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Fast rotating blue stragglers prefer loose clusters.

Francesco R Ferraro1,2, Alessio Mucciarelli3,4, Barbara Lanzoni3,4

  • 1Dipartimento di Fisica e Astronomia "Augusto Righi", Alma Mater Studiorum Universita' di Bologna, Via Piero Gobetti 93/2, I-40129, Bologna, Italy. francesco.ferraro3@unibo.it.

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Fast-rotating blue stragglers are more common in low-density globular clusters. This finding suggests recent blue straggler formation in less dense environments, offering new insights into their evolution.

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Area of Science:

  • Astronomy and Astrophysics
  • Stellar Evolution
  • Stellar Dynamics

Background:

  • Blue stragglers are luminous stars with unknown formation and evolutionary paths.
  • They form through mass transfer or stellar collisions in binary/triple systems.

Purpose of the Study:

  • To investigate the relationship between blue straggler rotation rates and their host globular cluster environments.
  • To constrain the formation and evolutionary processes of blue stragglers.

Main Methods:

  • Analysis of 320 high-resolution spectra of blue stragglers.
  • Observation of stars in eight galactic globular clusters with varying densities.
  • Measurement of blue straggler rotational velocities.

Main Results:

  • The fraction of fast-rotating blue stragglers (v > 40 km/s) increases as the host cluster's central density decreases.
  • Fast-spinning blue stragglers are preferentially found in lower-density environments.

Conclusions:

  • Results indicate a preference for fast-spinning blue stragglers in low-density environments.
  • This suggests recent blue straggler formation activity in such regions.
  • Provides constraints on the timescale of slow-down processes in collisional blue stragglers.