Chemical Cartography with APOGEE: Multi-element Abundance Ratios

David H. Weinberg, Jon A. Holtzman, Sten Hasselquist, Jonathan C. Bird, Jennifer A. Johnson, Matthew Shetrone, Jennifer Sobeck, Carlos Allende Prieto, Dmitry Bizyaev, Ricardo Carrera, Roger E. Cohen, Katia Cunha, Garrett Ebelke, J. G. Fernandez-Trincado, D. A. Garcia-Hernández, Christian R. Hayes, Henrik Jönsson, Richard R. Lane, Steven R. Majewski, Viktor MalanushenkoSzabolcs Mészáros, David L. Nidever, Christian Nitschelm, Kaike Pan, Hans Walter Rix, Jan Rybizki, Ricardo P. Schiavon, Donald P. Schneider, John C. Wilson, Olga Zamora

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

We map the trends of elemental abundance ratios across the Galactic disk, spanning R = 3-15 kpc and midplane distance |Z| = 0-2 kpc, for 15 elements in a sample of 20,485 stars measured by the SDSS/APOGEE survey (O, Na, Mg, Al, Si, P, S, K, Ca, V, Cr, Mn, Fe, Co, Ni). Adopting Mg rather than Fe as our reference element, and separating stars into two populations based on [Fe/Mg], we find that the median trends of [X/Mg] versus [Mg/H] in each population are nearly independent of location in the Galaxy. The full multi-element cartography can be summarized by combining these nearly universal median sequences with our measured metallicity distribution functions and the relative proportions of the low-[Fe/Mg] (high-α) and high-[Fe/Mg] (low-α) populations, which depend strongly on R and |Z|. We interpret the median sequences with a semi-empirical two-process model that describes both the ratio of core collapse and Type Ia supernova (SN Ia) contributions to each element and the metallicity dependence of the supernova yields. These observationally inferred trends can provide strong tests of supernova nucleosynthesis calculations. Our results lead to a relatively simple picture of abundance ratio variations in the Milky Way, in which the trends at any location can be described as the sum of two components with relative contributions that change systematically and smoothly across the Galaxy. Deviations from this picture and future extensions to other elements can provide further insights into the physics of stellar nucleosynthesis and unusual events in the Galaxys history.

Original languageEnglish (US)
Article number102
JournalAstrophysical Journal
Volume874
Issue number1
DOIs
StatePublished - Mar 20 2019

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cartography
supernovae
trends
nuclear fusion
metallicity
galaxies
stars
proportion
physics
distribution functions
histories
deviation
trend
chemical
history

