Hui Dong (USA): Unveiling the massive stars beyond the three young massive star clusters

HST/NICMOS PaA GC survey
  • Color-based stellar classification + WN,WC stars
  • Isolated WN stars + ejected from clusters
  • spectroscopy of 8 "isolated" stars + LOS velocity to determine memberships...
  • new Of I star

Questions

  • Q: Mass segregation? Do you expect such a large number of stars kicked out?
  • A: Yes. High density of massive stars in cores, 3-body interaction common there
  • Q: NIII and HeII lines? Stellar wind effects move the centroid
  • Q: Radial velocities are isolated stars on one side of Arches cluster. Is that expected?
  • A: I don't know if we expect that.
  • Q: What stellar masses of escaped stars?
  • A: Not measured yet.
  • A Cornelia: many are radio-continuum detected. Consistent with stellar wind predictions
  • Q Farhad: Star formation rate from runaways?
  • A: Half of the stars come from clusters. Double the SFR from the clusters. 0.05 Msun/yr
  • Q Mark Pound (?): Orbital histories. Are any of the orbits more likely than the others?
  • A: Some could have been members.

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