Radio photospheres: imaging and light curves

Details Radio photospheres: imaging and light curves Radio photospheres: imaging and light curves

Apr 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003assl..283..283r&link_type=abstract

In: Mass-losing pulsating stars and their circumstellar matter. Workshop, May 13-16, 2002, Sendai, Japan, edited by Y. Nakada, M

Astronomy and Astrophysics

Astrophysics

1

Mira Variables, Light Curves, Shocks, Masers

Scientific paper

Radio continuum observations of a sample oxygen-rich Miras indicate temperatures and densities at radii near 2 R* average ≍1500 K and ~10-12gm cm-3. The nearly constant radio light curves rule out strong shocks in this region, and SiO maser proper motions indicate convective-like motions with speeds of ≍4 km s-1. The large amplitudes of visual light curves can be explained by the variable formation of molecular oxides (i.e., TiO). Simple models can reproduce the visual light curves and these models confirm the densities and low temperatures derived from the radio observations.

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