Radio emission from the extended chromosphere of Alpha Orionis

Details Radio emission from the extended chromosphere of Alpha Orionis Radio emission from the extended chromosphere of Alpha Orionis

Dec 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982apj...263l..85n&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor, vol. 263, Dec. 15, 1982, p. L85-L87.

Astronomy and Astrophysics

Astrophysics

46

Chromosphere, Radio Emission, Red Giant Stars, Stellar Envelopes, Stellar Mass Ejection, Supergiant Stars, Late Stars, Orion Constellation, Radio Spectra, Spectrum Analysis, Stellar Radiation, Stellar Winds

Scientific paper

The red supergiant Alpha Orionis (Betelgeuse) has been detected at 1.46, 4.89, 15.0, and 22.5 GHz with the VLA. These observations fit a radio spectrum described by 0.24 nu(1.32 GHz) mJy. All radio observations of this star reported since 1972 fit the same spectrum, except for two single dish measurements that are too low by a factor of 2. This spectrum can be modeled by thermal emission from a spherically symmetric, partially ionized, chromospheric region (electron temperature approximately 10,000 K) extending from 1 to 4 stellar radii, with an electron density radial power law of -3.59. Current wave-driven models for mass loss in late-type supergiants can account for the existence of such a region.

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