Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980a%26as...42..141m&link_type=abstract
Astronomy and Astrophysics Supplement Series, vol. 42, Nov. 1980, p. 141-154.
Astronomy and Astrophysics
Astronomy
22
Cool Stars, Infrared Astronomy, Late Stars, Near Infrared Radiation, Polarimetry, Broadband, Cosmic Dust, M Stars, Stellar Envelopes, Supergiant Stars
Scientific paper
Broadband near-infrared polarimetry of 29 cool stars is presented. Measurements were made at the effective wavelengths 0.91 micron (I), 1.21 microns (J), 1.65 microns (H) and 2.18 microns (K). The program stars include M giants and supergiants, M- and S-type Mira variables and carbon stars. Theoretical calculations, interpreting the polarization in terms of the scattering properties of circumstellar dust grains, are also presented. Temporal variations of both the degree of polarization and its position angle are observed in most of the stars. The time scales of these changes (i.e. months) suggest that the sources of anisotropy lie close to the star. A wide range of spectral behavior was also found, a number of stars showing evidence of relatively large grains (radii approximately 0.1 micron to 1.0 micron) of either silicate or graphite composition. Complicated nonuniform scattering geometries are suggested by many of the results.
Hough James H.
McCall Alan
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