SUMMARY OF PROPOSAL 42057 DR. ROBIN HENRY DENYS CORBET NASA GODDARD SPACE FLIGHT CENTER/USRA MD USA 20771 GREENBELT GREENBELT ROAD E-mail: CORBET@LHEAMAIL.GSFC.NASA.GOV Tel: (301) 286 2851 Fax: (301) 286 1682 Medium: 4GBDAT Subject: X-RAY BINARIES Title: THE EMISSION LINE SPECTRUM OF GAMMA CAS Abstract: Gamma Cas was the first Be star to be discovered and has been extensively studied in the optical for over 100 years. It is also a well-known X-ray source and is thought to contain a compact object - based mainly on its similarity to X Per. However, unlike other members of the Be/neutron star class, a strong iron line has been detected in the X-ray spectrum of gamma Cas. Here we propose to study this line in detail utilizing the excellent spectral resolution of the SIS detectors. We request that this observation be made as close as possible to scheduled XTE, HST, IUE and ground based observations. Co-Is: 1 MYRON SMITH CSC USA MSMITH@IUEGTC.GSFC.NASA.GOV (301) 794-1464 2 TOSHIO MURAKAMI ISAS JAPAN 3 BRIAN THOMAS PENN STATE USA Target Name PRI RA Dec Time TC Off GIS SIS_Cts Obs ------------------- --- -------- -------- ---- -- --- --- ------- --- GAMMA CAS 0 14.1762 60.7169 20 Y N P 3.00000 1 Co-Ordinated Ob: Start: Dec 26, 1995 at 00 UT Stop: Dec 27, 1995 at 00 UT