POSTER PAPER 9.03
Pulsation Modes of Mira Variables Investigated Using NIR Interferometry
M. J. Creech-Eakman, R. R. Thompson
Institute: California Institute of Technology, Jet Propulsion Lab
Institute: University of Wyoming, Dept. of Physics and Astronomy
Contact Email: mce@huey.jpl.nasa.gov
Abstract:
We have undertaken a program (1999 to present) with the Palomar Testbed Interferometer to
measure the angular size variations, with respect to pulsational phase, of a group of about
50 mira variables, approximately 30 of which are M-types. While we have unambiguously
detected the pulsation of the miras with phase (Creech-Eakman et al. 1999 and Thompson
et al. 2001), our main goal with this study is to determine through direct detection
methods whether mira variables pulsate in the fundamental or first-overtone mode. To
this end, we use our angular diameter measurements with the best estimates of stellar distances
to determine if a particular pulsation mode can be identified for the oxygen-rich stars
in our sample.
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Manuscript submitted: 2001-Sep-14
"The Future of Cool-Star Astrophysics", 2003, Eds. A. Brown,
G. M. Harper, & T. R. Ayres.
Proceedings of 12th Cambridge Workshop on Cool Stars, Stellar Systems,
& The Sun,
© 2003 University of Colorado.