Astronomy and Astrophysics – Astrophysics
Scientific paper
2008-02-11
Astronomy and Astrophysics
Astrophysics
To be published on A&A
Scientific paper
10.1051/0004-6361:20078837
Aims: Aluminium is a key element to constrain the models of the chemical enrichment and the yields of the first supernovae. But obtaining precise Al abundances in extremely metal-poor (EMP) stars requires that the non-LTE effects be carefully taken into account. Methods: The NLTE profiles of the blue resonance aluminium lines have been computed in a sample of 53 extremely metal-poor stars with a modified version of the program MULTI applied to an atomic model of the Al atom with 78 levels of Al I and 13 levels of Al II, and compared to the observations. Results: With these new determinations, all the stars of the sample show a ratio Al/Fe close to the solar value: [Al/Fe] =-0.06 +- 0.10 with a very small scatter. These results are compared to the models of the chemical evolution of the halo using different models of SN II and are compatible with recent computations. The sodium-rich giants are not found to be also aluminium-rich and thus, as expected, the convection in these giants only brings to the surface the products of the Ne-Na cycle.
Andrievsky Sergei. M.
Bonifacio Piercarlo
Cayrel Roger
François Patrick
Hill Vanessa
No associations
LandOfFree
NLTE determination of the aluminium abundance in a homogeneous sample of extremely metal-poor stars does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with NLTE determination of the aluminium abundance in a homogeneous sample of extremely metal-poor stars, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and NLTE determination of the aluminium abundance in a homogeneous sample of extremely metal-poor stars will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-107568