An IR view of mass loss in Long Period Variables

Details An IR view of mass loss in Long Period Variables An IR view of mass loss in Long Period Variables

2002-04-09

arxiv.org/abs/astro-ph/0204165v1

Astronomy and Astrophysics

Astrophysics

4 pages, 4 postscript figures, uses Mem. SAIt new mem.cls LaTeX class, to appear in proc. "Convegno Nazionale di Astronomia In

Scientific paper

We have investigated the mass loss processes in Long Period Variables, by combining radiative transfer modeling with mid-IR imaging and spectroscopic observations. We find a correlation between variability type and temporal variations in the mass loss rate. Mira variables are more likely to maintain constant mass loss rates over long period of time. Semiregular and Irregular variables are characterized by frequent interruptions in their mass loss rate, on timescales of ~100 yr. High resolution imaging of individual Long Period Variable sources show departures from spherical symmetry. We present the case of o Cet (Mira), in which the presence of a low mass companion plays an active role in shaping the circumstellar environment.

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