Computer Science
Scientific paper
Dec 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009natur.462.1028f&link_type=abstract
Nature, Volume 462, Issue 7276, pp. 1028-1031 (2009).
Computer Science
24
Scientific paper
Stars in globular clusters are generally believed to have all formed at the same time, early in the Galaxy's history. `Blue stragglers' are stars massive enough that they should have evolved into white dwarfs long ago. Two possible mechanisms have been proposed for their formation: mass transfer between binary companions and stellar mergers resulting from direct collisions between two stars. Recently the binary explanation was claimed to be dominant. Here we report that there are two distinct parallel sequences of blue stragglers in M30. This globular cluster is thought to have undergone `core collapse', during which both the collision rate and the mass transfer activity in binary systems would have been enhanced. We suggest that the two observed sequences are a consequence of cluster core collapse, with the bluer population arising from direct stellar collisions and the redder one arising from the evolution of close binaries that are probably still experiencing an active phase of mass transfer.
Beccari Giacomo
Bovinelli S.
Dalessandro Emanuele
Ferraro Francesco R.
Fusi Pecci Flavio
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