Other
Scientific paper
Jan 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987pasp...99...62d&link_type=abstract
Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 99, Jan. 1987, p. 62-65. Research supported by the Indi
Other
7
Linear Polarization, Mira Variables, Polarimetry, Subdwarf Stars, Symbiotic Stars, White Dwarf Stars, Accretion Disks, Periodic Variations, Time Dependence, Ubv Spectra
Scientific paper
Linear polarization measurements of the R Aqr system are reported here. The R Aqr system shows strong wavelength dependence of percent polarization and position angle, which are strongly time dependent also. There is a large variation in percent polarization in the ultraviolet, whereas the variation decreases toward the red region. Contrary to the variation of percent polarization, the variation of polarization angle is small in the U band and large in the other bands, toward the red region. These observations support a binary model in which a hot white subdwarf accretes material from a Mira variable forming a disk around the subdwarf. When the accreting mass exceeds a critical limit, a jet-like structure at the polar regions of the subdwarf is formed. The U-band position-angle variations are suggestive of precession of the jet-like structure.
Deshpande M. R.
Joshi Umesh C.
Kameswara Rao N.
Kulshrestha A. K.
Raveendran A. V.
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