Journal: The Astrophysical Journal

  • Publication
    The Unusual 2001 Periastron Passage in the ``Clockwork'' Colliding-Wind Binary WR 140
    We follow, using both optical spectroscopy and photometry, the ``textbook'' colliding-wind WR+O binary WR 140 through and between the periastron passages of...
  • 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 Variable Radio-to-X-Ray Spectrum of the Magnetar XTE J1810-197
    We have observed the 5.54 s anomalous X-ray pulsar XTE J1810-197 at radio, millimeter, and infrared (IR) wavelengths, with the aim of learning about its...
  • Publication
    The Variation of Integrated Star Initial Mass Functions among Galaxies
    The integrated galaxial initial mass function (IGIMF) is the relevant distribution function containing the information on the distribution of stellar remnants...
  • Publication
    The Vertical Metallicity Gradient of the Milky Way Disk: Transitions in [α/Fe] Populations
    Using G dwarfs from the Sloan Extension for Galactic Understanding and Exploration (SEGUE) survey, we have determined the vertical metallicity gradient in the...
  • Publication
    The Very Red Afterglow of GRB 000418: Further Evidence for Dust Extinction in a Gamma-Ray Burst Host Galaxy
    We report near-infrared and optical follow-up observations of the afterglow of the GRB 000418 starting 2.5 days after the occurrence of the burst and extending...
  • Publication
    The Virgo Stellar Overdensity: Mapping the Infall of the Sagittarius Tidal Stream onto the Milky Way Disk
    The recently discovered Virgo stellar overdensity, which extends over ~1000 deg2 perpendicular to the Galactic disk plane (7 kpc
  • 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...