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J/A+A/615/A8        APEX spectrum of R Dor (159.0-368.5GHz)     (De Beck+, 2018)

Circumstellar environment of the M-type AGB star R Doradus. APEX spectral scan at 159.0-368.5 GHz. De Beck E., Olofsson H. <Astron. Astrophys. 615, A8 (2018)> =2018A&A...615A...8D (SIMBAD/NED BibCode)
ADC_Keywords: Stars, giant ; Spectroscopy Keywords: stars: AGB and post-AGB - stars: individual: R Dor - stars: mass loss - astrochemistry Abstract: Our current insights into the circumstellar chemistry of asymptotic giant branch (AGB) stars are largely based on studies of carbon-rich stars and stars with high mass-loss rates. In order to expand the current molecular inventory of evolved stars we present a spectral scan of the nearby, oxygen-rich star R Dor, a star with a low mass-loss rate (∼2x10-7M/yr). We carried out a spectral scan in the frequency ranges 159.0-321.5GHz and 338.5-368.5GHz (wavelength range 0.8-1.9mm) using the SEPIA/Band-5 and SHeFI instruments on the APEX telescope and we compare it to previous surveys, including one of the oxygen-rich AGB star IK Tau, which has a high mass-loss rate (∼5x10-6M/yr). The spectrum of R Dor is dominated by emission lines of SO2 and the different isotopologues of SiO. We also detect CO, H2O, HCN, CN, PO, PN, SO, and tentatively TiO2, AlO, and NaCl. Sixteen out of approximately 320 spectral features remain unidentified. Among these is a strong but previously unknown maser at 354.2GHz, which we suggest could pertain to H2SiO, silanone. With the exception of one, none of these unidentified lines are found in a similarly sensitive survey of IK Tau performed with the IRAM 30 m telescope. We present radiative transfer models for five isotopologues of SiO (28SiO, 29SiO, 30SiO, Si17O, Si18O), providing constraints on their fractional abundance and radial extent. We derive isotopic ratios for C, O, Si, and S and estimate that, based on our results for 17O/18O, R Dor likely had an initial mass in the range 1.3-1.6M, in agreement with earlier findings based on models of H2O line emission. From the presence of spectral features recurring in many of the measured thermal and maser emission lines we tentatively identify up to five kinematical components in the outflow of R Dor, indicating deviations from a smooth, spherical wind. Description: The FITS file RDorAPEXTA_DeBeck2018.fits contains the fully reduced spectrum of R Dor in the range 159.0-368.5GHz obtained with APEX. The intensity is given in corrected antenna temperature, TA*, as described in Sect. 2 of the paper. Objects: -------------------------------------------- RA (2000) DE Designation(s) -------------------------------------------- 04 36 45.59 -62 04 37.8 R Dor = HR 1492 -------------------------------------------- File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file list.dat 195 1 Information on fist spectrum sp/* 0 1 Fits spectrum
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- 26 I7 --- Nx Number of pixels along X-axis 28- 50 A23 --- Obs.date Observation date (YYYY-MM-DDThh:mm:ss.sss) 52- 63 E12.5 Hz bFreq Lower value of frequency interval 65- 75 E11.5 Hz BFreq Upper value of frequency interval 77- 82 I6 Hz dFreq spectral resolution 84- 87 I4 Kibyte size Size of FITS file 89-116 A28 --- FileName Name of FITS file, in subdirectory sp 118-195 A78 --- Title Title of the FITS file
Acknowledgements: Elvire De Beck, elvire.debeck(at)chalmers.se
(End) Patricia Vannier [CDS] 24-Jan-2018
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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