منابع مشابه
**title** Asp Conference Series, Vol. **volume**, **publication Year** **editors** Chemical Inhomogeneities and Pulsation
Major improvements in models of chemically peculiar stars have been achieved in the past few years. With these new models it has been possible to test quantitatively some of the processes involved in the formation of abundance anomalies and their effect on stellar structure. The models of metallic A (Am) stars have shown that a much deeper mixing has to be present to account for observed abunda...
متن کاملChemical Abundance Inhomogeneities in Globular Cluster Stars
It is now clear that abundance variations from star-to-star among the light elements, particularly C, N, O, Na and Al, are ubiquitous within galactic globular clusters; they appear seen whenever data of high quality is obtained for a sufficiently large sample of stars within such a cluster. The correlations and anti-correlations among these elements and the range of variation of each element ap...
متن کاملStructural analysis of chemical and topological inhomogeneities by ASAXS
From ASAXS measurements partial pair correlations can be determined both in the fluctuations Aci(r) = ci(r) Ei of the local concentrations ci(r) = ni(r)/n(r) of the ith species and in the fluctuations An(r) = n(r) ii of the local number density of all kinds of atoms. This requires a separation of the measured intensity into partial intensities which depend linearly on the squared average atomic...
متن کاملChemical Inhomogeneities in the Milky Way Stellar Halo
We have compiled a sample of 699 stars from the recent literature with detailed chemical abundance information (spanning −4.2 . [Fe/H] . +0.3), and we compute their space velocities and Galactic orbital parameters. We identify members of the inner and outer stellar halo populations in our sample based only on their kinematic properties and then compare the abundance ratios of these populations ...
متن کامل8 - Stellar Pulsation and Oscillation
That some stars vary in brightness has been known from time immemorial. That this variation is the result of intrinsic changes in the star itself has been known for less than 100 years and the causes of those variations have been understood for less than 30 years. It is not a simple matter to distinguish the light variations resulting from eclipses by a companion from those caused by physical c...
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ژورنال
عنوان ژورنال: International Astronomical Union Colloquium
سال: 2002
ISSN: 0252-9211
DOI: 10.1017/s0252921100016201