Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994a%26a...281..145s&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 281, no. 1, p. 145-160
Astronomy and Astrophysics
Astrophysics
43
Emission Spectra, Line Spectra, Polarization, Raman Spectra, Symbiotic Stars, Astronomical Polarimetry, Interstellar Matter, Radiant Flux Density, Stellar Envelopes, Stellar Models
Scientific paper
We observed spectropolarimetrically the emission lines at lambda 6825 and lambda 7082 in fifteen symbiotic stars. We find clear and sometimes very strong polarization in these lines in agreement with their recent identification as due to Raman scattering. We examine and remove the contribution of the interstellar polarization. We obtain polarization maps with surrounding field stars and find that at around 7000A the continuum polarization in symbiotic stars is mostly interstellar. Exceptions are RR Tel, He2-38 and possibly V1016 Cyg. The polarization integrated over the lambda 6825 and lambda 7082 lines is typically around 5%. We find striking variations in the degree and angle of the polarization across the line profiles. Maximum polarization can be as high as 15%. The polarization structure is always very similar in both lines. We can distinguish between three types of profiles with increasing complexity: 1. Profiles with constant polarization through the line, 2. Profiles with decreasing polarization towards the red line wing and constant polarization angle and 3. Profiles with two components and a rotating or flipping polarization angle. There are about equal numbers of symbiotic stars in each class. The last profile type is only seen in systems with late M giants or Miras. Examples are HBV 475, V1016 Cyg, RR Tel and He2-106. We present a simple model which can account for the morphological differences seen in the polarization structure. It shows that the double-peaked polarization profiles can only be produced in a very extended scattering region.
Schild Hans
Schmid Hans Martin
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