SIMBAD references

2007ApJ...659L..25M - Astrophys. J., 659, L25-L28 (2007/April-2)

Magnesium isotopes in metal-poor dwarfs: the rise of AGB stars and the formation timescale of the Galactic halo.

MELENDEZ J. and COHEN J.G.

Abstract (from CDS):

We have determined magnesium isotopic ratios (25,26Mg/Mg) in metal-poor (-2.6 ≤ [Fe/H] ≤ -1.3) halo dwarfs employing high signal-to-noise ratio (S/N = 90-280), high spectral resolution (R=105) Keck High Resolution Echelle Spectrometer (HIRES) spectra. Unlike previous claims of an important contribution from intermediate-mass asymptotic giant branch (AGB) stars at low metallicities, we find that the rise of the AGB contribution in the Galactic halo did not occur until intermediate metallicities ([Fe/H] ≳ -1.5).

Abstract Copyright: ∼

Journal keyword(s): Galaxy: Halo - Stars: Abundances - Stars: AGB and Post-AGB - Stars: Atmospheres - Stars: Population II

Simbad objects: 9

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