206 citations · 260 across the 4 of their papers we have counts for
9 papers
Accounting for Convective Blue-Shifts in the Determination of Absolute Stellar Radial Velocities
C. Allende Prieto, L. Koesterke, I. Ramirez +2
For late-type non-active stars, gravitational redshifts and convective blueshifts are the main source of biases in the determination of radial velocities. If ignored, these effects…
HD 91669b: A New Brown Dwarf Candidate from the McDonald Observatory Planet Search
Robert A. Wittenmyer, Michael Endl, William D. Cochran +4
We report the detection of a candidate brown dwarf orbiting the metal-rich K dwarf HD 91669, based on radial-velocity data from the McDonald Observatory Planet Search. HD 91669b is…
Oxygen Abundances in Nearby Stars. Clues to the formation and evolution of the Galactic disk
I. Ramirez, C. Allende Prieto, D. L. Lambert
The abundances of iron and oxygen are homogeneously determined in a sample of 523 nearby (d<150 pc) FGK disk and halo stars with metallicities in the range -1.5<[Fe/H]<0.5. The oxy…
Fundamental Parameters and Abundances of Metal-Poor Stars: The SDSS Standard BD +17 4708
I. Ramirez, C. Allende Prieto, S. Redfield +1
The atmospheric parameters and iron abundance of the Sloan Digital Sky Survey (SDSS) spectrophotometric standard star BD +17 4708 are critically examined using up-to-date Kurucz mo…
Oxygen in Galactic Disk Stars: non-LTE abundances from the 777 nm O I triplet
I. Ramirez, C. Allende Prieto, D. L. Lambert
Oxygen abundances for a large sample of dwarf and giant stars kinematically selected to be part of the Galactic thin and thick disks have been determined from a non-LTE analysis of…
Reappraising the Spite Lithium Plateau: Extremely Thin and Marginally Consistent with WMAP
Jorge Melendez, Ivan Ramirez
The lithium abundance in 62 halo dwarfs is determined from accurate equivalent widths reported in the literature and an improved infrared flux method (IRFM) temperature scale. The…