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Subaru and Swift observations of V652 Herculis: resolving the photospheric pulsation
C. S. Jeffery, D. Kurtz, H. Shibahashi +4
High resolution spectroscopy with the Subaru High Dispersion Spectrograph, and Swift ultraviolet photometry are presented for the pulsating extreme helium star V652\,Her. Swift pro…
A search for non-pulsating, chemically normal stars in the Scuti instability strip using Kepler data
Simon J. Murphy, Timothy R. Bedding, Ewa Niemczura +2
We identify stars in the Sct instability strip that do not pulsate in p modes at the 50-mag limit, using Kepler data. Spectral classification and abundance analyses from hig…
Asteroseismic measurement of slow, nearly-uniform surface-to-core rotation in the main sequence F star KIC 9244992
Hideyuki Saio, Donald W. Kurtz, Masao Takata +4
We have found a rotationally split series of core g-mode triplets and surface p-mode multiplets in a main sequence F star, KIC 9244992. Comparison with models shows that the star h…
Kepler photometry of RRc stars: peculiar double-mode pulsations and period doubling
P. Moskalik, R. Smolec, K. Kolenberg +11
We present the analysis of four first overtone RR Lyrae stars observed with the Kepler space telescope, based on data obtained over nearly 2.5yr. All four stars are found to be mul…
Short time-scale frequency and amplitude variations in the pulsations of an roAp star: HD 217522
Rodney Medupe, Donald Wayne Kurtz, Vladimir Elkin +2
Photometric observations of HD~217522 in 1981 revealed only one pulsation frequency ~mHz. Subsequent observations in 1989 showed the presence of an additional frequenc…
Time resolved spectroscopy of the cool Ap star HD 213637
V. G. Elkin, D. W. Kurtz, G. Mathys
We present an analysis of high time resolution spectra of the chemically peculiar Ap star HD 213637. The star shows rapid radial velocity variations with a period close to the phot…