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Astron. Astrophys. Suppl. Ser.
Volume 119, Number 1, October_I 1996
Page(s) 61 - 90
Raman scattering in symbiotic stars. I. Spectropolarimetric observations DOI: 10.1051/aas:1996228

Astronomy and Astrophysics Supplement Series, Vol. 119, October I 1996, 61-90

Raman scattering in symbiotic stars. I. Spectropolarimetric observations

T.J. Harries and I.D. Howarth

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School of Physics and Astronomy, University of St. Andrews, North Haugh, St. Andrews, Fife KY16 9SS, Scotland
Dept. of Physics and Astronomy, University College London, Gower Street, London WC1E 6BT, UK

Received October 16; accepted December 9, 1995


We present high signal-to-noise, high-dispersion linear spectropolarimetry of the Raman-scattered 6825, 7082 Å emission lines in 27 southern-hemisphere symbiotic systems. We give continuum polarization measurements for all the targets (together with estimates of the foreground interstellar polarization), and new estimates of the red-giant spectral types in 23 systems. We confirm continuum-polarization variability in five out of eight systems with previous high-quality photopolarimetry. The Raman lines are fully resolved; although they display a wide variety of morphologies, both the intensity and polarization profiles appear basically to be triple-peaked. Spectra of five systems observed in both 1992 and 1994 show stable Raman-line intensity profiles, but with significant variations in the polarization structure.

Key words: stars --- stars: binaries: symbiotic --- stars: late-type --- stars: mass-loss --- polarization

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