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Wavelength dependence of angular diameters of M giants: an observational perspective
A. P. Jacob, T. R. Bedding, J. G. Robertson +1
We discuss the wavelength dependence of angular diameters of M giants from an observational perspective. Observers cannot directly measure an optical-depth radius for a star, despi…
Time-series Spectroscopy of EC14026 Stars: Preliminary Results
Simon J. O'Toole, Teresa C. Teixeira, Timothy R. Bedding +1
We have obtained time-series spectra for the pulsating hot subdwarf (sdB) PG1605+072. Previous time-series photometry of this star has shown maximum amplitude variations of about 0…
Studies of Mira and semiregular variables using visual databases
T. R. Bedding, B. C. Conn, A. A. Zijlstra
We use wavelets to investigate period and amplitude changes in Mira and semiregular variables and found a variety of behaviours. Period and amplitude changes often go together, per…
New methods for masked-aperture and speckle interferometry
Timothy R. Bedding
Diffraction-limited images can be obtained with a large optical telescope using interferometry. One such method for objects of sufficient brightness is non-redundant masking (NRM),…