Mira variables lose mass which slowly expands into a circumstellar shell surrounding the star. Dust forms in the shell by condensation as the shell cools. The presence of dust in detected by infrared (IR) observations that record the general infrared emission from the cooler dust, as well as by IR spectral scans that detect emission features from the dust. These scans have revealed that the composition of dust in both oxygen- and carbon-rich stars is produced by a larger variety of dust grains than had been anticipated, and that the dust shows variation in phase with the visual light curve.
Journal of the American Association of Variable Star Observers (JAAVSO)
- Pub Date:
- Variable Stars;
- Mira Variables;