New observations of atomic line scattering around Betelgeuse

Details New observations of atomic line scattering around Betelgeuse New observations of atomic line scattering around Betelgeuse

Jan 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990a%26a...227..141m&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 227, no. 1, Jan. 1990, p. 141-146.

Astronomy and Astrophysics

Astrophysics

19

Atomic Spectra, Light Scattering, M Stars, Red Giant Stars, Semiregular Variable Stars, Stellar Envelopes, Radiative Transfer, Stellar Mass Ejection, Stellar Spectrophotometry, Supergiant Stars

Scientific paper

New observations of atomic line scattering in the outer envelope of Betelgeuse are reported. Na I 5896-A line emission is detected for the first time using Fabry-Perot imaging and traced out to 17 arcsec from the star. The K I 7699-A line has been reobserved at offsets of 5 arcsec (E and S) and 7.5 arcsec (N) using spectroscopy with resolution 3 km/sec. The K I profiles show some differences with previously published data, probably because of an improved signal-to-noise ratio. They display asymmetries which are now in good qualitative agreement with the radiative-transfer calculations of Bernat (1976).

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