Separation of the intrinsic and interstellar linear polarization components of southern hemisphere early-type emission-line stars

Details Separation of the intrinsic and interstellar linear polarization components of southern hemisphere early-type emission-line stars Separation of the intrinsic and interstellar linear polarization components of southern hemisphere early-type emission-line stars

Jan 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979mnras.186..245m&link_type=abstract

Monthly Notices of the Royal Astronomical Society, vol. 186, Jan. 1979, p. 245-263. Research supported by the Science Research

Astronomy and Astrophysics

Astronomy

56

Early Stars, Emission Spectra, H Lines, Interstellar Radiation, Linear Polarization, Stellar Radiation, B Stars, Giant Stars, H Alpha Line, H Beta Line, Polarimetry, Shell Stars, Southern Hemisphere, Stellar Envelopes, Wolf-Rayet Stars

Scientific paper

Narrow-band spectropolarimetry in H-alpha and H-beta is reported for about 12 bright southern early-type emission-line stars. The stars observed include several Be shell stars and blue supergiants, as well as the Wolf-Rayet system Gamma-2 Vel. The intrinsic and interstellar polarizations are separated with reasonable success by a systematic analysis of all available data, including previously published broadband results. The largest intrinsic polarizations (at least 1.0%) are found for p Car, Epsilon Cap, and Pi Aqr, with intermediate polarizations of about 0.5% for Alpha Ara, Eta Cen, and Delta Cen, and weak polarizations of no more than 0.15% for Mu Cen, Alpha Col, and Omega Car. It is shown that Eta Cen now exhibits a much larger polarization than previously and that there are no significant line-polarization effects in either Gamma-2 Vel or any of the supergiants.

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