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Thomas Bensby. Profile photo.

Thomas Bensby

Senior lecturer

Thomas Bensby. Profile photo.

Projected Rotational Velocities of 136 Early B-type Stars in the Outer Galactic Disk

Author

  • C. D. Garmany
  • J. W. Glaspey
  • G. A. Braganca
  • S. Daflon
  • M. Borges Fernandes
  • M. S. Oey
  • Thomas Bensby
  • K. Cunha

Summary, in English

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 Ha.

Department/s

  • Lund Observatory

Publishing year

2015

Language

English

Publication/Series

The Astronomical Journal

Volume

150

Issue

2

Document type

Journal article

Publisher

IOP Publishing

Topic

  • Astronomy, Astrophysics and Cosmology

Keywords

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

Status

Published

ISBN/ISSN/Other

  • ISSN: 1538-3881