Rotational velocities of later B type and A type stars as determined from ultraviolet versus visual line profiles.
Abstract
Theoretical line profiles of the Si III 1299 and Fe II 2756 lines are computed for rotating B5-A7 model stars, and compared with observed profiles from IUE spectra to derive rotational velocities. Real differences in widths for ultraviolet as compared with visual line profiles exist in the sample of B type stars (but not for the A type rapidly rotating stars), although these are not as large as previously reported in the literature. Comparison with the theoretical line profiles gives rotational velocities that are in good agreement with visually determined v sin i values for the same stars, which suggests that the shape-distorted, gravity-darkened models are reasonable.
- Publication:
-
The Astrophysical Journal
- Pub Date:
- November 1984
- DOI:
- 10.1086/162650
- Bibcode:
- 1984ApJ...286..741C
- Keywords:
-
- A Stars;
- Angular Velocity;
- B Stars;
- Stellar Rotation;
- Ultraviolet Spectra;
- Visible Spectrum;
- Early Stars;
- Iron;
- Iue;
- Line Shape;
- Silicon;
- Spectrum Analysis;
- Stellar Models;
- Astrophysics