APOGEE Chemical Abundances of the Sagittarius Dwarf Galaxy

Sten Hasselquist, Matthew Shetrone, Verne Smith, Jon Holtzman, Andrew McWilliam, J. G. Fernández-Trincado, Timothy C. Beers, Steven R. Majewski, David L. Nidever, Baitian Tang, Patricia B. Tissera, Emma Fernández Alvar, Carlos Allende Prieto, Andres Almeida, Borja Anguiano, Giuseppina Battaglia, Leticia Carigi, Gloria Delgado Inglada, Peter Frinchaboy, D. A. Garcia-HernándezDoug Geisler, Dante Minniti, Vinicius M. Placco, Mathias Schultheis, Jennifer Sobeck, Sandro Villanova

Resultado de la investigación: Article

27 Citas (Scopus)

Resumen

The Apache Point Observatory Galactic Evolution Experiment provides the opportunity of measuring elemental abundances for C, N, O, Na, Mg, Al, Si, P, K, Ca, V, Cr, Mn, Fe, Co, and Ni in vast numbers of stars. We analyze thechemical-abundance patterns of these elements for 158 red giant stars belonging to the Sagittarius dwarf galaxy (Sgr). This is the largest sample of Sgr stars with detailed chemical abundances, and it is the first time that C, N, P, K, V, Cr, Co, and Ni have been studied at high resolution in this galaxy. We find that the Sgr stars with [Fe/H] ≈ -0.8 are deficient in all elemental abundance ratios (expressed as [X/Fe]) relative to the Milky Way, suggesting that the Sgr stars observed today were formed from gas that was less enriched by Type II SNe than stars formed in the Milky Way. By examining the relative deficiencies of the hydrostatic (O, Na, Mg, and Al) and explosive (Si, P, K, and Mn) elements, our analysis supports the argument that previous generations of Sgr stars were formed with a top-light initial mass function, one lacking the most massive stars that would normally pollute the interstellar medium with the hydrostatic elements. We use a simple chemical-evolution model, flexCE, to further support our claim and conclude that recent stellar generations of Fornax and the Large Magellanic Cloud could also have formed according to a top-light initial mass function.

Idioma originalEnglish
Número de artículo162
PublicaciónAstrophysical Journal
Volumen845
N.º2
DOI
EstadoPublished - 20 ago 2017

Huella dactilar

dwarf galaxies
stars
hydrostatics
red giant stars
explosive
observatory
chemical evolution
galactic evolution
Magellanic clouds
massive stars
chemical
observatories
gas
galaxies
experiment
high resolution
gases

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

Citar esto

Hasselquist, S., Shetrone, M., Smith, V., Holtzman, J., McWilliam, A., Fernández-Trincado, J. G., ... Villanova, S. (2017). APOGEE Chemical Abundances of the Sagittarius Dwarf Galaxy. Astrophysical Journal, 845(2), [162]. https://doi.org/10.3847/1538-4357/aa7ddc
Hasselquist, Sten ; Shetrone, Matthew ; Smith, Verne ; Holtzman, Jon ; McWilliam, Andrew ; Fernández-Trincado, J. G. ; Beers, Timothy C. ; Majewski, Steven R. ; Nidever, David L. ; Tang, Baitian ; Tissera, Patricia B. ; Alvar, Emma Fernández ; Allende Prieto, Carlos ; Almeida, Andres ; Anguiano, Borja ; Battaglia, Giuseppina ; Carigi, Leticia ; Delgado Inglada, Gloria ; Frinchaboy, Peter ; Garcia-Hernández, D. A. ; Geisler, Doug ; Minniti, Dante ; Placco, Vinicius M. ; Schultheis, Mathias ; Sobeck, Jennifer ; Villanova, Sandro. / APOGEE Chemical Abundances of the Sagittarius Dwarf Galaxy. En: Astrophysical Journal. 2017 ; Vol. 845, N.º 2.
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abstract = "The Apache Point Observatory Galactic Evolution Experiment provides the opportunity of measuring elemental abundances for C, N, O, Na, Mg, Al, Si, P, K, Ca, V, Cr, Mn, Fe, Co, and Ni in vast numbers of stars. We analyze thechemical-abundance patterns of these elements for 158 red giant stars belonging to the Sagittarius dwarf galaxy (Sgr). This is the largest sample of Sgr stars with detailed chemical abundances, and it is the first time that C, N, P, K, V, Cr, Co, and Ni have been studied at high resolution in this galaxy. We find that the Sgr stars with [Fe/H] ≈ -0.8 are deficient in all elemental abundance ratios (expressed as [X/Fe]) relative to the Milky Way, suggesting that the Sgr stars observed today were formed from gas that was less enriched by Type II SNe than stars formed in the Milky Way. By examining the relative deficiencies of the hydrostatic (O, Na, Mg, and Al) and explosive (Si, P, K, and Mn) elements, our analysis supports the argument that previous generations of Sgr stars were formed with a top-light initial mass function, one lacking the most massive stars that would normally pollute the interstellar medium with the hydrostatic elements. We use a simple chemical-evolution model, flexCE, to further support our claim and conclude that recent stellar generations of Fornax and the Large Magellanic Cloud could also have formed according to a top-light initial mass function.",
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Hasselquist, S, Shetrone, M, Smith, V, Holtzman, J, McWilliam, A, Fernández-Trincado, JG, Beers, TC, Majewski, SR, Nidever, DL, Tang, B, Tissera, PB, Alvar, EF, Allende Prieto, C, Almeida, A, Anguiano, B, Battaglia, G, Carigi, L, Delgado Inglada, G, Frinchaboy, P, Garcia-Hernández, DA, Geisler, D, Minniti, D, Placco, VM, Schultheis, M, Sobeck, J & Villanova, S 2017, 'APOGEE Chemical Abundances of the Sagittarius Dwarf Galaxy', Astrophysical Journal, vol. 845, n.º 2, 162. https://doi.org/10.3847/1538-4357/aa7ddc

