Physics
Scientific paper
Dec 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002phdt.......169w&link_type=abstract
ProQuest Dissertations And Theses; Thesis (Ph.D.)--University of California, Berkeley, 2002.; Publication Number: AAT3183874; IS
Physics
3
Scientific paper
The size and variability of the photospheres of several late-type stars has been probed using 11 mum heterodyne interferometry. High resolution observations performed during the years 1999--2001 yielded diameter measurements accurate to about 1% for a variety of stars of the supergiant and mira variable types. Using narrow bandwidths (≈0.2 cm-1) to avoid spectral lines, visibilities were measured for the stars alpha Her, chi Cyg, alpha Ori, o Cet, and R Leo. On the latter three stars, observations were made at several different wavelengths, in some cases overlapping an observed spectral feature. In all cases, the 11 mum sizes are larger than previously measured visible and near-infrared diameters. The discrepancies will be addressed. In addition, a variation of the diameter of o Cet (Mira) with phase has been observed.
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