Astrophysical: Stellar dynamics

  • Publication
    Globular clusters in modified Newtonian dynamics: velocity dispersion profiles from self-consistent models
    We test the modified Newtonian dynamics (MOND) theory with the velocity dispersion profiles of Galactic globular clusters populating the outermost region of the...
  • Publication
    High-Resolution Spectroscopy of the Yellow Hypergiant ρ Cassiopeiae from 1993 through the Outburst of 2000-2001
    We present an overview of the spectral variability of the peculiar F-type hypergiant ρ Cas, obtained from our long-term monitoring campaigns over the past 8.5...
  • Talk
    IAU G5 -- The GALAH survey: science goals and highlights to date
    The field of Galactic archaeology has been very active in recent years, with a major influx of data from the Gaia satellite and large spectroscopic surveys. The...
  • Talk
    IAU G5 Talk: Winds of Magnetic Massive Stars
    Massive stars (at least eight times as massive as the Sun) possess strong stellar winds driven by radiation. With the advent of the so called MiMeS...
  • Talk
    IAU G5: "Extreme Precision Stellar Spectroscopy"
    The new generation of spectrometers designed for extreme precision radial velocities enable correspondingly precise stellar spectroscopy. It is now fruitful to...
  • Publication
    Intracluster Stellar Population Properties from N-Body Cosmological Simulations. I. Constraints at z = 0
    We use a high-resolution collisionless simulation of a Virgo-like cluster in a ΛCDM cosmology to determine the velocity and clustering properties of the diffuse...
  • Talk
    Mapping the Sun's upper photosphere with artificial neural networks
    In this talk I'll present results from a recent paper in which we have developed a new analysis technique for solar spectra based on artificial neural networks...
  • Publication
    Modeling Tidal Streams in Evolving Dark Matter Halos
    We explore whether stellar tidal streams can provide information on the secular, cosmological evolution of the Milky Way's gravitational potential and on the...
  • Publication
    On the infant weight loss of low- to intermediate-mass star clusters
    Star clusters are born in a highly compact configuration, typically with radii of less than about 1 pc roughly independently of mass. Since the star formation...