Extreme-ultraviolet observations of nearby B stars - Constraints on hot circumstellar plasma

Details Extreme-ultraviolet observations of nearby B stars - Constraints on hot circumstellar plasma Extreme-ultraviolet observations of nearby B stars - Constraints on hot circumstellar plasma

Jul 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978apj...223l..89p&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor, vol. 223, July 15, 1978, p. L89-L92.

Astronomy and Astrophysics

Astrophysics

1

B Stars, Early Stars, Far Ultraviolet Radiation, High Temperature Plasmas, Interstellar Radiation, Diffuse Radiation, Plasma Radiation, Plasma Temperature, Stellar Winds

Scientific paper

The extreme-ultraviolet telescope on the Apollo-Soyuz Test Project Mission observed several nearby stars of spectral type earlier than B3 in search of thermal emission from possible hot circumstellar plasma. The stars studied in the 45-185 and 114-185 A passbands of the instrument included Lambda Sco, Nu Sco, Beta CMa, Beta Cen, Sigma Sgr, and Alpha Pav. Diffuse emission around these stars in excess of about 1 billionth erg/sq cm/sec per sr/eV in the 45-185 A band and about 1 hundred-millionth erg/sq cm/sec per sr/eV in the 114-185 A band was not detected. The experimental data have been used to place upper limits on the emission measure of the plasma and the stellar-wind luminosity, using standard models. The data rule out the existence of sizable bubbles of hot plasma around any of the stars surveyed. In all cases the electron density in these regions, if they exist, may not exceed about 0.2 electron/cu cm.

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