Journal: The Astrophysical Journal

  • Publication
    Chemical Composition of Two Bright, Extremely Metal-poor Stars from the SDSS MARVELS Pre-survey
    SDSS J082625.70+612515.10 (V = 11.4 [Fe/H] = ‑3.1) and SDSS J134144.60+474128.90 (V = 12.4 [Fe/H] = ‑3.2) were observed with the SDSS 2.5m telescope as part of...
  • Publication
    Chemical Compositions of Field and Globular Cluster RR Lyrae Stars. I. NGC 3201
    We present a detailed spectroscopic analysis of horizontal branch stars in the globular cluster NGC 3201. We collected optical (4580–5330 Å), high-resolution (...
  • Publication
    Chemical Compositions of Field and Globular Cluster RR Lyrae Stars. II. ω Centauri
    We present a detailed spectroscopic analysis of RR Lyrae (RRL) variables in the globular cluster NGC 5139 (ω Cen). We collected optical (4580–5330 Å), high...
  • Publication
    Chemical Evolution in the Milky Way: Rotation-based Ages for APOGEE-Kepler Cool Dwarf Stars
    We use models of stellar angular momentum evolution to determine ages for ∼500 stars in the APOGEE-Kepler Cool Dwarfs sample. We focus on lower-main-sequence...
  • Publication
    Chemical Tagging in the SDSS-III/APOGEE Survey: New Identifications of Halo Stars with Globular Cluster Origins
    We present new identifications of five red giant stars in the Galactic halo with chemical abundance patterns that indicate they originally formed in globular...
  • Publication
    Chemodynamically Characterizing the Jhelum Stellar Stream with APOGEE-2
    We present the kinematic and chemical profiles of red giant stars observed by the Apache Point Observatory Galactic Evolution Experiment (APOGEE)-2 survey in...
  • Publication
    Chromospheric Diagnosis with Ca II Lines: Forward Modeling in Forward Scattering. I
    This paper presents a synthetic tomography of the quiet solar chromosphere formed by spatial maps of scattering polarization. It has been calculated for the Ca...
  • Publication
    Chromospheric Magnetic Field: A Comparison of He I 10830 Å Observations with Nonlinear Force-free Field Extrapolation
    The nonlinear force-free field (NLFFF) modeling has been extensively used to infer the three-dimensional magnetic field in the solar corona. One of the...
  • Publication
    Chromospheric Modeling of the Active M3V Star G 80–21 with RH1.5D
    This study investigates the active regions of the M3.0V star G 80–21 using the observed data from the CARMENES project with synthetic spectra generated by the...