SUMMARY OF PROPOSAL 41041
DR KAZUMI ASAI
INSTITUTE OF SPACE AND ASTRONATUTICAL SCIENCE
KANAGAWA JAPAN 229
SAGAMIHARA
YOSHINODAI 3-1-1

  E-mail: ASAI@ASTRO.ISAS.AC.JP	Tel: 0427-51-3911	Fax: 0427-59-3924
  Medium: 2.5GB8MM

Subject: X-RAY BINARIES                                              
  Title: BLACK HOLE TRANSIENTS IN QUIESCENCE                                             


Abstract:
 Recent ASCA and ROSAT observations of soft and ultra-soft transients in quiescence
 revealed clear contrast between X-ray characteristics of the black hole and neutron
 star transients. There seems to be lower limit in quiescent luminosity of neutron
 star transients (1E32 erg/sec), while such limit is not seen in the black hole
 transients. Some of the black hole transients show significant low luminosity X-ray
 emission, which can be approximated by a blackbody of a few hundread eV. Origin of
 this emission is unclear. We propose systematic observations of black hole
 transients in quiescence to establish the difference from those including neutron
 star and to uncover the origing of the X-ray emission.

 Co-Is:
   1  HAJIME INOUE        	ISAS                          JAPAN     
      DOTANI@ASTRO.ISAS.AC.JP	0427-51-3911
   2  KAZUHISA MITSUDA    	ISAS                          JAPAN     
   3  TADAYASU DOTANI     	ISAS                          JAPAN     


Target Name           PRI RA        Dec        Time TC  Off GIS SIS_Cts  Obs
-------------------   --- --------  --------   ---- --  --- --- -------  ---
1543-475               2  236.7854  -47.6693    20   N   Y   P  0.10000   1 
          
H1705-250              2  257.0604  -25.0914    20   N   Y   P  0.10000   1 
          
A1524-62               2  232.0712  -61.8828    20   N   Y   P  0.10000   1