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Proceedings Paper

Variability in late-type stars' diameters measured using mid-infrared interferometry
Author(s): Jonathon Weiner; David D. Snyder Hale; Charles H. Townes
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Paper 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.

Paper Details

Date Published: 21 February 2003
PDF: 9 pages
Proc. SPIE 4838, Interferometry for Optical Astronomy II, (21 February 2003); doi: 10.1117/12.456783
Show Author Affiliations
Jonathon Weiner, Univ. of California/Berkeley, Space Sciences Lab. (United States)
David D. Snyder Hale, Mt. Wilson Observatory (United States)
Charles H. Townes, Univ. of California/Berkeley, Space Sciences Lab. (United States)

Published in SPIE Proceedings Vol. 4838:
Interferometry for Optical Astronomy II
Wesley A. Traub, Editor(s)

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