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A search for solar-like oscillations and granulation in alpha Cen A
H. Kjeldsen, T. R. Bedding, S. Frandsen +1
We report the most sensitive search yet made for solar-like oscillations. We observed the star alpha Cen A in Balmer-line equivalent widths over six nights with both the 3.9m Anglo…
Spectroscopy of the roAp star Alpha-Cir -- II. The bisector and equivalent-width of the H-alpha line
I. K. Baldry, M. Viskum, T. R. Bedding +2
We present bisector measurements of the H-alpha line of the rapidly oscillating Ap (roAp) star, Alpha-Cir, obtained from dual-site observations with medium-dispersion spectrographs…
Interferometry and spectroscopy of Beta Cen: a Beta Cephei star in a binary system
J. G. Robertson, T. R. Bedding, C. Aerts +3
Beta Cen is a bright Beta Cephei variable and has long been suspected to be a binary. Here we report interferometric observations with the 3.9-m Anglo-Australian Telescope at a sin…
Mode switching in the nearby Mira-like variable R Doradus
T. R. Bedding, A. A. Zijlstra, A. Jones +1
We discuss visual observations spanning nearly 70 years of the nearby semiregular variable R Doradus. Using wavelet analysis, we show that the star switches back and forth between…
Hipparcos period-luminosity relations for Miras and semiregular variables
T. R. Bedding, A. A. Zijlstra
We present period-luminosity diagrams for nearby Miras and semiregulars, selecting stars with parallaxes better than 20 per cent and well-determined periods. Using K-band magnitude…
Oscillation mode identifications and models for the delta Scuti star FG Virginis
M. Viskum, H. Kjeldsen, T. R. Bedding +4
We present new spectroscopic and photometric time series observations of the delta Scuti star FG~Vir. We detect the oscillations via changes in the equivalent widths of hydrogen an…