Magnetic-resonance pelvimetry in breech presentation

Loon, AJ van; Mantingh, A.

doi:10.1016/s0140-6736(05)70334-2

Cited by 3 publications

(3 citation statements)

References 4 publications

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“…Several different Spitzer programmes have obtained mid-infrared spectroscopy of AGB stars in the local group. The description below refers mainly to works published in Zijlstra et al (2006); Matsuura et al (2006), Groenewegen et al (2007), Lagadec et al (2007) and Sloan et al (2006Sloan et al ( , 2008 for carbon-rich stars in the Magellanic Clouds (27 stars in the LMC and 33 in the SMC) and van Loon et al (1999) for the oxygen-rich stars in the LMC (26 objects). Matsuura et al (2007) for three AGB stars Fornax and Lagadec et al (2008) for six others in the Sagittarius Dwarf spheroidal galaxy.…”

Section: Sample Selectionmentioning

confidence: 99%

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The trigger of the asymptotic giant branch superwind: the importance of carbon

Lagadec

Zijlstra

2008

Monthly Notices of the Royal Astronomical Society: Letters

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The driving mechanism of the asymptotic giant branch (AGB) superwind has become controversial in recent years. The efficacy of dust‐driven mass loss has been queried. Spitzer observation of AGB stars in local group galaxies shows the surprising result that at low metallicity, AGB mass loss occurs at low luminosity, possibly lower than in the Galaxy, but only for carbon‐rich stars. Oxygen‐rich stars in the Galaxy and in lower metallicity galaxies have similar mass‐loss rates only at high luminosities. To explain this dichotomy, we propose that the superwind has a dual trigger. The superwind starts either when sufficient excess carbon builds up for efficient formation of carbonaceous dust [which we propose occurs when XCO= (C − O)/O⊙= 0.1], or when the luminosity reaches a value sufficient for a silicate dust‐driven wind (proposed at L= 104Z−4/3 L⊙). We show that this dual trigger fits the current observational constraints: the luminosity at which the superwind begins, and the predominance of carbon superwind star at low metallicity. We use stellar evolution models to check the consistency of our explanations and present detailed predictions of the luminosities at which the superwind is triggered for different metallicities and initial stellar masses.

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Section: Sample Selectionmentioning

confidence: 99%

“…3. We added the oxygen-rich stars sample from van Loon et al (1999) and the well-studied Galactic carbon star IRC+10216. The figure shows that the mass-loss rates are highest for the LMC stars, and tends to be lower for the SMC.…”

Section: Mass-loss Ratesmentioning

confidence: 99%

The trigger of the asymptotic giant branch superwind: the importance of carbon

Lagadec

Zijlstra

2008

Monthly Notices of the Royal Astronomical Society: Letters

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“…The exploitation of the IRAS catalogue is still on-going. IRAS discovered 50 obscured AGB stars in the LMC and 25 in the SMC (van Loon et al 1999 Habing (1989). Regions occupied by AGB stars of a different type and with a different dust shell thickness were identified, as well as the region where Planetary Nebulae (PNe), the successors of AGB stars, are found.…”

Section: Mid-ir Space Observationsmentioning

confidence: 99%

IR imaging surveys of AGB stars in the Magellanic Clouds

Cioni

2009

EAS Publications Series

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AGB stars are ideal IR targets because they are cool and bright. Most of them escaped detection in optical or shallow IR surveys in the eighties contributing to the puzzling missing number of AGB stars with respect to theoretical predictions and former stages of evolution. Observations and AGB models have advanced steadily in the following decades providing us with an almost complete view of the AGB stars in the Magellanic Clouds. Their properties are tracers of structure and chemistry across galaxies. New surveys will be able to fill-in the gaps, in terms of sensitivity and monitoring, providing new constraints for the formation and evolution of the Magellanic Clouds.

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