SUMMARY OF PROPOSAL 61058
GRADUATE SCHOOL OF SCIENCE, OSAKA UNIVERSITY
OSAKA JAPAN 560
TOYONAKA
1-1, MACHIKANEYAMA-CHO
Tel: 06-850-5478 Fax: 06-850-5539
Medium: 4GBDAT
Subject: X-RAY BINARIES
CYG X-3 IN ITS LOW STATE
ABSTRACT
In the low state of Cyg X-3, it shows the brightest iron emission line in the sky. ASCA, however, has not yet observed the low state of Cyg X-3. Cyg X-3 was observed with ASCA two times in its high state. ASCA found many emission lines form various elements and emission-line-like feature produced by free-bound transition for S XVI. This was the first direct evidence of the photo-ionized plasma in the universe. The plasma condition should be influenced by the luminosity and the energy spectrum of the central source. The observation of the low state of Cyg X-3 will provide various surprising feature that we have never seen.
CO-INVESTIGATORS
TARGETS
| TARGET NAME | PRI | RA | DEC | TIME | TC | OFF | GIS | SIS CNT | OBS |
|---|
| 1)CYGNUS X-3 | 3 | 308.1071 | 40.9580 | 40 ks | N | Y | P | 50.00000 | 4 |
TARGET 1
THE OBSERVATION SHOULD BE DIVIDED INTO FOUR TERMS, BUT THEY ARE NOT TIME CRITICAL.