Astrophysical: Coronae

  • Publication
    Evidence of the FIP Effect in the Coronae of Late-Type Giants
    The stars β Cet, 31 Com, and μ Vel represent the main stages through which late-type giants evolve during their lifetime (the Hertzsprung gap [31 Com], the...
  • Publication
    Geometry Diagnostics of a Stellar Flare from Fluorescent X-Rays
    We present evidence of Fe fluorescent emission in the Chandra HETGS spectrum of the single G-type giant HR 9024 during a large flare. In analogy to solar X-ray...
  • Publication
    Stellar Coronal Abundances at Intermediate-Activity Levels: ξ UMa
    We present an analysis of Chandra High Energy Transmission Grating (HETG) spectra of the corona of the critical intermediate-activity, quadruple stellar system...
  • Publication
    Synthetic polarimetric spectra from stellar prominences
    Stellar prominences detected in rapidly rotating stars serve as probes of the magnetism in the corona of cool stars. We have synthesized the temporal evolution...
  • Publication
    The Coronae of AB Doradus and V471 Tauri: Primordial Angular Momentum versus Tidal Spin-up
    The zero-age main-sequence star AB Dor and the K dwarf component of the V471 Tau close binary have essentially identical rotation rates and spectral types. An...
  • Publication
    X-exoplanets: an X-ray and EUV database for exoplanets
    Extreme Ultraviolet (EUV) and X-ray emission is of great importance in several phenomena related to the formation of planetary systems and the atmospheres of...
  • Publication
    X-Ray Evidence for a Pole-dominated Corona on AB Dor
    A fine analysis of spectral line widths and Doppler shifts employing Fourier transform and cross-correlation techniques has been applied to Chandra HETG spectra...
  • Publication
    X-Ray Flaring on the dMe Star, Ross 154
    We present results from two Chandra imaging observations of Ross 154, a nearby flaring M dwarf star. During a 61 ks ACIS-S exposure, a very large flare occurred...