Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aas...20111507t&link_type=abstract
American Astronomical Society, 201st AAS Meeting, #115.07; Bulletin of the American Astronomical Society, Vol. 34, p.1291
Astronomy and Astrophysics
Astronomy
Scientific paper
As part of the long-term monitoring of Mira variables at the Palomar Testbed Interferometer, we report high-resolution narrowband angular sizes of the oxygen-rich Mira R Bootis The dataset spans five pulsation cycles for a total of 1496 25-sec observations), and represents the second study to correlate multi-epoch narrowband interferometric data of Mira variables. When the calibrated visibility data are fit using a uniform disk brightness model, differences are seen in their angular diameters as a function of wavelength within the K band (2.0 - 2.4 μ m); the source of which are molecular absorptions in or above the photosphere of the oxygen-rich Mira. Using visible photometric data provided by the AFOEV, the continuum minimum size tracks the visual maximum brightness as found in our previous study (Paper I) for the oxygen-rich Mira S Lac. Based on the mean of the continuum angular diameter cycloid, basic stellar parameters are computed for R Boo, with this star showing maximum atmospheric extension with respect to the 2.0 and 2.4 μ m diameters near phase 0.95. Using the mean value of the fitted cycloids, R Boo has a radius Rmean = 217 +/- 40 Rsun and a mean Teff = 2961 +/- 43 K .The dominant source of error in the mean radius is the large uncertainty in the distance to this star. Cyclical differences between wideband and narrowband 2.2 μ m angular diameters are explored, and no evidence for departures from circular symmetry were found.
Creech-Eakman Michelle J.
Thompson Rachel
van Belle Gerard T.
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