Projected rotational velocities of 136 early B-type stars in the outer galactic disk

C. D. Garmany, J. W. Glaspey, G. A. Bragança, S. Daflon, M. Borges Fernandes, M. S. Oey, T. Bensby, K. Cunha

Research output: Contribution to journalArticlepeer-review

9 Scopus citations


We have determined projected rotational velocities, v sin i, from Magellan/MIKE echelle spectra for a sample of 136 early B-type stars having large Galactocentric distances. The target selection was done independently of their possible membership in clusters, associations or field stars. We subsequently examined the literature and assigned each star as Field, Association, or Cluster. Our v sin i results are consistent with a difference in aggregate v sin i with stellar density. We fit bimodal Maxwellian distributions to the Field, Association, and Cluster subsamples representing sharp-lined and broad-lined components. The first two distributions, in particular, for the Field and Association are consistent with strong bimodality in v sin i. Radial velocities are also presented, which are useful for further studies of binarity in B-type stars, and we also identify a sample of possible new double-lined spectroscopic binaries. In addition, we find 18 candidate Be stars showing emission at Hα.

Original languageEnglish (US)
Article number41
JournalAstronomical Journal
Issue number2
StatePublished - Aug 1 2015
Externally publishedYes


  • open clusters and associations: general
  • stars: early-type
  • stars: emission-line, Be
  • stars: rotation

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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