SUMMARY OF PROPOSAL 41053
MR. SHIN'ICHIRO UNO
INSTITUTE OF SPACE AND ASTRONAUTICAL SCIENCE
KANAGAWA JAPAN 229
SAGAMIHARA
3-1-1 YOSHINODAI

  E-mail: UNO@ASTRO.ISAS.AC.JP	Tel: 0427-51-3911 EXT.2622	Fax: 0427-59-4253
  Medium: 2.5GB8MM

Subject: X-RAY BINARIES                                              
  Title: MEASUREMENT OF METAL ABUNDANCE OF ACCRETING MATTER IN THE X-RAY BINARY, X1254-690


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 atomosphere. 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 oppotunity 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 estimat that we can constrain the abundances of silicon, sulphar, and
 iron atoms from a 40 ksec observation.

 Co-Is:
   1  KAZUHISA MITSUDA    	ISAS                          JAPAN     
      MITSUDA@ASTRO.ISAS.AC.JP	0427-51-3911EX(2617)
   2  TADAYASU DOTANI     	ISAS                          JAPAN     
   3  KAZUMI ASAI         	ISAS                          JAPAN     


Target Name           PRI RA        Dec        Time TC  Off GIS SIS_Cts  Obs
-------------------   --- --------  --------   ---- --  --- --- -------  ---
X1254-690              3  194.4042  -69.2889    40   N   N   P  18.00000   1