Simultaneous spectroscopic and polarimetric observations of Be stars

Details Simultaneous spectroscopic and polarimetric observations of Be stars Simultaneous spectroscopic and polarimetric observations of Be stars

Sep 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979msngr..18...19m&link_type=abstract

ESO Messenger, Sept. 1979, p. 19-21.

Astronomy and Astrophysics

Astronomy

4

Astronomical Spectroscopy, B Stars, Polarimetry, Variable Stars, Electron Scattering, Emission Spectra, H Alpha Line, Line Spectra, Shell Stars, Stellar Envelopes, Stellar Models, Stellar Rotation

Scientific paper

The physical nature of Be stars is discussed and simultaneous spectroscopic and polarimetric measurements of southern Be stars are reported. Models of circumstellar shells accounting for the observed broadening of emission lines are considered, and the relation between instrinsic stellar polarization and the geometry of stellar envelopes is pointed out. Observations of a total of 30 Be stars in the galactic plane by high-dispersion spectroscopy and narrow-band filter polarimetry during two observation periods separated by two years are discussed, and pronounced spectral variations in six stars observed in both periods are noted. Discrepancies between the shell shapes of the shell star pi Aqr predicted by H alpha line profiles and polarization measurements are also discussed.

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