Outer atmospheres of cool stars. X. HR 1099 at quadrature.
Abstract
IUE high-dispersion, far-UV spectra of the active-chromosphere RS CVn binary HR 1099 are reported. The emission features produced by such high-temperature species as C II and C IV are found to be very bright, to exhibit structure, change significantly in the one-week interval separating the two exposures, and generally follow the radial velocity motion of the K subgiant primary, while the less massive G dwarf secondary appears only weakly in the composite spectrum. It is concluded that chromospheric and transition region emission in RS CVn binaries is a stellar rather than system phenomenon, and the structure evident in some of the emission line shapes is interpreted as a patchy brightness distribution on and above the K star surface that is spread out in velocity by the rapid rotation.
- Publication:
-
The Astrophysical Journal
- Pub Date:
- March 1982
- DOI:
- 10.1086/159720
- Bibcode:
- 1982ApJ...254..168A
- Keywords:
-
- Binary Stars;
- Chromosphere;
- Cool Stars;
- Iue;
- Late Stars;
- Stellar Spectra;
- Stellar Temperature;
- Data Reduction;
- G Stars;
- K Stars;
- Radial Velocity;
- Spaceborne Astronomy;
- Stellar Rotation;
- Ultraviolet Spectra;
- Astrophysics