Variability in late-type stars' diameters measured using mid-infrared interferometry

Jonathon Weiner; David D. Snyder Hale; Charles H. Townes

doi:10.1117/12.456783

21 February 2003 The variability of late-type stars' diameters measured using mid-infrared interferometry

Jonathon Weiner, David D. Snyder Hale, Charles H. Townes

Proceedings Volume 4838, Interferometry for Optical Astronomy II; (2003) https://doi.org/10.1117/12.456783
Event: Astronomical Telescopes and Instrumentation, 2002, Waikoloa, Hawai'i, United States

Abstract

The size and variability of the photospheres of several late-type stars has been probed using 11 micron heterodyne interferometry. High resolution observations performed during the years 1999 - 2001 yielded diameter measurements accurate to about 1% for α Ori and o Cet, an supergiant and a mira variable. Narrow bandwidths (0.17 cm^-1) and high resolution spectra were used to avoid molecular lines. Observations were made at several different wavelengths, sometimes purposely overlapping an observed spectral feature. In all cases, the 11 micron sizes are larger than previously measured visible and near-infrared diameters. The discrepancies will be discussed. In addition, a variation of the diameter of Mira with phase has been observed.

Citation Download Citation

Jonathon Weiner, David D. Snyder Hale, and Charles H. Townes "The variability of late-type stars' diameters measured using mid-infrared interferometry", Proc. SPIE 4838, Interferometry for Optical Astronomy II, (21 February 2003); https://doi.org/10.1117/12.456783

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