Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987mnras.224..335s&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 224, Jan. 15, 1987, p. 335-348.
Astronomy and Astrophysics
Astronomy
46
Infrared Spectra, M Stars, Stellar Atmospheres, Stellar Envelopes, Stellar Models, Stellar Spectrophotometry, Radio Spectra, Silicates, Stellar Mass Ejection, Stellar Temperature, Stellar Winds
Scientific paper
Spectra covering the 7-23 micron region of the M2Ia star Alpha Orionis have been obtained with the IRAS Low Resolution Spectrometer. These, together with IRAS photometric data and previously published microwave data, have been used to develop a model of the star's outer atmosphere and circumstellar shell. The model fits all the observations closely when three distinct radio-emitting regions are considered; a warm, partly ionized wind; a warm, partly ionized region extending to about 1.8 photospheric radii (consisting of both outflowing and infalling material); and a denser, partly ionized region more closely resembling the solar Transition Region. The 9.7 and 18 micron circumstellar silicate features are modelled using previously published optical constants for amorphous olivine grains with a distribution of grain sizes in an optically thin shell. Estimates are made for the dust-to-gas ratio and the mass-loss rate from the star.
Skinner Christopher J.
Whitmore Bradley
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