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The circumstellar environment of L2 Puppis

Published online by Cambridge University Press:  04 August 2017

Antonio Mario Magalhaes  and
George Vincent Coyne S.J.
Antonio Mario Magalhaes
Affiliation:
Instituto Astronomico e Geofisico, Universidade de Sao Paulo, Caixa Postal 30.627, Sao Paulo 01051, BRAZIL
George Vincent Coyne S.J.
Affiliation:
Specola Vaticana, V-00120 CITTA'DEL VATICANO

Abstract

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Polarimetric observations of the red semi-regular variable L2 Puppis, obtained over a period of several years, confirm significant variations across the CaI 4226 line and several TiO bands. Together with published infra-red data, the observations point to a fundamental symmetry plane to which all variations with wavelength and time are related. The data are also consistent with a combination of photospheric effects, including a non-uniform distribution of calcium across the stellar disk, and scattering from grains in a cloud in which there is a systematic variation in grain size with distance to the star. Grain growth and dissipation, as evidenced by the observations, occur on a time scale of several years, in contrast to the optical variability time scale of months.

Type
Circumstellar Dust and Chemistry
Information
Symposium - International Astronomical Union , Volume 122: Circumstellar Matter , 1987 , pp. 555 - 556
Copyright
Copyright © Reidel 1987 

References

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Harrington, J.P. 1969, Astrophys. Lett. 3, 165.Google Scholar
Magalhaes, A.M., Coyne, G.V., Codina-Landaberry, S.J., and Gneiding, C. 1986, Astron. Astrophys. 154, 1.Google Scholar