Through thick and thin: Structure of the Galactic thick disc from extragalactic surveys
نویسندگان
چکیده
منابع مشابه
Thin and Thick Galactic Disks
Studies of elemental abundances in stars belonging to the thin and the thick disk of our Galaxy are reviewed. Edvardsson et al. (1993) found strong evidence of [α/Fe] variations among F and G main sequence stars with the same [Fe/H] and interpreted these differences as due to radial gradients in the star formation rate in the Galactic disk. Several recent studies suggest, however, that the diff...
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We distinguish between two categories of belief — thin belief and thick belief — and provide evidence that they approximate genuinely distinct categories within folk psychology. We use the distinction to make informative predictions about how laypeople view the relationship between knowledge and belief. More specifcally, we show that if the distinction is genuine, then we can make sense of othe...
متن کاملThe Relative Age of the Thin and Thick Galactic Disks
We determine the relative ages of the open cluster NGC 188 and selected Hipparcos field stars by isochrone fitting, and compare them to the age of the thick disk globular cluster 47 Tuc. The best fit age for NGC 188 was determined to be 6.5 ±1.0 Gyr. The solar metallicity Hipparcos field stars yielded a slightly older thin disk age, 7.5 ±0.7 Gyr. Two slightly metal-poor ([Fe/H] = −0.22) field s...
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ژورنال
عنوان ژورنال: Astronomy & Astrophysics
سال: 2013
ISSN: 0004-6361,1432-0746
DOI: 10.1051/0004-6361/201321470