Narrowband polarimetry of southern red long-period variables

Details Narrowband polarimetry of southern red long-period variables Narrowband polarimetry of southern red long-period variables

Jul 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980aj.....85..875c&link_type=abstract

Astronomical Journal, vol. 85, July 1980, p. 875-881. Research supported by the Conselho Nacional de Desenvolvimento Cientifico

Mathematics

Logic

6

Late Stars, Linear Polarization, Polarimetry, Stellar Atmospheres, Variable Stars, Bandpass Filters, Calcium, Mira Variables, Molecular Spectra, Semiregular Variable Stars, Stellar Luminosity, Stellar Structure, Titanium Oxides

Scientific paper

Narrowband linear polarization observations are reported for four Mira variables and the semiregular variable L2 Pup. The polarization has been observed to change, across at least one of the two TiO bands studied, in R Car, R Cen, S Lep, and L2 Pup. This is most likely due to the variation of the source function and the ratio of absorption to scattering as a function of optical depth in the stellar photosphere. In L2 Pup the polarization also varies across the Ca I 4226-A line, indicating that Ca I is unevenly distributed across the stellar surface.

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