SUMMARY OF PROPOSAL 61048
INSTITUTE OF SPACE AND ASTRONAUTICAL SCIENCE
KANAGAWA JAPAN 229
SAGAMIHARA
3-1-1 YOSHINODAI
Tel: 0427-51-3911 EXT.2082 Fax: 0427-59-4253
Medium: 2.5GB8MM
Subject: X-RAY BINARIES
BINARY STRUCTURE OF THE LOW MASS X-RAY BINARY 1254-690
ABSTRACT
It has been long puzzling problem how the LMXB systems has been created. One of the key clues to answer this question can be obtained by measuring the metal abundance of companion star's atmosphere. In some models, the metal abundance depends on the origin of the binary; i.e. capture or binary evolution. Spectral analysis of X-ray dips provides a unique opportunity to directory measure the metal abundance of accreting matter. For this kind of study we think X1254-690 is the best X-ray source. We estimate that we can constrain the abundances of silicon, sulphur, and iron atoms from a 40 ksec observation. We also intend to investigate the spectra of the bottom of dips. It is expected to reflect the feature of Accretion Disk Corona.
CO-INVESTIGATORS
| CO-I NAME | INSTITUTE | COUNTRY |
|---|
| KAZUHISA MITSUDA | ISAS | JAPAN |
| MICHAEL CHURCH | UNIV. BIRMINGHAM | UK |
| MONIKA BALUCINSKA-CHURCH | UNIV. BIRMINGHAM | UK |
| TADAYASU DOTANI | ISAS | JAPAN |
| KAZUMI ASAI | ISAS | JAPAN |
TARGETS
| TARGET NAME | PRI | RA | DEC | TIME | TC | OFF | GIS | SIS CNT | OBS |
|---|
| 1)X1254-690 | 3 | 194.4042 | -69.2889 | 40 ks | N | N | P | 18.00000 | 1 |