Science with the Virtual Observatory

Terabytes of data are stored in archives that need to be described, indexed and federated in a uniform way to ensure their interoperability and a maximum scientific return. Thanks to their proximity, their various stellar populations, and their nature of galactic systems, the Magellanic Clouds are ideal testbeds for the Virtual Observatory.
  • At CDS

    Partly supported by the European ASTROVIRTEL program, I cross-matched the near-infrared DENIS and 2MASS point sources towards the Magellanic Clouds. The cross-correlation procedure is being extended to other wavelength ranges: far-infrared, optical, X-ray...

    The aim is to build a reference catalogue of stars based on multiwavelength cross-identification of several astronomical catalogues. It provides an unprecedented basis for the study of stellar populations in the Magellanic Clouds. More about this Master Catalogue of stars towards the Magellanic Clouds (MC2) can be found at

    The Magellanic Clouds are two galaxies located in the Southern Skies. They look like two hazy patches of light to the naked eye and have no counterparts in the Northern Hemisphere, which make them so astonishing to the Northern observer...
    Just click on the right-side image to see them better!
  • At ESO

    I am calibrating the properties of massive stars in the near-infrared on Galactic structure purposes.
    Because they are intrisically very luminous, they have been traced in nearby galaxies to be used as distance indicators. They play a key role in the understanding of the cosmological evolution of the Universe: the better their stellar properties are understood, the better their contribution to the luminosity of high-redshifted galaxies can be estimated.

    Furthermore, massive stars are an essential part of the galactic evolution process though their lifetime (107yr) is negligible at a galactic timescale. Through their stellar winds during lifetime and at death when they explode into supernovae, they release not only a lot of kinetic energy into the interstellar medium but also the heaviest elements of the Galaxy which are created deep in their center, contributing to its enrichment in metallicity.
    Massive stars are often found in HII regions where they ionize the surrounding gas, creating beautiful starforming nebulae.
    Pictures of such regions may be found here and there.
    I started a study on such HII regions in the Large Magellanic Cloud to gain insight in the local star formation history.