Blue stragglers at the centre of the post-core-collapse globular cluster NGC6397

Details Blue stragglers at the centre of the post-core-collapse globular cluster NGC6397 Blue stragglers at the centre of the post-core-collapse globular cluster NGC6397

Apr 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990natur.344..638a&link_type=abstract

Nature (ISSN 0028-0836), vol. 344, April 12, 1990, p. 638-640.

Astronomy and Astrophysics

Astronomy

85

Blue Stars, Brightness, Globular Clusters, Gravitational Collapse, Stellar Models, Astronomical Photometry, Binary Stars, Spatial Distribution, Stellar Evolution, Stellar Luminosity, Stellar Temperature

Scientific paper

A population of 'blue stragglers', stars that are too hot for their luminosity in relation to subgiant stars, has been discovered in the central region of NGC6397, a nearby evolved globular cluster which has passed through core collapse. Five of these blue stragglers are within 0.07 pc of the center of the cluster, and are brighter than the rest by one magnitude. It is suggested that the blue stragglers are either coalesced stars resulting from stellar collisions expected to occur especially during core collapse, or belong to a population of primordial close binaries that could provide the energy for the expansion of the core.

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