Detection of O I and Si II far-infrared fine-structure emission from Alpha Orionis

Details Detection of O I and Si II far-infrared fine-structure emission from Alpha Orionis Detection of O I and Si II far-infrared fine-structure emission from Alpha Orionis

Jun 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...410l.111h&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 410, no. 2, p. L111-L114.

Astronomy and Astrophysics

Astrophysics

23

Far Infrared Radiation, Fine Structure, Infrared Stars, Oxygen, Silicon, Supergiant Stars, Stellar Envelopes, Stellar Mass Ejection

Scientific paper

We have detected forbidden O I 63 micron and forbidden Si II 35 micron emission from the oxygen-rich, M2 lab supergiant, Alpha Orionis (Betelgeuse). The forbidden O I line flux is 2.4 +/- 0.2 x 10 exp -18 W/sq cm, and the forbidden Si II line flux is 0.9 +/- 0.4 x 10 exp -18 W/sq cm. These fluxes are consistent with the thermal model of Rodgers and Glassgold (1991), which indicates that the emission arises in dense, warm gas in Alpha Ori's inner envelope and implies that nearly all of the available O and Si is in atomic form. This is the first reported detection of FIR, fine-structure emission from the inner or transition region of a circumstellar envelope, where molecules and dust are expected to form.

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