Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975apj...195..423f&link_type=abstract
Astrophysical Journal, vol. 195, Jan. 15, 1975, pt. 1, p. 423-440. NASA-NSF-supported research.
Astronomy and Astrophysics
Astronomy
173
Cosmic Dust, Infrared Astronomy, Interstellar Matter, Optical Polarization, Stellar Envelopes, Stellar Radiation, Variable Stars, Absorption Spectra, Abundance, Black Body Radiation, Emission Spectra, Light Scattering, Silicates, Silicon Carbides
Scientific paper
Twenty-five long-period variable stars exhibiting intrinsic variable polarization have been monitored over the range 3.5-11 microns for several cycles. No conclusive evidence for gross changes in amount of circumstellar grains has been found. Thus circumstellar infrared emission is attributed to the total abundance of grains surrounding the star, which does not change by a large amount with time, while intrinsic polarization is attributed to more localized scattering and absorption effects. Spectrophotometry with resolution of about 0.015 over the 8-14 microns wavelength range of several stars with different chemical compositions indicates excess emission characteristic of 3 types of grains: (1) 'blackbody' grains, (2) silicate grains, and (3) silicon carbide grains.
Forrest William John
Gillett Fred C.
Stein Wayne A.
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