APOGEE [C/N] Abundances across the Galaxy: Migration and Infall from Red Giant Ages
APOGEE [C/N] Abundances across the Galaxy: Migration and Infall from Red Giant Ages
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APOGEE [C/N] 银河系的丰度：红巨星时代的迁移和陨落
DOI：
10.3847/1538-4357/aaf859
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发表时间：
2018
期刊：
影响因子：
--
通讯作者：
O. Zamora
中科院分区：
文献类型：
--
作者：
S. Hasselquist;J. Holtzman;M. Shetrone;J. Tayar;D. Weinberg;D. Feuillet;K. Cunha;M. Pinsonneault;Jennifer A. Johnson;J. Bird;T. Beers;R. Schiavon;I. Minchev;J. G. Fern'andez;D. A. Garc'ia;C. Nitschelm;O. Zamora
本文介绍了SDSS-IV Apache Point Observatory银河演化实验巡天数据发布14（DR 14）中银河系红巨星分支恒星（3 kpc < R < 15 kpc）的[C/N]-[Fe/H]丰度趋势。碳氮比（通常表示为[C/N]）可以指示红巨星星星的质量，从中可以推断年龄。使用Martig等人推导出的质量和年龄，我们证明，我们能够解释DR 14 [C/N]-[Fe/H]丰度分布作为年龄-[Fe/H]空间的趋势。我们的研究结果表明，年龄和金属丰度之间的关系，这是由简单的化学演化模型预测，是不存在于任何银河带。远离平面（kpc）的恒星在[C/N]（<$−0.04 dex kpc−1）上表现出径向梯度。[C/N]分散度向平面方向增加（在kpc处σ[C/N] = 0.13，在ε Z ε < 0.5 kpc处σ[C/N] = 0.18 dex）。我们测量了最年轻恒星（年龄< 2.5 Gyr）的盘金属丰度梯度为−0.060 dex kpc−1，从6到12 kpc，这与Anders等人使用年轻CoRoGEE恒星发现的梯度一致。我们还发现，径向迁移是一个合理的解释所观察到的上升的[C/N]-[Fe/H]丰度的趋势，在银河系外，富金属恒星的[C/N]相对增强。
We present [C/N]–[Fe/H] abundance trends from the SDSS-IV Apache Point Observatory Galactic Evolution Experiment survey, Data Release 14 (DR14), for red giant branch stars across the Milky Way (3 kpc < R < 15 kpc). The carbon-to-nitrogen ratio (often expressed as [C/N]) can indicate the mass of a red giant star, from which an age can be inferred. Using masses and ages derived by Martig et al., we demonstrate that we are able to interpret the DR14 [C/N]–[Fe/H] abundance distributions as trends in age–[Fe/H] space. Our results show that an anticorrelation between age and metallicity, which is predicted by simple chemical evolution models, is not present at any Galactic zone. Stars far from the plane ( kpc) exhibit a radial gradient in [C/N] (∼−0.04 dex kpc−1). The [C/N] dispersion increases toward the plane (σ[C/N] = 0.13 at kpc to σ[C/N] = 0.18 dex at ∣Z∣ < 0.5 kpc). We measure a disk metallicity gradient for the youngest stars (age < 2.5 Gyr) of −0.060 dex kpc−1 from 6 to 12 kpc, which is in agreement with the gradient found using young CoRoGEE stars by Anders et al. Older stars exhibit a flatter gradient (−0.016 dex kpc−1), which is predicted by simulations in which stars migrate from their birth radii. We also find that radial migration is a plausible explanation for the observed upturn of the [C/N]–[Fe/H] abundance trends in the outer Galaxy, where the metal-rich stars are relatively enhanced in [C/N].
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DOI：
10.1051/0004-6361/201629363
发表时间：
2016-08
期刊：
arXiv: Astrophysics of Galaxies
影响因子：
--
作者：
F. Anders;C. Chiappini;I. Minchev;A. Miglio;J. Montalbán;B. Mosser;T. Rodrigues;T. Rodrigues
通讯作者：
F. Anders;C. Chiappini;I. Minchev;A. Miglio;J. Montalbán;B. Mosser;T. Rodrigues;T. Rodrigues
影响因子：
4.8
作者：
I. Minchev;F. Anders;A. Recio-Blanco;C. Chiappini;P. Laverny;A. Queiroz;Matthias Steinmetz;
通讯作者：
I. Minchev;F. Anders;A. Recio-Blanco;C. Chiappini;P. Laverny;A. Queiroz;Matthias Steinmetz;
DOI：
10.3847/0004-637x/831/2/139
发表时间：
2016-09
期刊：
The Astrophysical Journal
影响因子：
--
作者：
M. Martig;I. Minchev;M. Ness;M. Fouesneau;H. Rix
通讯作者：
M. Martig;I. Minchev;M. Ness;M. Fouesneau;H. Rix
DOI：
10.3847/1538-4357/834/1/27
发表时间：
2016-08
期刊：
The Astrophysical Journal
影响因子：
--
作者：
I. Minchev;M. Steinmetz;C. Chiappini;M. Martig;F. Anders;G. Matijevič;R. D. Jong
通讯作者：
I. Minchev;M. Steinmetz;C. Chiappini;M. Martig;F. Anders;G. Matijevič;R. D. Jong
影响因子：
5.3
作者：
Blanton, Michael R.;Bershady, Matthew A.;Zou, Hu
通讯作者：
Zou, Hu