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Augusto Damineli IAG-USP

The eta Carinae excitment. Augusto Damineli IAG-USP. www.etacarinae.iag.usp.br. Why  Carinae is exciting/important?. Exotic X Prototype. At the upper limit of the IMF => stellar structure & evolution.

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Augusto Damineli IAG-USP

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  1. The eta Carinae excitment Augusto Damineli IAG-USP www.etacarinae.iag.usp.br

  2. Why  Carinae is exciting/important? Exotic X Prototype At the upper limit of the IMF => stellar structure & evolution Large impact on the dynamics and chemical composition of newborn galaxies (galaxy evolution) Rare in the nearby Universe (space & time), but dominates the light of distant (young) galaxies

  3. Why  Carinae is important? One of the few spatially resolved examples Very important to test models for stellar structure, stability and evolutionary tracks Present day models of very massive stars: unreliable at large extent.

  4. Chemical yelds: Oxigen (α-elements) H2O

  5. GRB011121 Host galaxy Milky Way stars Gama-ray (long) => Hypernovae >L*

  6. Black hole progenitors

  7. How it went to the hall of fame ? • 1843: second brightest star on the sky • survived a supernova-like explosion E >1050 erg • well documented photometry (190 years) and spectroscopy (145 years)

  8. eta Car light curve L = 5 106 L 2009 1827 1940 1890 1843 “SN impostor ?”

  9. Homunculus: ejected in 1843 600 km/s 500 x solar system previous ejection ~1000 A.C.

  10. 1” scale Little Homunculus: ejected in 1890 Ishibashi et al. 2003 Equatorial disk Nathan Smith courtesy

  11. ESO: Interferometry

  12. rotation axis Stellar wind VLTI 2.2mm res~0.005” wind 10-3M/year van Boekel et al. 2003

  13. Homunculus orientation 420 Plane of the sky Davidson et al. 2001

  14. γ-ray beam

  15. When this is going to happen ?

  16. Nitrogen >> Solar Oxigen << Solar CNO cicle Davidson et al. 1986

  17. N. Smith, Nature Sept/2008 Homunculus => 12 M Speed 600 Km/s Ek = 1050 erg NOT a SN impostor!

  18. N. Smith, Nature Sept/2008 • Must have been a true SN! • Partial explosion? • Pair instability? • 1843: the first in a row of explosions?

  19. The 5.5-yr cycle S Dor cycle? Damineli, 1996 1500 L

  20. Binary model

  21. Binary model

  22. Binary model

  23. Prediction X-rays:hard, variable, absorbed 600 km/s 2500 km/s ½ mv2=3/2 kT ~80 MK

  24. Observations (RXTE - Corcoran) Eclipses?

  25. Radio 6-cm CAN’T BE AN ECLIPSE!

  26. The 2009/January/11 event

  27. The 2009/January/11 event HeII 4686 A line Recombination He++ => He+ L~300 L Huge reservoir of He+ ionizing photons (E > 54 eV photons) Source?

  28. Year 1997.9 P = 2016 d 1 = 50 days ..1.. .5 1994.7 1998.0

  29. Year 2003.5 P = 2020 d 1 = 7 days 1992.5 1994.7 1998.0

  30. Year 2009.0 P = 2022.7 d 1 = 1.3 days .7 1998.0

  31. Year 2014.5 P = ? d 1 = 0.? days .7 1998.0 ? Period variations: Important for orbital evolution due to strong mass-loss and tidal effects

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