Globular clusters are old compact systems containing up to a about a million of stars. How so many stars form in such a small area still remains unclear. A particular puzzling feature is that effectively all globular cluster appear to harbor more than one stellar population within them.
In this paper we propose that a first generation of massive stars polluted their lower mass sisters while they were still fully convective PMS stars. While details still need to be worked out, a very attractive feature of this scenario is that it provides a solution for the long standing mass budget problem.
“Early Disc Accretion as the Origin of Abundance Anomalies in Globular Clusters“, by Bastian, Lamers, de Mink, Longmore, Goodwin & Gieles, 2013, MNRAS in press.
LEGUS, the Legacy ExtraGalactic UV Survey, has been granted 154 orbits of time on the Hubble Space Telescope to obtain NUV,U,B,V,I imaging for 50 nearby galaxies (closer than about 11 Mpc) that have been carefully selected to span the full … Read More »
Stellar models suggest that rotation can have drastic impact on the evolution of massive stars, but various aspects of these effects remain highly uncertain. One of the best place to study these effects is in #0 Doradus, which contains a … Read More »
The Hubble Tarantula Treasury Project (HTTP), an ongoing multi color imaging survey lead by Elena Sabbi of stellar populations in the Tarantula Nebula in the Large Magellanic Cloud that reaches into the sub-solar mass regime. An observational overview and first … Read More »
What fraction of the slow dusty wind of an AGB star can be captured by a binary companion? According to smooth particle hydro simulations by Mohammed, quite a bit more than is typically accounted for in binary evolutionary models. Especially … Read More »
Why do stars rotate the way they do? Nature or Nurture? Is their rotation rate set by their birth conditions or is it the result from evolutionary effects? For single stars their rotation rate remain almost unchanged as they evolve … Read More »
We report the detection of a strong, organized magnetic field in the secondary component of the massive binary system HD 47129 (Plaskett’s star). Eight independent Stokes V observations were acquiredin the context of the MiMeS (Magnetism in Massive Stars) survey … Read More »
The rotation rates of 335 apparently single early B-type stars in the Tarantula nebula show a bimodal distribution, resembling that found for late-B and early-A type stars. The origin of the bimodality remains unclear, although it is likely that magentic … Read More »
New paper Accepted for publication in A&A available on ArXiv. (Sana, de Koter, de Mink et al. 2012) With 360 O-type stars the Tarantula Survey of massive stars (Evans et al 2011) is the largest homogeneous sample of massive stars … Read More »
Astronomers have discovered two clusters full of very bright stars on the verge of merging. The clusters are located at a distance of 170,000 light years from Earth in the Large Magellanic Cloud, a small satellite galaxy of our Milky … Read More »