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Chemical Abundances in Metal-Rich Bulge-like Stars

机译:金属浓凸起恒星的化学丰富

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We have derived chemical abundances for Ca, Ti, Si, Mg, O, Na, Al, Ni, Co and Cr for a sample of stars with peculiar kinematics and probable origin near the bulge. Our sample stars are in the metallicity range = -0.8 [Fe/H] +0.6 dex, and have small pericentric distances, Rp ≤ 3.5 kpc, small scale height, with Z_(max) < 0.16 kpc, and old ages, 9 to 11 Gyr. We have found that the abundance distributions of O, Mg and Al lie between bulge and both thin and thick disks distributions, i. e., with an enhanced pattern relative to thin and thick disk stars, and an underabundant behavior compared to bulge stars. [Na/Fe] ratios ovelarp the bulge distribution in the metal-poor tail, and show similar values compared to thin and thick disk stars for the super-solar metallicity range. Ca, Ti and Si values are similar to those of the thick disk stars in the metal-poor range, while an underabundant behavior is seen relative to thin disk stars for metallicities [Fe/H] > +0.3 dex. Compared to bulge stars, such elements are deficient in our sample stas. For the iron-peak elements Cr and Ni we have found a slightly overabundant behavior relative to both thin and thick disks distributions in the metal-poor range, and a smooth decreasing trend for [Cr/Fe] for stars in the supersolar regime. [Co/Fe] ratios track the solar value in the metal-poor range, and show an underabundant behavior relative do thin disk stars for metallicities [Fe/H] > 0.0 dex.
机译:我们为Ca,Ti,Si,Mg,O,Na,Al,Ni,Co和Cr衍生出来的化学质量,用于具有特殊运动学的恒星样本和凸起附近的可能起源。我们的样本恒星位于金属间范围= -0.8 [Fe / h] + 0.6°,并具有小的终点,RP≤3.5kpc,小规模高,z_(max)<0.16 kpc,老年,9岁11 Gyr。我们发现O,Mg和Al的丰富分布位于凸起和薄粗磁盘分布,I。即,具有相对于薄圆形恒星的增强图案,与凸起恒星相比,具有额外的行为。 [Na / Fe]比率ovelarp在金属尾部的凸起分布,与超太阳能金属度范围相比,与薄圆盘恒星相比,显示了类似的值。 CA,Ti和Si值类似于金属差范围内的厚盘恒星的恒星,而相对于金属化的薄圆盘恒星,可以看到遗漏的行为[Fe / h]> +0.3德克斯。与凸起星星相比,我们的样本STA的这些元素缺乏。对于铁峰元素Cr和Ni,我们已经发现了相对于金属差的薄片和厚圆盘分布的略微过遍的行为,以及超极性方案中恒星的恒星的平滑降低趋势。 [CO / FE]比率跟踪金属差的范围内的太阳能值,并显示出弱的行为相对于金属性[Fe / h]> 0.0 dex的薄盘恒星。

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