2009
DOI: 10.1007/s10509-009-0051-5
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Oxygen abundance in local disk and bulge: chemical evolution with a strictly universal IMF

Abstract: This paper has two parts: one about observational constraints related to the empirical differential oxygen abundance distribution (EDOD), and the other about inhomogeneous models of chemical evolution, in particular the theoretical differential oxygen abundance distribution (TDOD). In the first part, the EDOD is deduced from subsamples related to two different samples involving (i) N=532 solar neighbourhood (SN) stars within the range, -1.5<[Fe/H]<0.5, for which the oxygen abundance has been determined both in… Show more

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Cited by 2 publications
(5 citation statements)
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References 63 publications
(153 reference statements)
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“…On the other hand, the latter value would be against a thick disk -thin disk collapse, unless a massive thick disk (with respect to the thin disk) is recognized. Finally, if a single (thick + thin) disk population exists, the EDOD maintains close to its counterpart inferred both from the PM11n sample, due to the smallness of the PM11k sample, and from the Ra07n sample, as shown in an earlier attempt (Caimmi and Milanese 2009). The family of TDOD curves, considered for each stage of evolution, is characterized by two common points, (φ i , ψ i ), (φ f , ψ f ), which make the boundary of the related linear fit.…”
Section: Discussionsupporting
confidence: 72%
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“…On the other hand, the latter value would be against a thick disk -thin disk collapse, unless a massive thick disk (with respect to the thin disk) is recognized. Finally, if a single (thick + thin) disk population exists, the EDOD maintains close to its counterpart inferred both from the PM11n sample, due to the smallness of the PM11k sample, and from the Ra07n sample, as shown in an earlier attempt (Caimmi and Milanese 2009). The family of TDOD curves, considered for each stage of evolution, is characterized by two common points, (φ i , ψ i ), (φ f , ψ f ), which make the boundary of the related linear fit.…”
Section: Discussionsupporting
confidence: 72%
“…The latter alternative is in contradiction with current observations, which seem to exclude the presence of a massive thick disk, while the former remains available on this respect. If thick disk and thin disk stars belong to a single population (e.g., Bovy et al 2012), no prediction can be made for or against a thick disk -thin disk collapse and the TDOD is expected to be slightly different from its counterpart related to the thin disk (Caimmi and Milanese 2009).…”
Section: Resultsmentioning
confidence: 99%
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“…With regard to the Galaxy, the empirical differential oxygen abundance distribution (EDOD) shows that (i) at least two different stages of (chemical) evolution exist, and (ii) each stage can be described using an extended simple CB model, for both the inner halo (C07), the bulge (C07), the thick disk (Caimmi and Milanese 2009, hereafter quoted as CM09), and the thin disk (CM09). In particular, the earlier stage is marked by an initially increasing EDOD.…”
Section: Introductionmentioning
confidence: 99%