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| Paper: |
Mid-Infrared Spatial Interferometry on Late-Type Stars and Their Circumstellar Material |
| Volume: |
135, A Half Century of Stellar Pulsation Interpretations: a Tribute to Arthur N. Cox |
| Page: |
316 |
| Authors: |
Townes, C. H.; Bester, M.; Danchi, W.; Hale, D.; Lipman, E.; Monnier, J.; Tuthill, P. |
| Abstract: |
A two-telescope interferometer of variable baseline has been constructed by the Berkeley Infrared Spatial Interferometer group to measure visibility curves of stars in the 10 micron region. Results are combined with spectroscopic and luminosity measurements. Mid-IR interferometry is particularly suited to examining the distribution of dust clouds emitted by late-type stars, and also stellar diameters since the effects of limb-darkenening and stellar hot spots are small. Results show the location of initial dust formation, the distribution of emitted material and in some cases its motion, the average rates of emitted material, and the relation between circumstellar clouds and masers. A substantial fraction of the 15 stars studied have major dust emission eposides separated by 10-100 years; others emit continuously or on each luminosity cycle. Recent emissions of IRC+10216, a Ori, o Ceti, NML Cyg, and NML Tau are a few cases which have been studied in some detail. |
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