Optical and infrared observations of the carbon Mira R Fornacis - Dust shell modelling as a function of phase

Details Optical and infrared observations of the carbon Mira R Fornacis - Dust shell modelling as a function of phase Optical and infrared observations of the carbon Mira R Fornacis - Dust shell modelling as a function of phase

Jan 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988a%26a...190...79l&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 190, no. 1-2, Jan. 1988, p. 79-86.

Astronomy and Astrophysics

Astrophysics

53

Carbon Stars, Infrared Photometry, Mira Variables, Radiative Transfer, Stellar Envelopes, Visual Photometry, Cosmic Dust, Light Curve, Stellar Luminosity, Stellar Models

Scientific paper

Optical and infrared photometry, obtained between October 1982 and February 1987 on the carbon-rich Mira R For, is presented. The broad-band energy distributions at different phases are interpreted in terms of a self-consistent radiative transfer model. The increased obscuration of the central star around minimum is explained by the condensation of grains in the inner part of the circumstellar shell; this condensation appears to be a simple consequence of the lower stellar luminosity at minimum. Total luminosity between normal extrema is shown to vary by a factor of about 2.3. Optical depth at 1 micron is about 1.0 at minimum and about 0.7 at maximum. It is concluded that changes in the IR colors with phase are coherent with the assumption of a uniform outflow of matter. The unusual faintness of the 1983 minimum noted by Feast et al. (1984) is confirmed; it can be understood in terms of the model described, without invoking ejection of a discrete shell, or eclipse by a dust cloud.

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