Oxygen-rich semiregular and irregular variables. A catalogue of circumstellar CO observations

Details Oxygen-rich semiregular and irregular variables. A catalogue of circumstellar CO observations Oxygen-rich semiregular and irregular variables. A catalogue of circumstellar CO observations

Aug 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999a%26as..138..299k&link_type=abstract

Astronomy and Astrophysics Supplement, v.138, p.299-322

Astronomy and Astrophysics

Astrophysics

47

Stars: Variables: General, Stars: Agb And Post-Agb, Stars: Circumstellar Matter, Stars: Mass-Loss, Radio Lines: Stars

Scientific paper

Using the SEST, the Onsala 20 m telescope, the JCMT, and the IRAM 30 m telescope we have carried out a survey of circumstellar CO(J=1-0, 2-1, 3-2, and 4-3) emission on a large sample of oxygen-rich semiregular (SRa and SRb) and irregular variables (Lb). A total of 109 stars were observed in at least one CO line: 66 were shown to have circumstellar CO line emission (7 SRa, 36 SRb, and 23 Lb variables), ~ 60% of the semiregulars and all but one of the irregulars were detected for the first time. Most stars were observed in at least two transitions. There is a total of 138 detected CO lines. For twelve stars strong interference from interstellar CO emission precluded detection. We present here a catalogue of all observational data and the spectra of all detections, as well as brief discussions on detection statistics (including its dependence on variability type, period, IRAS-colour, IRAS LRS-class, and M-subclass), line profiles (including line shape asymmetry, multi-component line shapes, and line intensity ratios), gas expansion velocity distributions, and correlations between CO line and IR continuum fluxes (including implications for the mass-loss mechanism). Based on observations collected using at the European Southern Observatory, La Silla, Chile, the Onsala Space Observatory, Chalmers Tekniska Högskola, Sweden, the James Clerk Maxwell Telescope, Hawaii and the IRAM 30~m telescope, Pico Veleta, Spain.

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