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INDIAN RESEARCHERS STUDY ON BLUE STRAGGLERS

INDIAN RESEARCHERS STUDY ON BLUE STRAGGLERS

Context:

Indian researchers found that half of the blue stragglers in their sample was formed by a mass transfer from the nearest binary companion star, while one-third may have been caused by a two-star collision. And the rest is built on a combination of more than two stars. This first-ever comprehensive analysis of blue stragglers has been published in the journal Monthly Notices of the Royal Astronomical Society.

Important Findings:

  • Carrying out the first-ever comprehensive analysis of blue stragglers, the researchers said, and the only way these stars could still be present in these clusters is if they have somehow acquired extra mass along the way while on the main sequence.
  • Determining the methods of mass gain required a study using a large sample of blue-straggler stars and estimates of the size obtained.
  • They found that among the clusters they scanned, 228 had a total of 868 green stragglers.
  • It has been shown that these stars exist mainly in older and massive star clusters. And because of their large mass, they are segregated towards the centre of the clusters.
  • Researchers compared the size of the blue stragglers to the mass of the turnoff stars (which are the most massive 'normal' stars in the cluster) and predicted the formation mechanisms.

Blue stragglers:

  • It is a class of stars on open or globular clusters that stand out as they are bigger and bluer than the rest of the stars.

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