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usic:infrared_spatial_interferometer_isi [2018/07/08 21:05]
jones
usic:infrared_spatial_interferometer_isi [2018/07/08 21:05]
jones
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 ====== Infrared Spatial Interferometer (ISI)  ====== ====== Infrared Spatial Interferometer (ISI)  ======
-{{usic:files:ISI.Usic.jpg|_ISI.Usic.jpg}}+{{usic:files:ISI.Usic.jpg|_ISI.Usic.jpg}}\\
 **Infrared Spatial Interferometer** ([[http://isi.ssl.berkeley.edu/|ISI]]) **Infrared Spatial Interferometer** ([[http://isi.ssl.berkeley.edu/|ISI]])
 \\  Operating in the mid-IR, ISI studies **circumstellar dust around** evolved stars and finds that half emit dust episodically in outbursts separated by decades or centuries. These include aOri, a Sco, and a Her, with dust at a mean distance of 38 R*, and Mira variables, with dust at < 6 R•. ISI is now monitoring some 30 stars for changes in their surrounding dust from which the stellar distances can be found.\\ \\  ISI found the **diameter of Mira** to be 47.8 ± 0.5 mas, at pulsation phase 0.9, substantially larger than previously expected, with a systematic variation of ±13% over its ~ 330 day period. With its three telescopes, ISI can measure “closure phase” to check for departures from circular symmetry. While such stars as a Her and a Sco were found to be symmetric sources, at least seven Miras show varying degrees of asymmetry.\\ \\  \\  Operating in the mid-IR, ISI studies **circumstellar dust around** evolved stars and finds that half emit dust episodically in outbursts separated by decades or centuries. These include aOri, a Sco, and a Her, with dust at a mean distance of 38 R*, and Mira variables, with dust at < 6 R•. ISI is now monitoring some 30 stars for changes in their surrounding dust from which the stellar distances can be found.\\ \\  ISI found the **diameter of Mira** to be 47.8 ± 0.5 mas, at pulsation phase 0.9, substantially larger than previously expected, with a systematic variation of ±13% over its ~ 330 day period. With its three telescopes, ISI can measure “closure phase” to check for departures from circular symmetry. While such stars as a Her and a Sco were found to be symmetric sources, at least seven Miras show varying degrees of asymmetry.\\ \\ 
usic/infrared_spatial_interferometer_isi.txt · Last modified: 2018/07/08 21:05 by jones