Projected Rotational Velocities of 136 Early B-type Stars in the Outer Galactic Disk
(2015) In The 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)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/7978751
- author
- Garmany, C. D.
; Glaspey, J. W.
; Braganca, G. A.
; Daflon, S.
; Fernandes, M. Borges
; Oey, M. S.
; Bensby, Thomas
LU
and Cunha, K.
- organization
- publishing date
- 2015
- type
- Contribution to journal
- publication status
- published
- subject
- keywords
- stars:, emission-line, Be, stars: rotation, open clusters and associations: general, stars: early-type
- in
- The Astronomical Journal
- volume
- 150
- issue
- 2
- article number
- 41
- publisher
- IOP Publishing
- 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
- 2016-04-01 10:15:08
- date last changed
- 2024-03-24 05:29:51
@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.}}, 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}}, keywords = {{stars:; emission-line; Be; stars: rotation; open clusters and associations: general; stars: early-type}}, language = {{eng}}, number = {{2}}, publisher = {{IOP Publishing}}, series = {{The 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}}, doi = {{10.1088/0004-6256/150/2/41}}, volume = {{150}}, year = {{2015}}, }