1. X-rays from Massive Star Fo ｒ ming Region (YSO) ？ Sgr B2 、 Arches, Mon R2 Herbig Ae/Be stars

2. Sgr B2 Cluster of Massive Stars. No10: Associated to UC HII regions No13: No association to UC HII regions No13 No10

3. ｋT～10(4.1-30) N H ～4.0(1.9-8.8 ) Lx~ 13 x10 32 erg/s ｋT～4.8(> 1.1) N H ～4.0(2.4-7.3 )10 ２３ Lx~8 x10 32 erg/s Total Lx~10 33 erg/s  Each Lx ～ 10 32 erg/s No10: Strong iron line (Abundance ~5M ◎ ) No13: Weak iron line

4. Arches Cluster ● IR ； No21, 23, 26: High mass (Initial mass > 100M ◎ ) ● Radio ； AR1, 4

5. Name kT N H L x (keV) (10 23 Hcm -2 ) (10 33 erg s -1 ) 26 2.4(1.3-5.6) 6.9(4.5-11.2) 2.8(2.3-3.4) 21(AR4) 1.3(0.6-2.5) 9.3(5.6-15.5) 3.9(3.1-4.7) 23(AR1) 1.6(1.0-2.7) 9.9(6.514.8) 5.0(4.2-6.0) Irradiation by the Arches X-ray Total luminosity ~10 35 ergs/s 10 time larger than the present value. One possibility is that the Arches cluster may be brighter in the past.

6. Mon R2 Cloud 2.5 M ◎ More massive than B H-K K

7. kT ～ 2 - 10 keV, L x ～ 10 31 erg/s Rapid variability NamekT N H Lx (keV) (10 22 Hcm -2 ) (10 31 erg/s) IRS 1SW 1.9(1.3-2.8) 4.7(3.5-6.4)1 (0.6- 2.0) a S 2.6(1.6-6.2) 6.0(4.0-9.2)0.6(0.4- 1.6) IRS 2 10.9( > 2.0) 9.1(5.7-17) 0.6(0.5-2.0)

8. X-ray Properties with Chandra

9. ASCA detection of Herbig Ae/Be Stars Detection rate ~40% (>10 30 ergs/s)

10. Temperature vs Wind Velocity of Herbig Ae/Be 2~3keV

11. MWC 297 : O9 - B1.5 N H ～ 2.4×10 22 (Av =10 agree with optical) Temperature Excursion kT= 2.7keV  6.7keV  3.2 keV 2.7keV 6.7keV 3.2keV

12. Temperature Excursion of Individual Herbig Ae/Be Quiescent (●), Flare (□), Decay ( △ )

13. Unified View of X-ray emission from Stars

14. Ｕｎｉｆｉ ed Picture of X-rays From Stars 10 6 yrs