Spectropolarimetry of Omicron Ceti /Mira/ - Discovery of polarized Balmer emission

Details Spectropolarimetry of Omicron Ceti /Mira/ - Discovery of polarized Balmer emission Spectropolarimetry of Omicron Ceti /Mira/ - Discovery of polarized Balmer emission

Dec 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978apj...226l.145m&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor, vol. 226, Dec. 15, 1978, p. L145-L148. Research supported by the Science

Astronomy and Astrophysics

Astrophysics

24

Astronomical Spectroscopy, Mira Variables, Omicron Ceti Star, Polarimetry, Variable Stars, Absorption Spectra, Balmer Series, Emission Spectra, H Beta Line

Scientific paper

Detailed polarization curves of Mira are examined which were obtained around phase 0.95 over the wavelength range from 3250 to 9700 A with three polarimeters and both wide- and narrow-band interference filters. It is found that: (1) the Balmer emission lines exhibit unexpectedly large polarization relative to the continuum; (2) there are large variations in polarization across the molecular bands of TiO; (3) there is a deep and wide decrease in polarization in the violet; (4) the degree of polarization increases across each of the Balmer lines from H-alpha through H-delta; (5) the most rapid growth in polarization occurs in H-beta; (6) the polarization maximum of approximately 6.8% occurs about 0.5 A to the blue of the intensity maximum; and (7) there is no significant change in position angle across the emission. The measurements show that the polarization properties of Mira variables are more complex than can be accounted for by current models and that two distinct polarization mechanisms may be required to explain the continuum polarization and the polarization in the Balmer lines.

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