Deficiency of CO emission from massive envelopes around cool OH/IR stars

Details Deficiency of CO emission from massive envelopes around cool OH/IR stars Deficiency of CO emission from massive envelopes around cool OH/IR stars

Nov 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990a%26a...239..173h&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 239, no. 1-2, Nov. 1990, p. 173-185.

Astronomy and Astrophysics

Astronomy

65

Carbon Monoxide, Cool Stars, Emission Spectra, Hydroxyl Emission, Infrared Stars, Stellar Envelopes, Infrared Astronomy Satellite, Interstellar Masers, Optical Thickness, Stellar Magnitude, Telescopes

Scientific paper

Application of models for line rotation to highly evolved OH/IR stars with very cold circumstellar envelopes yields very low CO mass rates which conflict with determinations from IR and OH measurements. In this paper, this effect is investigated using CO observations with the IRAM telescope at Pico Veleta (Spain), of a sample of OH/IR stars which covers a range from blue to red IRAS colors. It was found that, on the basis of mass-loss rate and CO line parameters, the sample could be divided into two groups. Group 1 contains objects surrounded by optically thin envelopes which show relatively strong CO emission; for these stars, mass loss rates derived from CO and 60-micron emission agree within one order of magnitude. Group 2 contains cool objects with optically thick envelopes showing extremely weak CO emission; for this group, mass loss rates derived from CO lines are systematically lower by more than one order of magnitude than those derived from OH maser and IR fluxes. Possible causes of this effect are discussed.

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