Spectral angular diameters of Mira variables using long- baseline near-infrared interferometry

Details Spectral angular diameters of Mira variables using long- baseline near-infrared interferometry Spectral angular diameters of Mira variables using long- baseline near-infrared interferometry

Nov 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002phdt........10t&link_type=abstract

Thesis (PhD). UNIVERSITY OF WYOMING, Source DAI-B 63/05, p. 2425, Nov 2002, 232 pages.

Computer Science

4

Scientific paper

This dissertation (i)reviews the capabilities of the Palomar Testbed Interferometer (PTI), and (ii)the use of PTI to investigate angular diameters of Mira variables stars within narrow spectral bands in the near-infrared as a function of pulsational phase. PTI is a three-aperture Michelson stellar interferometer with two non-simultaneous baselines with sensitivity to resolved sources with angular diameters in the range of 1.0 6.0 milliarcseconds. In preparation for this disseration, over 60 Mira variables were observed for a total of 12,000 wavelength-dependent angular diameters. Diameters of non-Mira control stars were also measured, and are compared to the extended atmospheres of their chemical counterparts. It is established that the oxygen- rich and carbonrich Miras behave differently with respect to their phase-dependent diameters, as evidenced in the near-infrared narrowband channels, and is a result of the differing molecular makeup of their outer atmospheres. Effective temperatures and linear sizes are established, and evidence for departures from spherical symmetry are reported. The data contained herein will be useful to in verifying theoretical limb-darkening laws and pulsation modes for these highly evolved and enigmatic stars.

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