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Weinberg, D. H., Holtzman, J. A., Hasselquist, S., Bird, J. C., Johnson, J. A., Shetrone, M., ... Zamora, O. (2019). Chemical Cartography with APOGEE: Multi-element Abundance Ratios. Astrophysical Journal, 874(1), [102]. https://doi.org/10.3847/1538-4357/ab07c7
Weinberg, David H. ; Holtzman, Jon A. ; Hasselquist, Sten ; Bird, Jonathan C. ; Johnson, Jennifer A. ; Shetrone, Matthew ; Sobeck, Jennifer ; Allende Prieto, Carlos ; Bizyaev, Dmitry ; Carrera, Ricardo ; Cohen, Roger E. ; Cunha, Katia ; Ebelke, Garrett ; Fernandez-Trincado, J. G. ; Garcia-Hernández, D. A. ; Hayes, Christian R. ; Jönsson, Henrik ; Lane, Richard R. ; Majewski, Steven R. ; Malanushenko, Viktor ; Mészáros, Szabolcs ; Nidever, David L. ; Nitschelm, Christian ; Pan, Kaike ; Rix, Hans Walter ; Rybizki, Jan ; Schiavon, Ricardo P. ; Schneider, Donald P. ; Wilson, John C. ; Zamora, Olga. / Chemical Cartography with APOGEE : Multi-element Abundance Ratios. In: Astrophysical Journal. 2019 ; Vol. 874, No. 1.
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abstract = "We map the trends of elemental abundance ratios across the Galactic disk, spanning R = 3-15 kpc and midplane distance |Z| = 0-2 kpc, for 15 elements in a sample of 20,485 stars measured by the SDSS/APOGEE survey (O, Na, Mg, Al, Si, P, S, K, Ca, V, Cr, Mn, Fe, Co, Ni). Adopting Mg rather than Fe as our reference element, and separating stars into two populations based on [Fe/Mg], we find that the median trends of [X/Mg] versus [Mg/H] in each population are nearly independent of location in the Galaxy. The full multi-element cartography can be summarized by combining these nearly universal median sequences with our measured metallicity distribution functions and the relative proportions of the low-[Fe/Mg] (high-α) and high-[Fe/Mg] (low-α) populations, which depend strongly on R and |Z|. We interpret the median sequences with a semi-empirical two-process model that describes both the ratio of core collapse and Type Ia supernova (SN Ia) contributions to each element and the metallicity dependence of the supernova yields. These observationally inferred trends can provide strong tests of supernova nucleosynthesis calculations. Our results lead to a relatively simple picture of abundance ratio variations in the Milky Way, in which the trends at any location can be described as the sum of two components with relative contributions that change systematically and smoothly across the Galaxy. Deviations from this picture and future extensions to other elements can provide further insights into the physics of stellar nucleosynthesis and unusual events in the Galaxys history.",
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Weinberg, DH, Holtzman, JA, Hasselquist, S, Bird, JC, Johnson, JA, Shetrone, M, Sobeck, J, Allende Prieto, C, Bizyaev, D, Carrera, R, Cohen, RE, Cunha, K, Ebelke, G, Fernandez-Trincado, JG, Garcia-Hernández, DA, Hayes, CR, Jönsson, H, Lane, RR, Majewski, SR, Malanushenko, V, Mészáros, S, Nidever, DL, Nitschelm, C, Pan, K, Rix, HW, Rybizki, J, Schiavon, RP, Schneider, DP, Wilson, JC & Zamora, O 2019, 'Chemical Cartography with APOGEE: Multi-element Abundance Ratios', Astrophysical Journal, vol. 874, no. 1, 102. https://doi.org/10.3847/1538-4357/ab07c7

Chemical Cartography with APOGEE : Multi-element Abundance Ratios. / Weinberg, David H.; Holtzman, Jon A.; Hasselquist, Sten; Bird, Jonathan C.; Johnson, Jennifer A.; Shetrone, Matthew; Sobeck, Jennifer; Allende Prieto, Carlos; Bizyaev, Dmitry; Carrera, Ricardo; Cohen, Roger E.; Cunha, Katia; Ebelke, Garrett; Fernandez-Trincado, J. G.; Garcia-Hernández, D. A.; Hayes, Christian R.; Jönsson, Henrik; Lane, Richard R.; Majewski, Steven R.; Malanushenko, Viktor; Mészáros, Szabolcs; Nidever, David L.; Nitschelm, Christian; Pan, Kaike; Rix, Hans Walter; Rybizki, Jan; Schiavon, Ricardo P.; Schneider, Donald P.; Wilson, John C.; Zamora, Olga.

In: Astrophysical Journal, Vol. 874, No. 1, 102, 20.03.2019.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Chemical Cartography with APOGEE

T2 - Multi-element Abundance Ratios

AU - Weinberg, David H.

AU - Holtzman, Jon A.

AU - Hasselquist, Sten

AU - Bird, Jonathan C.

AU - Johnson, Jennifer A.

AU - Shetrone, Matthew

AU - Sobeck, Jennifer

AU - Allende Prieto, Carlos

AU - Bizyaev, Dmitry

AU - Carrera, Ricardo

AU - Cohen, Roger E.

