SUMMARY OF PROPOSAL 41007
DR. NAOMI HIRANO
HITOTSUBASHI UNIVERSITY
TOKYO JAPAN 186
KUNITACHI
2-1 NAKA

  E-mail: HIRANO@HIGASHI.HIT-U.AC.JP	Tel: 0425-72-1101 EXT.5389	Fax: 0425-71-1893
  Medium: 2.5GB8MM

Subject: STARS                                                       
  Title: HARD X-RAY OBSERVATIONS OF THE YOUNG STELLAR OBJECTS IN ROH-OPH EAST (L1689) DARK CLOUD


Abstract:
 We propose to observe hard X-ray emission from the young stellar objects (YSOs) in
 roh-oph east (L1689) dark cloud. In this region, there are more than ten YSOs whose
 infrared classes are from Class I (protostars) to Class III (weak-line T Tauri
 stars), including extremely young protostar, IRAS 16293-2422. The X-ray emission
 from YSOs provides us direct information on the surface magnetic activities of YSOs
 even though they are deeply embedded in the molecular cloud cores. The purpose of
 our observations are (1) to search for the hard X-ray emission toward protostars,
 (2) to make a comparison in X-ray spectrum between protostars and T Tauri stars, and
 (3) to make clear at what stage of protostellar evolution the X-ray activities start.

 Co-Is:
   1                      	                                        
      (No Co-I contact data)


Target Name           PRI RA        Dec        Time TC  Off GIS SIS_Cts  Obs
-------------------   --- --------  --------   ---- --  --- --- -------  ---
ROH-OPH EAST (L1689)   2  247.9871  -24.6061    40   N   N   P  0.00700   1