Affordable Access

Access to the full text

Fast rotating Blue Stragglers in the globular cluster M4

Authors
  • Lovisi, L.
  • Mucciarelli, A.
  • Ferraro, F. R.
  • Lucatello, S.
  • Lanzoni, B.
  • Dalessandro, E.
  • Beccari, G.
  • Rood, R. T.
  • Sills, A.
  • Pecci, F. Fusi
  • Gratton, R.
  • Piotto, G.
Type
Preprint
Publication Date
Jul 14, 2010
Submission Date
Jul 14, 2010
Identifiers
DOI: 10.1088/2041-8205/719/2/L121
Source
arXiv
License
Yellow
External links

Abstract

We have used high resolution spectra obtained with the spectrograph FLAMES at the ESO Very Large Telescope to determine the kinematical properties and the abundance patterns of 20 blue straggler stars (BSSs) in the globular cluster M4. We found that ~ 40% of the measured BSSs are fast rotators (with rotational velocities > 50 km/s). This is the largest frequency of rapidly rotating BSSs ever detected in a globular cluster. In addition, at odds with what has been found in 47 Tucanae, no evidence of carbon and/or oxygen depletion has been revealed in the sample of 11 BSSs for which we were able to measure the abundances. This could be due either to low statistics, or to a different BSS formation process acting in M4.

Report this publication

Statistics

Seen <100 times