Polarimetry of evolved stars. II. The carbon star R Scl

Details Polarimetry of evolved stars. II. The carbon star R Scl Polarimetry of evolved stars. II. The carbon star R Scl

Aug 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002a%26a...391..625y&link_type=abstract

Astronomy and Astrophysics, v.391, p.625-631 (2002)

Astronomy and Astrophysics

Astrophysics

1

Polarization, Stars: Circumstellar Matter, Stars: Carbon, Stars: Individual: R Scl, Stars: Variables: General

Scientific paper

We present broadband optical polarimetry of the carbon star R Scl, primarily in the VRCIC bands. Polarimetric variability was detected on time-scales from hours to years. The polarization of R Scl showed a ~ lambda -4 wavelength-dependence, which we attribute to scattering by small amorphous carbon dust grains. We deduce the properties of the circumstellar condensations in which the scattering takes place, and find consistency with infrared data if the condensations move in eccentric orbits. We also conclude that the condensations are tidally dispersed on a time-scale ~ 1 day. On longer time-scales, polarimetric variations may possibly be linked with photometric variations.

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