David Tytler
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View article: Hamilton Echelle Spectrograph Observations of Solar Analog Field Stars: Lithium Abundance and Activity
Hamilton Echelle Spectrograph Observations of Solar Analog Field Stars: Lithium Abundance and Activity Open
We measured lithium (Li) abundance and instantaneous chromospheric Ca ii HK activity in Hamilton Echelle Spectrograph observations of 211 solar analog field stars, with one objective being potential identification of grand minimum candidat…
View article: Standard-Model Extension Constraints on Lorentz and CPT Violation from Optical Polarimetry of Active Galactic Nuclei
Standard-Model Extension Constraints on Lorentz and CPT Violation from Optical Polarimetry of Active Galactic Nuclei Open
Vacuum birefringence from Lorentz and CPT violation in the Standard-Model Extension can be constrained using ground-based optical polarimetry of extragalactic sources. We describe results from a pilot program with an automated system that …
View article: Power spectrum of the flux in the Lyman-alpha forest from high-resolution spectra of 87 QSOs
Power spectrum of the flux in the Lyman-alpha forest from high-resolution spectra of 87 QSOs Open
We measure and calibrate the power spectrum of the flux in the Ly α forest at 1.8 < z < 4.6 for wavenumbers 0.003 ≤ k ≤ 0.1 s km−1 from the spectra of 87 QSOs obtained with HIRES on the Keck-I telescope. This is the largest sample us…