Journal: Astronomy and Astrophysics

  • Publication
    A broadband X-ray view of the ultraluminous sources in the galaxies ESO 501–023 and IC 5052
    We report the results obtained from the analysis of XMM-Newton and NuSTAR observations of two ultraluminous X-ray sources (ULXs) located in the galaxies ESO 501...
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    A calibration of the Rossby number from asteroseismology
    Stellar activity and rotation are tightly related in a dynamo process. Our understanding of this mechanism is mainly limited by our capability of inferring the...
  • Publication
    A candidate short-period sub-Earth orbiting Proxima Centauri
    Context. Proxima Centauri is the closest star to the Sun. This small, low-mass, mid M dwarf is known to host an Earth-mass exoplanet with an orbital period of...
  • Publication
    A case against an X-shaped structure in the Milky Way young bulge
    Context. A number of recent papers have claimed the discovery of an X-shape structure in the bulge of our Galaxy in the population of the red clumps. Aims: We...
  • Publication
    A catalog of warps in spiral and lenticular galaxies in the Southern hemisphere
    A catalog of optical warps of galaxies is presented. This can be considered complementary to that reported by Sánchez-Saavedra et al. (cite{sanchez-saavedra})...
  • Publication
    A CCD imaging search for wide metal-poor binaries
    We explored the regions within a radius of 25 arcsec around 473 nearby, low-metallicity G- to M-type stars using (VR)I optical filters and small-aperture...
  • Publication
    A census of massive stars in NGC 346. Stellar parameters and rotational velocities
    Spectroscopy for 247 stars towards the young cluster NGC 346 in the Small Magellanic Cloud has been combined with that for 116 targets from the VLT-FLAMES...
  • Publication
    A census of OBe stars in nearby metal-poor dwarf galaxies reveals a high fraction of extreme rotators
    The early Universe, together with many nearby dwarf galaxies, is deficient in heavy elements. The evolution of massive stars in such environments is thought to...
  • Publication
    A census of very-low-mass stars and brown dwarfs in the σ Orionis cluster
    Context: The knowledge of the initial mass function (IMF) in open clusters constitutes one way of constraining the formation of low-mass stars and brown dwarfs...