Lithium in the globular clusters Centauri & M4 Lorenzo Monaco - - PowerPoint PPT Presentation

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lithium in the globular clusters centauri m4
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Lithium in the globular clusters Centauri & M4 Lorenzo Monaco - - PowerPoint PPT Presentation

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Lithium in the globular clusters Centauri & M4 Lorenzo Monaco ESO European Southern Observatory / Santiago (Chile) lmonaco@eso.org Collaborators: P. Bonifacio, S. Villanova, L. Sbordone, E. Caffau, H.-G. Ludwig, et al. Centauri:

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Lithium in the globular clusters ω Centauri & M4

Lorenzo Monaco

ESO – European Southern Observatory / Santiago (Chile)

lmonaco@eso.org

Collaborators: P. Bonifacio, S. Villanova, L. Sbordone,

  • E. Caffau, H.-G. Ludwig, et al.
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ω

ω Centauri: GC or dSph? Centauri: GC or dSph?

ω Centauri is the most massive GC and is commonly considered as the remnant of an accreted dwarf galaxy

Villanova et al 2007

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ω

ω Centauri: GC or dSph? Centauri: GC or dSph?

Villanova et al 2007 Bellazzini et al 2001

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ω

ω Centauri: GC or dSph? Centauri: GC or dSph?

Villanova et al 2007 Johnson et al 2010

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SLIDE 5

ω

ω Centauri: GC or dSph? Centauri: GC or dSph?

Scarpa et al 2003 Majewski et al 2012

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Tolstoy et al. 2009

ω

ω Centauri: Centauri: GC or dSph? GC or dSph?

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The Sgr dSph

The Sgr dSph

M54 Majewski et al. 2003

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M54 + Sgr Nucleus &

M54 + Sgr Nucleus & ω ω Centauri Centauri

Siegel et al. 2007

M54 ωCen

Villanova et al 2007

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Monaco et al., 2010

The Lithium content of ω Cen

  • FLAMES/VLT
  • About 100 targets up to V=18
  • Safe detection of the Li

resonance doublet

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Monaco et al. 2010

ω ω Cen stars have Cen stars have Li abundances close Li abundances close to the Spite plateau to the Spite plateau The Lithium content of ω Cen The 1st (stellar) Lithium measure in an extra-galactic stellar system?

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Monaco et al. 2010

The Lithium content of ω Cen

  • Issue for solutions
  • f the cosmological

Li problem through pre-processing of Galactic material through massive Pop III stars (Piau et al. 2006)

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Li in Galactic globular clusters: The case of M4

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Na vs O in Galactic globular clusters: The case of M4 Marino et al. 2008

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Li vs Na in Galactic globular clusters

47Tuc NGC6752

Pasquini et al. 2005

Bonifacio et al. 2007

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Li vs Na in Galactic globular clusters

  • Fast rotating massive stars (FRMS)

→destruction of the original Li content

  • Massive AGB stars

→may have an important lithium yield

  • Li production tend to erase the Na vs Li anti-

correlation

Possible polluters of the gas from which the second generation of stars formed in GCs:

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Li in Galactic globular clusters: The case of M4 Monaco et al. 2012

  • Search for a Na vs Li

anti-correlation

  • P85 – FLAMES/VLT
  • About 90 targets up to

V=17

  • Safe detection of the

Li resonance doublet

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A Li-rich dwarfs in the Globular Cluster M4 Monaco et al. 2012

  • We detected a dwarf

in M4 having a Li content compatible with the cosmological value

  • Is it really the

primordial Li or is it a case of pollution?

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SLIDE 18

A Li-rich dwarfs in the Globular Cluster M4 Monaco et al. 2012

  • The shallow slope of

the A(Li) vs A(Na) anti-correlation suggests Li production in place

  • #37394 has a high Na

content: it is a 2

nd

generation star

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SLIDE 19

D'orazi & Marino, 2010 Mucciarelli et al. 2011

Giants

Li – O – Na in M4 giants and dwarfs

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A Li-rich dwarfs in the Globular Cluster M4 Monaco et al. 2012

Where can pollution come from?

  • Pollution from a now

evolved companion which produced Li?

  • Pollution from massive AGB

stars?

  • Primordial scenario cannot

be discarded