SUMMARY OF PROPOSAL 61058

DR. SHUNJI KITAMOTO
KITAMOTO@ESS.SCI.OSAKA-U.AC.JP

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
CO-I NAME INSTITUTE COUNTRY
TAKAYUKI KOHMURAOSAKA UNIVERSITYJAPAN

TARGETS

TARGET NAMEPRIRADECTIMETCOFFGISSIS CNTOBS
1)CYGNUS X-3
3
308.1071 40.9580 40 ksN
Y
P
50.00000
4

TARGET 1

THE OBSERVATION SHOULD BE DIVIDED INTO FOUR TERMS, BUT THEY ARE NOT TIME CRITICAL.