SUMMARY OF PROPOSAL 61021
KYOTO UNIV.
KYOTO JAPAN 606-01
KYOTO
KITASHIRAKAWA-OIWAKE-CHO, SAKYO
Tel: 075-753-3833 Fax: 075-701-5377
Medium: 2.5GB8MM
Subject: STARS
X-RAYS FROM YOUNG PROTOSTARS
ABSTRACT
Several observations with ASCA and ROSAT have shown that protostars are emitting X-rays, sometimes at very high levels (Lx ~ 10^32 - 36 erg s-1), either steadily or during flares. However, the detected protostars are relatively evolved (Class I), with ages ~ 10^5 yrs. We want to investigate whether younger protostars (Class 0), with ages ~ 10^4 yrs, are also X-ray emitters. The detection of X-rays from low-mass protostars has major implications on early stages of evolution of stars and the solar nebula. The main difficulty arises from the high extinction (Av > 70 mag) of these objects, but ASCA is well suited to overcome this difficulty with the extended energy range. We propose deep exposures (50 ks) of two star-forming regions with Class 0 sources, never observed so far in X-rays.
CO-INVESTIGATORS
| CO-I NAME | INSTITUTE | COUNTRY |
|---|
| YOHKO TSUBOI | KYOTO UNIV. | JAPAN |
| THIERRY MONTMERLE | SACLAY | FRANCE |
| NICOLAS GROSSO | SACLAY | FRANCE |
| ANDR'E PH | SACLAY | FRANCE |
| ERIC FEIGELSON | PEN STATE UNIV. | USA |
TARGETS
| TARGET NAME | PRI | RA | DEC | TIME | TC | OFF | GIS | SIS CNT | OBS |
|---|
| 1)L1448 | 1 | 51.4017 | 30.7557 | 50 ks | N | Y | P | 0.20000 | 1 |
| 2)L1582B | 1 | 83.0783 | 12.8186 | 50 ks | N | Y | P | 0.20000 | 1 |