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Early Type Stars Observed with ASCA

Early Type Stars Observed with ASCA. Classification Wind Collision & Single Star Objection on the Standard Line Driven Instabilities Elemental Abundance. Six Single Stars. Classification. Colliding Wind Shock HD19379 3.2 keV γ2 Vel 0.3keV+1.4keV V444 Cyg 0.6keV+2 keV

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Early Type Stars Observed with ASCA

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  1. Early Type Stars Observed with ASCA • Classification • Wind Collision & Single Star • Objection on the Standard Line Driven Instabilities • Elemental Abundance Six Single Stars

  2. Classification • Colliding Wind Shock • HD19379 3.2 keV • γ2 Vel 0.3keV+1.4keV • V444 Cyg 0.6keV+2 keV • WR147 1keV dominant • Single Stars • δOri 0.42 keV • CygOB２ 0.6~3.2 keV • τSco 0.49 keV +HT • λOri 0.35keV+ HT • ζOri 0.43 keV • ζOph 0.54 keV • ζPup 0.59 keV V444 Cyg: Colliding Wind

  3. Classification • Others • 30 Dor • BH Binaries? • Planetary Nebula • Wind-flown Bubble? • Eta Carinae • ? ηCar　ｂｙ Tsuboi et al. 1997 Ｃｏｒｃｏｒａｎ et al. 1998

  4. Objection to The StandardLine Driven Instability Model? • Hot Component • τ　Ｓｃｏ、λ　Ｏｒｉ • Non Thermal Comp. • Magnetic Origin? • Cohen et al. 1997 • Plan • Universal Analysis of all the ASCA data

  5. Elemental Abundance • Enrichment of Ne in HD193794 • Enrichment of N in ηCar • CNO Cycle processed matter • Metal Depletions in Early Type Stars ηCar by Tsuboi et al.(1997)

  6. Elemental Abundance • Metal Depletions in Early Type Stars • Multiple Temp? • Optically Thick? • Real Depletion? • Neuton’s Objective Single Temperature Multi Temperature

  7. Proposal: Examination of the Standard Line Driven Instability • Some Objections • Hard Tails in τSco and λOri • Evidence of Gas Ejection

  8. Proposal: Examination of the Standard Line Driven Instability • IUE Observation • Plasma fixed on the surface of the star • Possibly associated with large-scale magnetic structure • Z-Pup • HD64760 • X-ray Hard Tail • Magnetic Field? Howarth et al. 1995

  9. Proposal: Examination of the Standard Line Driven Instability • Highly Variable in hard X-rays with a time scale of ~days • Objective • Detection of Variability and study of spectral change • Plan • Z-Ori, 10ksec x 10 days Z-Ori by ROSAT

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