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Our goal is to perform in-depth ensemble asteroseismology of the young opencluster NGC2244 with the 2-wheel Kepler mission. While the nominal Keplermission already implied a revolution in stellar physics for solar-type starsand red giants, it was not possible to perform asteroseismic studies of massiveOB stars because such targets were carefully avoided in the FoV in order not todisturb the exoplanet hunting. Now is an excellent time to fill this hole inmission capacity and to focus on the metal factories of the Universe, for whichstellar evolution theory is least adequate.  Our white paper aims to remedy major shortcomings in the theory of stellarstructure and evolution of the most massive stars by focusing on a largeensemble of stars in a carefully selected young open cluster. Clusterasteroseismology of very young stars such as those of NGC2244 has the majoradvantage that all cluster stars have similar age, distance and initialchemical composition, implying drastic restrictions for the stellar modelingcompared to asteroseismology of single isolated stars with very different agesand metallicities.  Our study requires long-term photometric measurements of stars with visualmagnitude ranging from 6.5 to 15 in a large FoV with a precision better than 30ppm for the brightest cluster members (magnitude below 9) up to 500 ppm for thefainter ones, which is well achievable with 2-Wheel Kepler, in combination withhigh-precision high-resolution spectroscopy and spectro-polarimetry of thebrightest pulsating cluster members. These ground-based spectroscopic data willbe assembled with the HERMES and CORALIE spectrographs (twin 1.2m Mercator andEuler telescopes, La Palma, Canary Islands and La Silla, Chile), as well aswith the spectro-polarimetric NARVAL instrument (2m BLT at the Pic du Midi,French Pyrenees), to which we have guaranteed access.

Ensemble Asteroseismology of the Young Open Cluster NGC 2244