SUMMARY OF PROPOSAL 72012
UNIVERSITY OF COLORADO
CAMPUS BOX 389
BOULDER
CO USA 80309-0389
Tel: 303-492-7810 Fax: 303-492-4052
Medium: CD ROM
Subject: STARS
TIME-RESOLVED CORONAL SPECTROSCOPY OF THE SHORT-PERIOD RS CVN BINARY ER VUL (GO V + G5 V)
ABSTRACT
We propose coordinated X-ray/UV/radio observations of the short-period RS CVn binary ER Vul using ASCA, HST/STIS, and ground-based radio telescopes. ER Vul contains two rapidly-rotating G dwarfs that allow study of coronal and chromospheric activity on solar-like stars at their highest activity levels. Our ASCA observations would cover three orbits (period =0.69d) of this partially-eclipsing binary, allowing study of coronal variability due to flaring and a search for phase-dependent orbital variability. The coronal X-rays and radio observations will be sensitive to flaring on few minute timescales, while the UV medium-resolution echelle spectra will probe the spatial structuring of cooler plasma through plage orbital modulation, eclipse obscuration, and Doppler location of flares.
CO-INVESTIGATORS
| CO-I NAME | INSTITUTE | COUNTRY |
|---|
| RACHEL OSTEN | CASA, U. OF COLORADO | USA |
| NICHOLAS WHITE | GSFC | USA |
| EDWARD GUINAN | VILLANOVA UNIVERSITY | USA |
| THOMAS AYRES | CASA, U. OF COLORADO | USA |
| STEPHEN DRAKE | LHEA/GSFC | USA |
TARGETS
| TARGET NAME | PRI | RA | DEC | TIME | TC | OFF | GIS | SIS CNT | OBS |
|---|
| 1)ER VUL | A | 315.6079 | 27.8073 | 100 ks | Y | N | P | 1.00000 | 1 |
TARGET 1
WINDOW FOR COORDINATED OBSERVATIONS IS 1999 OCT 25 TO DEC 5. ACTUAL SCHEDULING IS MORE CRITICAL BECAUSE THE HST DATA WILL BE IN 5 ORBIT PIECES, TO AVOID SAA, PLACED AT PARTICULAR ORBITAL PHASES.
COORDINATED OBSERVATION: START: Oct 25,1999 at 00STOP: Dec 5,1999 at 00