F. Kerschbaum et H. Olofsson, Oxygen-rich semiregular and irregular variables - A catalogue of circumstellar CO observations, ASTR AST SS, 138(2), 1999, pp. 299-322
Using the SEST, the Onsala 20 m telescope, the JCMT, and the IRAM 30 m tele
scope 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 i
n at least one CO line: 66 were shown to have circumstellar CO line emissio
n (7 SRa, 36 SRb, and 23 Lb variables), similar to 60% of the semiregulars
and all but one of the irregulars were detected for the first time. Most st
ars were observed in at least two transitions. There is a total of 138 dete
cted CO lines. For twelve stars strong interference from interstellar CO em
ission precluded detection.
We present here a catalogue of all observational data and the spectra of al
l detections, as well as brief discussions on detection statistics (includi
ng its dependence on variability type, period, IRAS-colour, IRAS LRS-class,
and M-subclass), line profiles (including line shape asymmetry, multi-comp
onent line shapes, and line intensity ratios), gas expansion velocity distr
ibutions, and correlations between CO line and IR continuum fluxes (includi
ng implications for the mass-loss mechanism).