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Journal Article

APOGEE [C/N] Abundances across the Galaxy: Migration and Infall from Red Giant Ages

MPS-Authors

Hasselquist,  Sten
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Holtzman,  Jon A.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Shetrone,  Matthew
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Tayar,  Jamie
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Weinberg,  David H.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Feuillet,  Diane
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Cunha,  Katia
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Pinsonneault,  Marc H.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Johnson,  Jennifer A.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Bird,  Jonathan
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Beers,  Timothy C.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Schiavon,  Ricardo
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Minchev,  Ivan
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Fernández-Trincado,  J. G.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

García-Hernández,  D. A.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Nitschelm,  Christian
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Zamora,  Olga
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

External Resource

https://ui.adsabs.harvard.edu/abs/2019ApJ...871..181H
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Citation

Hasselquist, S., Holtzman, J. A., Shetrone, M., Tayar, J., Weinberg, D. H., Feuillet, D., et al. (2019). APOGEE [C/N] Abundances across the Galaxy: Migration and Infall from Red Giant Ages. The Astrophysical Journal, 871.


Cite as: https://hdl.handle.net/21.11116/0000-0005-D100-E
Abstract
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 (| Z| > 1 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 | Z| > 1 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].