37 citations · 64 across the 6 of their papers we have counts for
5 papers · 1 filter
Spectroscopic confirmation of the binary nature of the hybrid pulsator KIC 5709664 found with the frequency modulation method
A. Derekas, S. J. Murphy, G. Dalya +14
We started a program to search for companions around hybrid Sct/ Dor stars with the frequency modulation method using Kepler data. Our best candidate was KIC 5709664, where…
The [Y/Mg] clock works for evolved solar metallicity stars
D. Slumstrup, F. Grundahl, K. Brogaard +5
Previously [Y/Mg] has been proven to be an age indicator for solar twins. Here, we investigate if this relation also holds for helium-core-burning stars of solar metallicity. High…
An investigation of the formation and line properties of MgH in 3D hydrodynamical model stellar atmospheres
Anders O. Thygesen, Evan N. Kirby, Andrew J. Gallagher +4
Studies of the isotopic composition of magnesium in cool stars have so far relied upon the use of one-dimensional (1D) model atmospheres. Since the isotopic ratios derived are base…
KIC 4768731: a bright long-period roAp star in the Kepler Field
B. Smalley, E. Niemczura, S. J. Murphy +11
We report the identification of 61.45 d^-1 (711.2 mu Hz) oscillations, with amplitudes of 62.6-mu mag, in KIC 4768731 (HD 225914) using Kepler photometry. This relatively bright (V…
Fundamental parameters of red giants in 47 Tucanae
A. O. Thygesen, L. Sbordone
In these proceedings we present initial results of a spectroscopic analysis of a small sample of evolved K-giants in the globular cluster 47 Tucanae. We derive the effective temper…