102 citations · 189 across the 6 of their papers we have counts for
7 papers
The PHLEK Survey: A New Determination of the Primordial Helium Abundance
Tiffany Hsyu, Ryan J. Cooke, J. Xavier Prochaska +1
We present Keck NIRSPEC and Keck NIRES spectroscopy of sixteen metal-poor galaxies that have pre-existing optical observations. The near-infrared (NIR) spectroscopy specifically ta…
PypeIt: The Python Spectroscopic Data Reduction Pipeline
J. Xavier Prochaska, Joseph F. Hennawi, Kyle B. Westfall +5
PypeIt is a Python package for semi-automated reduction of astronomical, spectroscopic data. Its algorithms build on decades-long development of previous data reduction pipelines b…
Searching for the Lowest Metallicity Galaxies
Tiffany Hsyu, Ryan J. Cooke, J. Xavier Prochaska +1
We report a method of identifying candidate low-metallicity blue compact dwarf galaxies (BCDs) from the Sloan Digital Sky Survey (SDSS) imaging data and present 3-m Lick Observator…
The Little Cub: Discovery of an Extremely Metal-Poor Star-Forming Galaxy in the Local Universe
Tiffany Hsyu, Ryan J. Cooke, J. Xavier Prochaska +1
We report the discovery of the Little Cub, an extremely metal-poor star-forming galaxy in the local Universe, found in the constellation Ursa Major (a.k.a. the Great Bear). We firs…
Discovery and Follow-up Observations of the Young Type Ia Supernova 2016coj
WeiKang Zheng, Alexei V. Filippenko, Jon Mauerhan +39
The Type~Ia supernova (SN~Ia) 2016coj in NGC 4125 (redshift ) was discovered by the Lick Observatory Supernova Search 4.9 days after the fitted first-light time (FFLT;…
The Chemical Composition of Red Giant Branch Stars in the Galactic Globular Clusters NGC 6342 and NGC 6366
Christian I. Johnson, Nelson Caldwell, R. Michael Rich +2
We present radial velocities and chemical abundances for red giant branch stars in the Galactic bulge globular clusters NGC 6342 and NGC 6366. The velocities and abundances are bas…
Light Element Chemistry and the Double Red Giant Branch in the Galactic Globular Cluster NGC 288
Tiffany Hsyu, Christian I. Johnson, Young-Wook Lee +1
The globular cluster NGC 288 was previously reported to exhibit two distinct red giant branches (RGBs) in the narrow-band Calcium (HK) and Strömgren b and y band passes. In order t…