APOGEE Chemical Abundances of the Sagittarius Dwarf Galaxy. / Hasselquist, Sten; Shetrone, Matthew; Smith, Verne; Holtzman, Jon; McWilliam, Andrew; Fernández-Trincado, J. G.; Beers, Timothy C.; Majewski, Steven R.; Nidever, David L.; Tang, Baitian; Tissera, Patricia B.; Alvar, Emma Fernández; Allende Prieto, Carlos; Almeida, Andres; Anguiano, Borja; Battaglia, Giuseppina; Carigi, Leticia; Delgado Inglada, Gloria; Frinchaboy, Peter; Garcia-Hernández, D. A.; Geisler, Doug; Minniti, Dante; Placco, Vinicius M.; Schultheis, Mathias; Sobeck, Jennifer; Villanova, Sandro.

En: Astrophysical Journal, Vol. 845, N.º 2, 162, 20.08.2017.

Resultado de la investigación: Article

TY - JOUR

T1 - APOGEE Chemical Abundances of the Sagittarius Dwarf Galaxy

AU - Hasselquist, Sten

AU - Shetrone, Matthew

AU - Smith, Verne

AU - Holtzman, Jon

AU - McWilliam, Andrew

AU - Fernández-Trincado, J. G.

AU - Beers, Timothy C.

AU - Majewski, Steven R.

AU - Nidever, David L.

AU - Tang, Baitian

AU - Tissera, Patricia B.

AU - Alvar, Emma Fernández

AU - Allende Prieto, Carlos

AU - Almeida, Andres

AU - Anguiano, Borja

AU - Battaglia, Giuseppina

AU - Carigi, Leticia

AU - Delgado Inglada, Gloria

AU - Frinchaboy, Peter

AU - Garcia-Hernández, D. A.

AU - Geisler, Doug

AU - Minniti, Dante

AU - Placco, Vinicius M.

AU - Schultheis, Mathias

AU - Sobeck, Jennifer

AU - Villanova, Sandro

PY - 2017/8/20

Y1 - 2017/8/20

N2 - The Apache Point Observatory Galactic Evolution Experiment provides the opportunity of measuring elemental abundances for C, N, O, Na, Mg, Al, Si, P, K, Ca, V, Cr, Mn, Fe, Co, and Ni in vast numbers of stars. We analyze thechemical-abundance patterns of these elements for 158 red giant stars belonging to the Sagittarius dwarf galaxy (Sgr). This is the largest sample of Sgr stars with detailed chemical abundances, and it is the first time that C, N, P, K, V, Cr, Co, and Ni have been studied at high resolution in this galaxy. We find that the Sgr stars with [Fe/H] ≈ -0.8 are deficient in all elemental abundance ratios (expressed as [X/Fe]) relative to the Milky Way, suggesting that the Sgr stars observed today were formed from gas that was less enriched by Type II SNe than stars formed in the Milky Way. By examining the relative deficiencies of the hydrostatic (O, Na, Mg, and Al) and explosive (Si, P, K, and Mn) elements, our analysis supports the argument that previous generations of Sgr stars were formed with a top-light initial mass function, one lacking the most massive stars that would normally pollute the interstellar medium with the hydrostatic elements. We use a simple chemical-evolution model, flexCE, to further support our claim and conclude that recent stellar generations of Fornax and the Large Magellanic Cloud could also have formed according to a top-light initial mass function.

AB - The Apache Point Observatory Galactic Evolution Experiment provides the opportunity of measuring elemental abundances for C, N, O, Na, Mg, Al, Si, P, K, Ca, V, Cr, Mn, Fe, Co, and Ni in vast numbers of stars. We analyze thechemical-abundance patterns of these elements for 158 red giant stars belonging to the Sagittarius dwarf galaxy (Sgr). This is the largest sample of Sgr stars with detailed chemical abundances, and it is the first time that C, N, P, K, V, Cr, Co, and Ni have been studied at high resolution in this galaxy. We find that the Sgr stars with [Fe/H] ≈ -0.8 are deficient in all elemental abundance ratios (expressed as [X/Fe]) relative to the Milky Way, suggesting that the Sgr stars observed today were formed from gas that was less enriched by Type II SNe than stars formed in the Milky Way. By examining the relative deficiencies of the hydrostatic (O, Na, Mg, and Al) and explosive (Si, P, K, and Mn) elements, our analysis supports the argument that previous generations of Sgr stars were formed with a top-light initial mass function, one lacking the most massive stars that would normally pollute the interstellar medium with the hydrostatic elements. We use a simple chemical-evolution model, flexCE, to further support our claim and conclude that recent stellar generations of Fornax and the Large Magellanic Cloud could also have formed according to a top-light initial mass function.

KW - galaxies: dwarf

KW - galaxies: individual (Sagittarius dSph)

KW - galaxies: stellar content

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U2 - 10.3847/1538-4357/aa7ddc

DO - 10.3847/1538-4357/aa7ddc

M3 - Article

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SN - 0004-637X

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Hasselquist S, Shetrone M, Smith V, Holtzman J, McWilliam A, Fernández-Trincado JG y otros. APOGEE Chemical Abundances of the Sagittarius Dwarf Galaxy. Astrophysical Journal. 2017 ago 20;845(2). 162. https://doi.org/10.3847/1538-4357/aa7ddc