Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26a...254..274l&link_type=abstract
Astronomy and Astrophysics, Vol.254, NO. FEB(I), P. 274, 1992
Astronomy and Astrophysics
Astrophysics
8
Interstellar Medium: Dust, Radiative Transfer, Stars: Atmospheres, Circumstellar Matter
Scientific paper
The stellar light scattered by an expanding circumstellar dust shell is redshifted. The modification of line profiles due to this redistribution in wavelength has already been studied by Romanik & Leung (1981). In this paper we consider other observable consequences of this process. Since the ratio between the direct starlight and the scattered light varies accross spectral features, at least two quantities must be affected: the visibility of interferometric fringes and, when the object presents a departure from spherical symmetry, the percentage linear polarization. Some results obtained by numerical simulation are presented. The relative variations of these two quantities are large for shells presenting a moderate extinction opacity (&tauex ˜ 1). For luminous late-type variable with low expansion velocity, observations require a high spectral resolution (Δλ ≲ 1 Å). However it seems possible to coordinate for brightest sources interferometric and polarimetric observations.
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