Identification of Active Regions on the Eclipsing Binary Flare Star Pair YY Gem
Abstract
The eclipsing spectroscopic binary TY Cam is unique sand extremely interesting because both stars are identical dMle flare-active stars in a circular, short period (19.6 hr) orbit. Both stars are synchronously rotating; extended starspot regions, plage regions and regions of flare activity have previously been identified and napped out. Both stars are bright X-ray and 6 cm radio sources. We propose to Investigate the geometrical distribution of active regions on the stellar surfaces by taking a series of long and short wavelength IUE low dispersion spectra covering about 50% of just over three orbital periods; we will especially concentrate on taking spectra during tines of eclipse. In addition, the chromospheric and transition region fluxes will be compared to other dM and dMe stars to further toot the rotation-activity connection. Differential emission measure analysis will be used to compare active region properties to solar plage emission and to loop models. Intercomparisons will be made to photospheric variability (from simultaneous ground-based photometry and spectrophotometry) and to coronal variability (from simultaneous VLA observations of 6 cm gyroresonance emission).
- Publication:
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IUE Proposal
- Pub Date:
- 1983
- Bibcode:
- 1983iue..prop.1449H