306 citations · 2.2k across the 36 of their papers we have counts for
36 papers
Nancy Grace Roman Space Telescope Coronagraph Instrument Observation Calibration Plan
Robert T. Zellem, Bijan Nemati, Guillermo Gonzalez +20
NASA's next flagship mission, the Nancy Grace Roman Space Telescope, is a 2.4-meter observatory set to launch no later than May 2027. Roman features two instruments: the Wide Field…
Constraining Delta-T from Babylonian Lunar Appulse and Occultation Observations
Guillermo Gonzalez
We examine in detail 15 Babylonian observations of lunar appulses and occultations made between 80 and 419 BC for the purpose of setting useful limits on Earth's clock error, as qu…
A Revised Gyro-Age for M 67 from Kepler/K2-Campaign-5 Light Curves
Guillermo Gonzalez
We revisit the photometric variability of stars in the M 67 field using Kepler/K2-Campaign-5 light curves. In our previous work, we limited the search area around M\,67 to that of…
Variability Among Stars in the M 67 Field from Kepler/K2-Campaign-5 Light Curves
Guillermo Gonzalez
We examine the photometric variability of stars in the M 67 field using Kepler/K2-Campaign-5 light curves. Variabilities and periods were determined for 639 stars. The mean photome…
Parent Stars of Extrasolar Planets. XV. Host Star Rotation Revisited with {\it Kepler} Data
Guillermo Gonzalez
We employed published rotation periods of {\it Kepler} field stars to test whether stars hosting planets tend to rotate more slowly than stars without known planets. Spectroscopic…
Parent Stars of Extrasolar Planets - XIV. Strong Evidence of Li Abundance Deficit
Guillermo Gonzalez
We report the results of our analysis of new high resolution spectra of 30 late-F to early-G dwarf field stars for the purpose of deriving their Li abundances. They were selected f…