Results of an IUE program of monitoring the ultraviolet emission line fluxes of four binary systems: HR 1099, II Peg, AR Lac, and BY Dra.
Abstract
A program to obtain IUE spectra and optical photometry and spectra of three RS CVn-type binaries (HR 1099, II Peg, and AR Lac) and the prototype BY Dra system is reported. The systems were monitored for at least one orbital phase, and periodic variations in emission line flux from II Peg and HR 1099, indicative of notational modulation of an active region on these stars were detected. It is found that for II Peg the active region is in phase with photometric minimum as expected, but for HR 1099 ultraviolet emission maximum occurs at the time of photometric maximum.
- Publication:
-
NASA Conference Publication
- Pub Date:
- 1982
- Bibcode:
- 1982NASCP2238..554M
- Keywords:
-
- Astronomy;
- Binary Stars;
- Emission Spectra;
- Flux Density;
- Iue;
- Ultraviolet Spectra;
- Astrophysics;
- Celestial Bodies;
- Line Spectra;
- Optical Measurement;
- Photometry;
- RS CVn Stars:UV Spectra