliae. The circumstellar envelope has been observed with ALMA (12m array + ACA + TP) in a mosaic of 110 x 110 arcseconds. The velocity resolution after binning is 1km/s, the systemic velocity is at 24.5km/s. Objects: -------------------------------------------- RA (2000) DE Designation(s) -------------------------------------------- 10 35 12.85 -39 33 45.3 U Ant = HR 4153 -------------------------------------------- File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file list.dat 144 2 List of data cubes fits/* 0 2 Individual datacubes
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) 21- 23 I3 --- Nx Number of pixels along X-axis 25- 27 I3 --- Ny Number of pixels along Y-axis 29- 30 I2 --- Nz Number of slices 32- 54 A23 --- Obs.Date Observation date 'YYYY-MM-DDThh:mm:ss.sss) 56- 66 E11.6 Hz bFreq Lower value of frequency interval 68- 78 E11.6 Hz BFreq Upper value of frequency interval 80- 85 I6 Hz dFreq Frequency resolution 87- 92 I6 Kibyte size Size of FITS file 94-104 A11 --- FileName Name of FITS file, in subdirectory fits 106-144 A39 --- Title Title of the FITS file
Acknowledgements: Franz Kerschbaum, franz.kerschbaum(at)
(End) Patricia Vannier [CDS] 17-Aug-2017
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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