Lines of research: The Milky Way and the Local Group (MWLG)

The Milky Way and the Local Group (MWLG)
  • Publication
    The Tucana dwarf spheroidal galaxy: not such a massive failure after all
    Context. Isolated local group (LG) dwarf galaxies have evolved most or all of their life unaffected by interactions with the large LG spirals and therefore...
  • Publication
    The two metallicity groups of the globular cluster M 22: a chemical perspective
    We present a detailed chemical composition analysis of 35 red giant stars in the globular cluster M 22. High resolution spectra for this study were obtained at...
  • Publication
    The ultracool helium-atmosphere white dwarf companion of PSR J0740+6620?
    We report detection of the likely companion of the binary millisecond pulsar (MSP) J0740+6620 with the Gran Telescopio Canarias in the r' and i' bands. The...
  • Publication
    The Ultraviolet Spectrum and Physical Properties of the Mass Donor Star in HD 226868 = Cygnus X-1
    We present an examination of high-resolution, ultraviolet (UV) spectroscopy from Hubble Space Telescope of the photospheric spectrum of the O-supergiant in the...
  • Publication
    The Undiscovered Ultradiffuse Galaxies of the Local Group
    Ultradiffuse galaxies (UDGs) are attractive candidates to probe cosmological models and test theories of galaxy formation at low masses; however, they are...
  • Publication
    The Updated BaSTI Stellar Evolution Models and Isochrones. I. Solar-scaled Calculations
    We present an updated release of the BaSTI (a Bag of Stellar Tracks and Isochrones) stellar model and isochrone library for a solar-scaled heavy element...
  • Publication
    The Value of the Fine Structure Constant over Cosmological Times
    The optical spectra of objects classified as QSOs in the Sloan Digital Sky Survey Data Release 6 are analyzed with the aim of determining the value of the fine...
  • Publication
    The Vanishing and Appearing Sources during a Century of Observations Project. I. USNO Objects Missing in Modern Sky Surveys and Follow-up Observations of a “Missing Star”
    In this paper we report the current status of a new research program. The primary goal of the “Vanishing and Appearing Sources during a Century of Observations”...
  • Publication
    The VLT FLAMES Survey of Massive Stars: Rotation and Nitrogen Enrichment as the Key to Understanding Massive Star Evolution
    Rotation has become an important element in evolutionary models of massive stars, specifically via the prediction of rotational mixing. Here we study a sample...