AU - Cunha, Katia

AU - Ebelke, Garrett

AU - Fernandez-Trincado, J. G.

AU - Garcia-Hernández, D. A.

AU - Hayes, Christian R.

AU - Jönsson, Henrik

AU - Lane, Richard R.

AU - Majewski, Steven R.

AU - Malanushenko, Viktor

AU - Mészáros, Szabolcs

AU - Nidever, David L.

AU - Nitschelm, Christian

AU - Pan, Kaike

AU - Rix, Hans Walter

AU - Rybizki, Jan

AU - Schiavon, Ricardo P.

AU - Schneider, Donald P.

AU - Wilson, John C.

AU - Zamora, Olga

PY - 2019/3/20

Y1 - 2019/3/20

N2 - We map the trends of elemental abundance ratios across the Galactic disk, spanning R = 3-15 kpc and midplane distance |Z| = 0-2 kpc, for 15 elements in a sample of 20,485 stars measured by the SDSS/APOGEE survey (O, Na, Mg, Al, Si, P, S, K, Ca, V, Cr, Mn, Fe, Co, Ni). Adopting Mg rather than Fe as our reference element, and separating stars into two populations based on [Fe/Mg], we find that the median trends of [X/Mg] versus [Mg/H] in each population are nearly independent of location in the Galaxy. The full multi-element cartography can be summarized by combining these nearly universal median sequences with our measured metallicity distribution functions and the relative proportions of the low-[Fe/Mg] (high-α) and high-[Fe/Mg] (low-α) populations, which depend strongly on R and |Z|. We interpret the median sequences with a semi-empirical two-process model that describes both the ratio of core collapse and Type Ia supernova (SN Ia) contributions to each element and the metallicity dependence of the supernova yields. These observationally inferred trends can provide strong tests of supernova nucleosynthesis calculations. Our results lead to a relatively simple picture of abundance ratio variations in the Milky Way, in which the trends at any location can be described as the sum of two components with relative contributions that change systematically and smoothly across the Galaxy. Deviations from this picture and future extensions to other elements can provide further insights into the physics of stellar nucleosynthesis and unusual events in the Galaxys history.

AB - We map the trends of elemental abundance ratios across the Galactic disk, spanning R = 3-15 kpc and midplane distance |Z| = 0-2 kpc, for 15 elements in a sample of 20,485 stars measured by the SDSS/APOGEE survey (O, Na, Mg, Al, Si, P, S, K, Ca, V, Cr, Mn, Fe, Co, Ni). Adopting Mg rather than Fe as our reference element, and separating stars into two populations based on [Fe/Mg], we find that the median trends of [X/Mg] versus [Mg/H] in each population are nearly independent of location in the Galaxy. The full multi-element cartography can be summarized by combining these nearly universal median sequences with our measured metallicity distribution functions and the relative proportions of the low-[Fe/Mg] (high-α) and high-[Fe/Mg] (low-α) populations, which depend strongly on R and |Z|. We interpret the median sequences with a semi-empirical two-process model that describes both the ratio of core collapse and Type Ia supernova (SN Ia) contributions to each element and the metallicity dependence of the supernova yields. These observationally inferred trends can provide strong tests of supernova nucleosynthesis calculations. Our results lead to a relatively simple picture of abundance ratio variations in the Milky Way, in which the trends at any location can be described as the sum of two components with relative contributions that change systematically and smoothly across the Galaxy. Deviations from this picture and future extensions to other elements can provide further insights into the physics of stellar nucleosynthesis and unusual events in the Galaxys history.

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Weinberg DH, Holtzman JA, Hasselquist S, Bird JC, Johnson JA, Shetrone M et al. Chemical Cartography with APOGEE: Multi-element Abundance Ratios. Astrophysical Journal. 2019 Mar 20;874(1). 102. https://doi.org/10.3847/1538-4357/ab07c7