2 to 20 micron observations of mass loss from early-type stars

Details 2 to 20 micron observations of mass loss from early-type stars 2 to 20 micron observations of mass loss from early-type stars

Apr 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984apj...279..225a&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 279, April 1, 1984, p. 225-236.

Astronomy and Astrophysics

Astronomy

68

Early Stars, Infrared Astronomy, Stellar Mass Ejection, Stellar Spectrophotometry, Balmer Series, Data Acquisition, Emissivity, Interstellar Extinction, Optical Thickness, Stellar Models, Stellar Winds

Scientific paper

Values are derived for the infrared wind emission for 16 O, B, and A stars by comparing observed fluxes at K, L, M, N, and Q with photospheric model atmospheres. The infrared emission is strongly correlated with the emisison of the H-alpha recombination line, in agreement with models of thermal wind emission. The bulk of the wind material must be at a temperature which is near the stellar effective temperature. A combined analysis of the infrared data and previous radio observations shows that the velocity law varies dramatically from star to star. Any mass-loss rates derived from infrared data alone are therefore highly uncertain. For two stars, 9 Sgr and Cyg OB2 No. 9, the observed radio flux cannot be thermal emission from a stellar wind.

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