Short time scale periodicity in H alpha emission from the main-sequence star H II 1883.
Abstract
H-alpha emission having a full width at its base of 700 km/s is observed in the main-sequence K star, H II 1883, confirming the report by Stauffer et al. (1984). Both the centroid and the width of the H-alpha emission vary synchronously with the 0.24 day rotation period of this Pleiades star. Based on the ratio H-alpha/H-beta, the absence of forbidden lines, and the inferred gas kinematics, this star must have an extended emission region of order one stellar radius in size. The periodic Doppler shifts of H-alpha probably arise from a wind with oppositely directed streams. If a significant fraction of the high-velocity material escapes from the star it will spin down in less than about 10 myr. This suggests that its remarkable properties may represent a natural, though transient stage in the evolution of late-type stars.
- Publication:
-
The Astrophysical Journal
- Pub Date:
- January 1985
- DOI:
- 10.1086/162787
- Bibcode:
- 1985ApJ...288..259M
- Keywords:
-
- H Alpha Line;
- Late Stars;
- Main Sequence Stars;
- Stellar Spectra;
- Variable Stars;
- Corotation;
- Emission Spectra;
- Luminosity;
- Radial Velocity;
- Star Clusters;
- Stellar Mass Ejection;
- Stellar Rotation;
- Stellar Winds;
- Astrophysics