SUMMARY OF PROPOSAL 81252
OSAKA UNIVERSITY
1-1, MACHIKANEYAMA
TOYONAKA
OSAKA JAPAN 560-0043
Tel: Fax:
Medium: CD ROM
Subject: AGN
Hard tail variability in early-type star
ABSTRACT
So far early type stars have been believed to have no magnetic field,and the X-rays come from the stellar wind. Recently, some objections to this standard understanding have been reported; detection of X-ray hard tails with power law shape ; evidence of the plasma ejection from the stellar surface ; a large scale optical depth variation originated on the stellar surface. From these observational context, we suppose that the X-ray hard tail comes from a magnetically confined hot plasma on the stellar surface, hence the X-ray hard tail must be variable. In order to examine this possibility, we propose a long term observation of a bright B0 star, tau Sco.
CO-INVESTIGATORS
| CO-I NAME | INSTITUTE | COUNTRY |
|---|
| | | |
TARGETS
| TARGET NAME | PRI | RA | DEC | TIME | TC | OFF | GIS | SIS CNT | OBS |
|---|
| 1)tau Sco | A | 248.8960 | -28.2686 | 80 ks | Y | N | P | | 4 |