SUMMARY OF PROPOSAL 71031
INSTITUTE OF SPACE AND ASTRONAUTICAL SCIENCE
3-1-1 YOSHINODAI
SAGAMIHARA
KANAGAWA JAPAN 229-8510
Tel: 0427-59-8155 Fax: 0427-59-8455
Medium: 2.5GB8MM
Subject: CATACLYSMIC VARIABLES
FINDING A BE STAR WITH A WHITE DWARF COMPANION
ABSTRACT
Although many theories of close binary system predict the existence of early-type main sequence stars (Be) with a white dwarf companion, the system is not yet discovered, except Gamma Cas. ROSAT surveyed OB and OBe stars aimed at finding Be + white-dwarf system, but any evidence was not found. This was because the ROSAT band could not distinguish the coronal X-rays of OB stars from the companion. ROSAT also did not cover the 6.7 keV Fe line necessary to probe 10keV thin thermal plasma. Thanks to the ASCA's wide energy band up to 10 keV, accreting white-dwarf is detectable. We have observed only one candidate system, Gamma Cas. To firmly prove the existence of a Be + white dwarf system, we propose to observe another example.
CO-INVESTIGATORS
| CO-I NAME | INSTITUTE | COUNTRY |
|---|
| TOSHIO MURAKAMI | ISAS | JAPAN |
| MANABU ISHIDA | ISAS | JAPAN |
TARGETS
| TARGET NAME | PRI | RA | DEC | TIME | TC | OFF | GIS | SIS CNT | OBS |
|---|
| 1)48 PER | C | 62.1646 | 47.7130 | 40 ks | N | Y | P | 0.20000 | 1 |