K I 7699 A emission from the Betelgeuse shell

Details K I 7699 A emission from the Betelgeuse shell K I 7699 A emission from the Betelgeuse shell

Dec 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976apj...210..395b&link_type=abstract

Astrophysical Journal, vol. 210, Dec. 1, 1976, pt. 1, p. 395-401.

Astronomy and Astrophysics

Astrophysics

38

Infrared Stars, M Stars, Semiregular Variable Stars, Stellar Envelopes, Stellar Radiation, Supergiant Stars, Emission Spectra, Gas Density, Infrared Spectra, Photosphere, Radiant Flux Density, Stellar Spectra, Variable Stars

Scientific paper

A map of the circumstellar gas shell around Betelgeuse is presented from observations of the fluorescent emission in the K I 7699 A resonance line. The observations obtained at 3 sec and 5 sec from the star indicate approximate spherical symmetry in the 10 km/s expanding shell responsible for the blueshifted sharp cores seen in strong resonance and low excitation lines. Calculations show that the density of neutral K atoms is approximately constant between 3 sec and 5 sec from the star. The emission profiles in the west show a second, higher velocity, component at 5 sec from the star.

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