SUMMARY OF PROPOSAL 71020

DR. KATSUJI KOYAMA
KOYAMA@CR.SCPHYS.KYOTO-U.AC.JP

KYOTO UNIVERSITY
KITASHIRAKAWA OIWAKE CHO
KYOTO
KYOTO JAPAN 606-8502
Tel: 81-75-753-3833 Fax: 81-75-753-3799
Medium: 2.5GB8MM
Subject: STARS

SYSTEMATIC SPECTRAL STUDY OF MASSIVE WOLF-RAYET BINARIES WITH ASCA


ABSTRACT

We propose the systematic spectral study of massive Wolf-Rayet binaries with ASCA. All the proposed targets have been not detected in the hard X-ray band. Then the first goal is to detect the hard X-ray emission. With the spectroscopic capability of ASCA, we will find the emission lines from highly ionized ions, which give a firm evidence for the shock-heated plasma due to the wind-wind collision. We try to determine absorption column, temperature, and luminosity for the hard component. We also check whether the hard component varies or not. With these observational results, we will construct the unified model for the massive W-R binaries. Furthermore, we estimate the abundances by fitting the spectra. We compare them with the WR type (WN and WC) and test the chemical evolution model.

CO-INVESTIGATORS
CO-I NAME INSTITUTE COUNTRY
YOSHITOMO MAEDAPENN. STATE UNIV.USA
YOHKO TSUBOIKYOTO UNIVERSITYJAPAN
JUN YOKOGAWAKYOTO UNIVERSITYJAPAN
MICHAEL CORCORANGSFC/NASAUSA
KEN EBISAWAGSFC/NASAUSA
GORDON GARMIREPENN. STATE UNIV.USA
STEPHAN SKINNERJILAUSA

TARGETS

TARGET NAMEPRIRADECTIMETCOFFGISSIS CNTOBS
1)WR43
B
168.7796-61.2592
40 ks
N
Y
P
0.30000
2
2)WR48
B
197.0296-65.3059
40 ks
N
Y
P
0.20000
2