Globular clusters: Simple after all? (new paper accepted for MNRAS)

18 Sep

Screen Shot 2014-12-07 at 6.19.41 PMGlobular 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.

The Brightest Stars Don’t Live Alone (press release ESO/STScI)

26 Jul

A new study using ESO’s Very Large Telescope (VLT) has shown that most very bright high-mass stars, which drive the evolution of galaxies, do not live alone. Almost three quarters of these stars are found to have a close companion … Read More »

Hunting for runaway stars

29 Dec

In this astrometric program we use the unique capabilities of the Hubble Space Telescope to measure the proper motions of stars in the 30 Doradus region in the Large Magellanic Cloud. Here we present the first epoch of observations, a … Read More »

Fastest Rotating Star Found in Neighboring Galaxy (Press release ESO/STScI)

5 Dec

An international team of astronomers using the European Southern Observatory’s Very Large Telescope have found the fastest spinning star ever discovered. VFTS 102 rotates at a dizzying 1 million miles per hour and is very close to the point at … Read More »

A new record for the fastest rotating O-type star (New ApJ Letter)

1 Nov

The VLT-FLAMES Tarantula Survey: The fastest rotating O-type star and shortest period LMC pulsar – remnants of a supernova disrupted binary? P. L. Dufton, P. R. Dunstall, C. J. Evans, I. Brott, M. Cantiello, A. de Koter, S.E. de Mink, … Read More »