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

Garmany, C. D.; Glaspey, J. W.; Braganca, G. A.; Daflon, S.; Fernandes, M. Borges; Oey, M. S.; Bensby, Thomas LU and Cunha, K. (2015) In Astronomical Journal 150(2).
Abstract
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.... (More)
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. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
stars:, emission-line, Be, stars: rotation, open clusters and associations: general, stars: early-type
in
Astronomical Journal
volume
150
issue
2
publisher
The American Astronomical Society
external identifiers
  • wos:000358856900002
  • scopus:84938359985
ISSN
1538-3881
DOI
10.1088/0004-6256/150/2/41
language
English
LU publication?
yes
id
14a7e919-3ae2-4f23-b382-d09b2ba6b26c (old id 7978751)
date added to LUP
2015-09-25 12:01:55
date last changed
2017-10-22 03:10:55
@article{14a7e919-3ae2-4f23-b382-d09b2ba6b26c,
  abstract     = {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.},
  articleno    = {41},
  author       = {Garmany, C. D. and Glaspey, J. W. and Braganca, G. A. and Daflon, S. and Fernandes, M. Borges and Oey, M. S. and Bensby, Thomas and Cunha, K.},
  issn         = {1538-3881},
  keyword      = {stars:,emission-line,Be,stars: rotation,open clusters and associations: general,stars: early-type},
  language     = {eng},
  number       = {2},
  publisher    = {The American Astronomical Society},
  series       = {Astronomical Journal},
  title        = {Projected Rotational Velocities of 136 Early B-type Stars in the Outer Galactic Disk},
  url          = {http://dx.doi.org/10.1088/0004-6256/150/2/41},
  volume       = {150},
  year         = {2015},
}