Astrophysical: Chromospheres

  • Publication
    Magnetic activities on two single-lined RS Canum Venaticorum binaries IM Pegasi and σ Geminorum
    We present the study on continuous high-resolution spectroscopic observations of two long-period single-lined RS Canum Venaticorum (RS CVn) binary stars IM...
  • Publication
    Magnetic activity of red giants: Correlation between the amplitude of solar-like oscillations and chromospheric indicators
    Previous studies have found that red giants (RGs) in close binary systems undergoing spin-orbit resonance exhibit an enhanced level of magnetic activity with...
  • Publication
    Mass Outflow and Chromospheric Activity of Red Giant Stars in Globular Clusters. II. M13 and M92
    High-resolution spectra of 123 red giant stars in the globular cluster M13 and 64 red giant stars in M92 were obtained with Hectochelle at the MMT telescope...
  • Publication
    Mass Outflow and Chromospheric Activity of Red Giant Stars in Globular Clusters.I. M15
    High-resolution spectra of 110 selected red giant stars in the globular cluster M15 (NGC 7078) were obtained with Hectochelle at the MMT telescope in 2005 May...
  • Publication
    Mass Outflow from Red Giant Stars in M13, M15, and M92
    Chromospheric model calculations of the Hα line for selected red giant branch and asymptotic giant branch (AGB) stars in the globular clusters M13, M15, and M92...
  • Publication
    Non-LTE Inversion of Line Profiles
    In this paper we address the problem of the non-LTE (NLTE) inversion of line profiles by means of a nonlinear least-squares minimization procedure combined with...
  • Publication
    Non-LTE Inversion of Stokes Profiles Induced by the Zeeman Effect
    This paper presents a new diagnostic tool for the inference of the thermal, dynamic, and magnetic properties of the solar chromosphere. It consists of a non-LTE...
  • Publication
    Observation and modelling of main-sequence star chromospheres - XIX. FIES and FEROS observations of dM1 stars
    We present 187 high-resolution spectra for 62 different M1 dwarfs from observations obtained with the FIbre-fed Echelle Spectrograph (FIES) on the Nordic...
  • Publication
    Polarisation and magnetic fields in cool stars and the Sun. A session in memory of Meir Semel
    Astrophysical plasmas and magnetic fields are inextricably coupled to each other. But magnetic fields are elusive; they cannot be fully characterized with...