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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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Presentation Transcript
slide1

The eta Carinae

excitment

Augusto Damineli IAG-USP

www.etacarinae.iag.usp.br

slide2

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

slide3

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.

slide5

GRB011121

Host galaxy

Milky Way stars

Gama-ray (long) => Hypernovae >L*

slide7

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)
slide8

eta Car light curve

L = 5 106 L

2009

1827

1940

1890

1843

“SN impostor ?”

slide9

Homunculus: ejected in 1843

600 km/s

500 x solar system

previous ejection ~1000 A.C.

slide10

1”

scale

Little Homunculus: ejected in 1890

Ishibashi et al. 2003

Equatorial disk

Nathan Smith courtesy

slide12

rotation axis

Stellar wind

VLTI 2.2mm res~0.005”

wind

10-3M/year

van Boekel et al. 2003

slide14

Homunculus orientation

420

Plane of the sky

Davidson et al. 2001

slide16

When this is

going to happen ?

slide17

Nitrogen >> Solar

Oxigen << Solar

CNO cicle

Davidson et al. 1986

slide18

N. Smith, Nature Sept/2008

Homunculus => 12 M

Speed 600 Km/s

Ek = 1050 erg

NOT a SN impostor!

slide19

N. Smith, Nature Sept/2008

  • Must have been a true SN!
  • Partial explosion?
  • Pair instability?
  • 1843: the first in a row of explosions?
slide20

The 5.5-yr cycle

S Dor cycle?

Damineli, 1996

1500 L

slide24

Prediction X-rays:hard, variable, absorbed

600 km/s

2500 km/s

½ mv2=3/2 kT

~80 MK

slide28

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?

slide29

Year 1997.9

P = 2016 d

1 = 50 days

..1..

.5

1994.7

1998.0

slide30

Year 2003.5

P = 2020 d

1 = 7 days

1992.5

1994.7

1998.0

slide31

Year 2009.0

P = 2022.7 d

1 = 1.3 days

.7

1998.0

slide32

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