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Meredith L. Rawls edited abstract.tex
almost 9 years ago
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%\begin{abstract}
We combine \emph{Kepler} photometry with ground-based radial velocities to present a comprehensive photodynamical model for the double red giant eclipsing binary KIC 9246715. The two stars are nearly identical in mass ($M_1 = 2.16 \pm 0.04\ M_{\odot}$, $M_2 = 2.14 \pm 0.03\
M_{\odot}$), M_{\odot}$) and radius ($R_1 = 7.90 \pm 0.04 \ R_{\odot}$, $R_2 = 8.33 \pm 0.04 \
R_{\odot}$), and surface gravity (PUT SURFACE GRAVITIES HERE) R_{\odot}$) in a well-separated and eccentric ($e = 0.35$) 171-day orbit, yet an asteroseismic analysis identifies only a single set of solar-like oscillations. The oscillation amplitudes are weaker than expected from similar red giants. Because the two stars are nearly twins, KIC 9246715 is not a good target for precisely testing the asteroseismic scaling relations---both stars are consistent with the single inferred
mass, radius, mass and
surface gravity radius ($M_{\rm{seismo}} =
2.06 2.21 \pm 0.13 \ M_{\odot}$, $R_{\rm{seismo}} =
8.10 8.30 \pm
0.18 0.16 \ R_{\odot}$,
PUT SEISMIC LOG G HERE). $\log g = 2.944 \pm 0.007$). EDIT THIS TO SAY STAR 2 IS PROBABLY THE OSCILLATOR BUT WE CAN'T SAY FOR SURE. We suspect stellar activity or modest tidal forces are responsible for a lack of solar-like oscillations in one star and weak oscillations in the other. We further show that KIC 9246715 is a coeval binary with both stars in the Helium-core-burning red clump. This system is a useful asteroseismic case study and paves the way for a detailed analysis of more red giants in eclipsing binaries.
%\end{abstract}