SUMMARY OF PROPOSAL 71022
KYOTO UNIV.
KITASHIRAKAWA-OIWAKE-CHO, SAKYO
KYOTO
KYOTO JAPAN 606-8502
Tel: 075-753-3843 Fax: 075-753-3799
Medium: 2.5GB8MM
Subject: STARS
DISCOVERY OF X-RAY FROM BROWN DWARFS
ABSTRACT
We detected X-ray from Brown Dwarf with ROSAT PSPC. Then we confirmed the hard X-ray from the position with ASCA data. There is no other catalogued source in 2 arcmin from the position, then this is the first discovery of X-ray from BD. There is no theory which predicts strong X-ray from BD which is fully convective and has no disk. Accordingly, this discovery will require reformation of X-ray emisison mechanism in stars in general. The most notable meaning of the discovery of X-ray from BD is that it will be powerful tool for BD survey and it will pioneer new field of X-ray astronomy. This goal is to confirm the X-ray from BD and to discover new X-rays from BDs, to obtain the spectra and time variabilities in broad X-ray band, and finaly to investigate the X-ray emission mechanism.
CO-INVESTIGATORS
| CO-I NAME | INSTITUTE | COUNTRY |
|---|
| KATSUJI KOYAMA | KYOTO UNIV. | JAPAN |
| KENJI HAMAGUCHI | KYOTO UNIV. | JAPAN |
| HIROSHI MURAKAMI | KYOTO UNIV. | JAPAN |
| SHIGEO YAMAUCHI | IWATE UNIV. | JAPAN |
| RALPH NEUH\"AUSER | MPE | GERMANY |
| YOSHITOMO MAEDA | JSPS | JAPAN |
TARGETS
| TARGET NAME | PRI | RA | DEC | TIME | TC | OFF | GIS | SIS CNT | OBS |
|---|
| 1)CHAIBROWNDWARFS | B | 166.8208 | -77.5983 | 100 ks | N | Y | P | 0.10000 | 1 |