SUMMARY OF PROPOSAL 41006 DR. TETSUYA WATANABE NATIONAL ASTRONOMICAL OBSERVATORY TOKYO JAPAN 181 MITAKA 2-21-1 OSAWA E-mail: WATANABE@UVLAB.MTK.NAO.AC.JP Tel: 0422-34-3714 Fax: 0422-34-3700 Medium: 2.5GB8MM Subject: STARS Title: COORDINATED OBSERVATIONS OF AD LEO: TESTING THE FLARE MODEL Abstract: We request an 80 ks exposure of the dMe flare star AD Leo for the purpose of observing a stellar flare at coronal X-ray wavelengths with ASCA. The observation will be coordinated with photometry and spectroscopy from the EUVE spacecraft, for which we have already been awarded observing time by NASA. Simultaneous coverage will also be arranged for microwave observations with the VLA, and optical/IR photometry and spectroscopy from several ground-based sites. AD Leo is known to flare very often, and its flares are typically much more energetic than the most powerful flares observed on the Sun. Joint soft X-ray, XUV, and radio observations of the coronal emissions of this star will be used to test and refine a new physical model of stellar flares, which we have recently developed. Co-Is: 1 THEODORE SIMON IFA/UNIV. OF HAWAII USA SIMON@UHIFA.IFA.HAWAII.EDU 808-956-6317 2 GEORGE FISHER SSL/UNIV. OF CALIF. USA 3 SUZANNE HAWLEY MICH. STATE UNIV. USA 4 SCOTT CULLY SSL/UNIV. OF CALIF. USA 5 TIMOTHY BASTIAN NRAO/VLA USA Target Name PRI RA Dec Time TC Off GIS SIS_Cts Obs ------------------- --- -------- -------- ---- -- --- --- ------- --- AD LEO 2 154.9000 19.8700 80 Y N P 0.90000 1 REMARKS: TIME CRITICAL COORDINATED OBSERVATION CENTER TARGET ON ONE OF THE CCDS Co-Ordinated Ob: Start: Apr 24, 1996 at 00 UT Stop: May 20, 1996 at 00 UT