Blue straggler
Blue stragglers are stars in open or globular clusters that are hotter and bluer than other cluster stars having the same luminosity. Thus, they are separate from other stars on the cluster's Hertzsprung-Russell diagram.
Poor Blue Straggler
By Old Jim
To Be Sung to a Blues Tune. Go to the linked version.
I'm a poor blue straggler
On the HR diagram...
I don't know where I came from
And I don't know who I am...
Blue Straggler
A of high effective temperature which falls along the despite the presence of an obvious at lower temperatures in the .
Discovered in 1953 by Allan Sandage, Blue Stragglers, or BSSs, are known for their striking color and luminosity in otherwise homogeneous galactic and globular clusters.
Blue Stragglers
(a) Stars (in a cluster) which fall close to the cluster's extrapolated main sequence but which occur a few magnitudes above its turnoff point.
Blue stragglers shine brightly, are older than they appear, and, unusually, gain mass at a late stage of life.
Blue stragglers in the central region of the globular cluster NGC 6397.
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These blue stragglers are also observed in globular clusters, and in the very dense cores of globulars they are believed to arise when stars collide, forming a much hotter, more massive star.
Ba is overabundant in blue stragglers of an old open cluster (Mathys 1991) and underabundant in HB stars (Aldelman and Philip 1992a). BaII lines are very strong in the spectra of the so-called Ba stars.
Particular in this cluster is a large population of "blue stragglers" at the core of the cluster. These stars are unusually young and massive in comparison with the other stars in the globular cluster.
The inset is a high-resolution ultraviolet image of 47 Tucanae's core region, taken with the Hubble Space Telescope and showing many "blue stragglers""massive stars lying on the main sequence above the turnoff point, ...
Although all of the stars in the cluster NGC 188 are billions of years old, a few of them look much younger. They have undergone a stellar rejuvenation process, becoming "blue stragglers." [NOAO/AURA/NSF]
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Consequently, globular clusters include some exotic classes of stars, including blue stragglers, low-mass x-ray binaries and millisecond pulsars.
The cluster has a very densely populated core and contains at least 22 milisecond pulsars (pulsars with a rotational period between 1 and 10 miliseconds) and 21 blue stragglers (stars bluer and hotter than other stars in the cluster that have the ...
 See also: Cluster, Star, Giant, Sun, Solar
  
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