Projected Rotational Velocities of 136 Early B-type Stars in the Outer Galactic Disk
Författare
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.
Avdelning/ar
Publiceringsår
2015
Språk
Engelska
Publikation/Tidskrift/Serie
The Astronomical Journal
Volym
150
Issue
2
Dokumenttyp
Artikel i tidskrift
Förlag
IOP Publishing
Ämne
- Astronomy, Astrophysics and Cosmology
Nyckelord
- stars:
- emission-line
- Be
- stars: rotation
- open clusters and associations: general
- stars: early-type
Status
Published
ISBN/ISSN/Övrigt
- ISSN: 1538-3881