SUMMARY OF PROPOSAL 81402
ISAS
3-1-1 YOSHINO-DAI
SAGAMIHARA
KANAGAWA JAPAN 229-8510
Tel: 042-759-8151 Fax: 042-759-8455
Medium: CD ROM
Subject: X-RAY BINARIES
INVESTIGATION OF THE ABSORPTION LINE FEATURES IN THE X-RAY BURST SPECTRA
ABSTRACT
Unique absorption line features around 4.1 keV have been detected in the burst spectra from at least three low-mass X-ray binaries. If they are a gravitationally redshifted atomic line and the responsible element is identified, the observed redshift factor will directly give the mass to radius ratio of the neutron stars. We propose a detailed investigation of the absorption line for the bursts from X1608-52 with ASCA SIS. For two week observations, we expect to detect more than 10 X-ray bursts with moderate strength in high telemetry bit rate. This may be the last chance to investigate the absorption line features in the bursts with the high resolution spectrometers.
CO-INVESTIGATORS
| CO-I NAME | INSTITUTE | COUNTRY |
|---|
| YASUO TANAKA | MPE | JAPAN |
| KAZUHISA MITSUDA | ISAS | JAPAN |
| TATEHIRO MIHARA | RIKEN | JAPAN |
| TARO KOTANI | GSFC | JAPAN |
| KAZUMI ASAI | KANAGAWA UNIV | JAPAN |
TARGETS
| TARGET NAME | PRI | RA | DEC | TIME | TC | OFF | GIS | SIS CNT | OBS |
|---|
| 1)4U1608-52 | A | 243.1792 | -52.4230 | 500 ks | N | N | P | 400.00000 | 1 |
TARGET 1
IF X1608-52 IS IN OUTBURST, WE WILL SWITCH THE TARGET TO X1636-53.