Katherine R. Summers

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The REC104 gene of Saccharomyces cerevisiae is required to initiate recombination in meiosis. Mutations in REC104 eliminate meiotic recombination and lead to the production of inviable spores. To determine if analogous genes exist in other yeasts, clones that hybridized to a REC104 probe were isolated from the yeasts S.␣paradoxus and S.␣pastorianus. When(More)
We present the first science results from the Keck Interferometer, a direct-detection infrared interferometer utilizing the two 10-meter Keck telescopes. The instrument and system components are briefly described. We then present observations of the T Tauri object DG Tau, which is resolved by the interferometer. The resolved component has a radius of 0.12(More)
We describe the Keck Interferometer nuller theory of operation, data reduction, and on-sky performance, particularly as it applies to the nuller exozodiacal dust key science program that was carried out between 2008 February and 2009 January. We review the nuller implementation, including the detailed phasor processing involved in implementing the null-peak(More)
The Keck Interferometer (KI) combines the two 10m diameter Keck telescopes providing milliarcsecond angular resolution. KI has unique observing capabilities such as sensitive K-band V, L-band V and N-band nulling modes. The instrument improvements and status of the Keck Interferometer since the 2010 SPIE meeting are summarized. We discuss the current(More)
As part of the astrometric and phase-referenced astronomy (ASTRA) project, three new science modes are being developed for the Keck Interferometer that extend the science capabilities of this instrument to include higher spectral resolution, fainter magnitudes, and astrometry. We report on the successful implementation of the first of these science modes,(More)
Using a new grism at the Keck Interferometer, we obtained spectrally dispersed ( ) interferometric R ∼ 230 measurements of the Mira star R Vir. These data show that the measured radius of the emission varies substantially from 2.0 to 2.4 mm. Simple models can reproduce these wavelength-dependent variations using extended molecular layers, which absorb(More)
The Keck Interferometer (KI) combined the two 10 m W. M. Keck Observatory telescopes on Mauna Kea, Hawaii, as a long-baseline nearand mid-infrared interferometer. Funded by NASA, it operated from 2001 until 2012. KI used adaptive optics on the two Keck telescopes to correct the individual wavefronts, as well as active fringe tracking in all modes for(More)
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