Extended OH maser emission from circumstellar shells and the envelope around OH 26.5 + 0.6

Details Extended OH maser emission from circumstellar shells and the envelope around OH 26.5 + 0.6 Extended OH maser emission from circumstellar shells and the envelope around OH 26.5 + 0.6

Nov 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...250l..79b&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor, vol. 250, Nov. 15, 1981, p. L79-L83.

Astronomy and Astrophysics

Astrophysics

45

Hydroxyl Emission, Infrared Stars, Interstellar Masers, M Stars, Stellar Envelopes, Stellar Mass Ejection, Brightness Temperature, Spectral Energy Distribution, Stellar Models, Supergiant Stars

Scientific paper

The extended diffuse component of the 1612 MHz OH maser emission from circumstellar envelopes around OH/IR stars has been studied with the VLA spectral line system. The first results show extended emission, in some cases distributed over several arc seconds, with maser line brightness temperatures of 10,000-1,000,000 K. The emission from OH 26.5 + 0.6 shows an overall velocity structure consistent with an expanding circumstellar shell model. The inner and outer radii of the masing shell are 0.4-1.1 and 4.6 x 10 to the 16th cm, respectively. Large-scale spatial asymmetries appear in the shell, with evidence of a ringlike structure seen edge-on. This structure appears to be a reflection of actual density variations within the envelope, rather than the effect of velocity crowding or of variations in the infrared pump rate. New, independent determinations give distances for IRC + 10011 and OH 26.5 + 0.6 of 570 and 800 pc, respectively.

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