Effect of electron thermal motions on Thomson scattered line profiles from hot circumstellar envelopes

Details Effect of electron thermal motions on Thomson scattered line profiles from hot circumstellar envelopes Effect of electron thermal motions on Thomson scattered line profiles from hot circumstellar envelopes

Nov 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994a%26a...291..202w&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 291, no. 1, p. 202-208

Astronomy and Astrophysics

Astrophysics

13

Early Stars, Electron Scattering, Linear Polarization, Stellar Envelopes, Stellar Radiation, Maxwell-Boltzmann Density Function, Optical Thickness, Stellar Winds

Scientific paper

The effect of electron thermal motions on the polarization of light single Thomson scattered in a optically thin circumstellar envelope is investigated. When the central star is a point source of continuum radiation it is found that the scattered continuum polarization is unaffected by the electron thermal motions and the familar single scattering results dependent on envelope shape and stellar inclination are obtained. However, when the central star is a point source of line radiation the Doppler redistribution in frequency, due to the thermal motions of the isothermal envelope electrons, of scattered line radiation yields a symmetrically broadened spectropolarimetric line profile (in the absence of envelope bulk motion). These effects are illustrated and directly compared with previous analysis of line polarization arising through the Doppler redistribution of scattered radiation due to the bulk motions of the scattering material. It is shown that for early type stars, which possess slow (a few hundred km/s) winds, the 'thermal smearing' effect cannot be ignored.

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