DISCOVERY of A METAL-POOR FIELD GIANT with A GLOBULAR CLUSTER SECOND-GENERATION ABUNDANCE PATTERN

J. G. Fernández-Trincado, A. C. Robin, E. Moreno, R. P. Schiavon, A. E.García Pérez, K. Vieira, K. Cunha, O. Zamora, C. Sneden, Diogo Souto, R. Carrera, J. A. Johnson, M. Shetrone, G. Zasowski, D. A. García-Hernández, S. R. Majewski, C. Reylé, S. Blanco-Cuaresma, L. A. Martinez-Medina, A. Pérez-VillegasO. Valenzuela, B. Pichardo, A. Meza, Sz Mészáros, J. Sobeck, D. Geisler, F. Anders, M. Schultheis, B. Tang, A. Roman-Lopes, R. E. Mennickent, K. Pan, C. Nitschelm, F. Allard

Resultado de la investigación: Article

25 Citas (Scopus)

Resumen

We report on the detection, from observations obtained with the Apache Point Observatory Galactic Evolution Experiment spectroscopic survey, of a metal-poor ([Fe/H] = -1.3 dex) field giant star with an extreme Mg-Al abundance ratio ([Mg/Fe] = -0.31 dex; [Al/Fe] = 1.49 dex). Such low Mg/Al ratios are seen only among the second-generation population of globular clusters (GCs) and are not present among Galactic disk field stars. The light-element abundances of this star, 2M16011638-1201525, suggest that it could have been born in a GC. We explore several origin scenarios, studying the orbit of the star in particular to check the probability of its being kinematically related to known GCs. We performed simple orbital integrations assuming the estimated distance of 2M16011638-1201525 and the available six-dimensional phase-space coordinates of 63 GCs, looking for close encounters in the past with a minimum distance approach within the tidal radius of each cluster. We found a very low probability that 2M16011638-1201525 was ejected from most GCs; however, we note that the best progenitor candidate to host this star is GC ω Centauri (NGC 5139). Our dynamical investigation demonstrates that 2M16011638-1201525 reaches a distance from the Galactic plane and minimum and maximum approaches to the Galactic center of R min < 0.62 kpc and R max < 7.26 kpc in an eccentric (e ∼ 0.53) and retrograde orbit. Since the extreme chemical anomaly of 2M16011638-1201525 has also been observed in halo field stars, this object could also be considered a halo contaminant, likely to have been ejected into the Milky Way disk from the halo. We conclude that 2M16011638-20152 is also kinematically consistent with the disk but chemically consistent with halo field stars.

Idioma originalEnglish
Número de artículo132
PublicaciónAstrophysical Journal
Volumen833
N.º2
DOI
EstadoPublished - 20 dic 2016
Publicado de forma externa

Huella dactilar

globular clusters
star distribution
halos
observatory
anomaly
stars
pollutant
metal
retrograde orbits
giant stars
experiment
light elements
eccentrics
galactic evolution
encounters
contaminants
observatories
anomalies
orbits
orbitals

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

Citar esto

Fernández-Trincado, J. G., Robin, A. C., Moreno, E., Schiavon, R. P., Pérez, A. E. G., Vieira, K., ... Allard, F. (2016). DISCOVERY of A METAL-POOR FIELD GIANT with A GLOBULAR CLUSTER SECOND-GENERATION ABUNDANCE PATTERN. Astrophysical Journal, 833(2), [132]. https://doi.org/10.3847/1538-4357/833/2/132
Fernández-Trincado, J. G. ; Robin, A. C. ; Moreno, E. ; Schiavon, R. P. ; Pérez, A. E.García ; Vieira, K. ; Cunha, K. ; Zamora, O. ; Sneden, C. ; Souto, Diogo ; Carrera, R. ; Johnson, J. A. ; Shetrone, M. ; Zasowski, G. ; García-Hernández, D. A. ; Majewski, S. R. ; Reylé, C. ; Blanco-Cuaresma, S. ; Martinez-Medina, L. A. ; Pérez-Villegas, A. ; Valenzuela, O. ; Pichardo, B. ; Meza, A. ; Mészáros, Sz ; Sobeck, J. ; Geisler, D. ; Anders, F. ; Schultheis, M. ; Tang, B. ; Roman-Lopes, A. ; Mennickent, R. E. ; Pan, K. ; Nitschelm, C. ; Allard, F. / DISCOVERY of A METAL-POOR FIELD GIANT with A GLOBULAR CLUSTER SECOND-GENERATION ABUNDANCE PATTERN. En: Astrophysical Journal. 2016 ; Vol. 833, N.º 2.
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abstract = "We report on the detection, from observations obtained with the Apache Point Observatory Galactic Evolution Experiment spectroscopic survey, of a metal-poor ([Fe/H] = -1.3 dex) field giant star with an extreme Mg-Al abundance ratio ([Mg/Fe] = -0.31 dex; [Al/Fe] = 1.49 dex). Such low Mg/Al ratios are seen only among the second-generation population of globular clusters (GCs) and are not present among Galactic disk field stars. The light-element abundances of this star, 2M16011638-1201525, suggest that it could have been born in a GC. We explore several origin scenarios, studying the orbit of the star in particular to check the probability of its being kinematically related to known GCs. We performed simple orbital integrations assuming the estimated distance of 2M16011638-1201525 and the available six-dimensional phase-space coordinates of 63 GCs, looking for close encounters in the past with a minimum distance approach within the tidal radius of each cluster. We found a very low probability that 2M16011638-1201525 was ejected from most GCs; however, we note that the best progenitor candidate to host this star is GC ω Centauri (NGC 5139). Our dynamical investigation demonstrates that 2M16011638-1201525 reaches a distance from the Galactic plane and minimum and maximum approaches to the Galactic center of R min < 0.62 kpc and R max < 7.26 kpc in an eccentric (e ∼ 0.53) and retrograde orbit. Since the extreme chemical anomaly of 2M16011638-1201525 has also been observed in halo field stars, this object could also be considered a halo contaminant, likely to have been ejected into the Milky Way disk from the halo. We conclude that 2M16011638-20152 is also kinematically consistent with the disk but chemically consistent with halo field stars.",
keywords = "globular clusters: general, stars: abundances, stars: Population II",
author = "Fern{\'a}ndez-Trincado, {J. G.} and Robin, {A. C.} and E. Moreno and Schiavon, {R. P.} and P{\'e}rez, {A. E.Garc{\'i}a} and K. Vieira and K. Cunha and O. Zamora and C. Sneden and Diogo Souto and R. Carrera and Johnson, {J. A.} and M. Shetrone and G. Zasowski and Garc{\'i}a-Hern{\'a}ndez, {D. A.} and Majewski, {S. R.} and C. Reyl{\'e} and S. Blanco-Cuaresma and Martinez-Medina, {L. A.} and A. P{\'e}rez-Villegas and O. Valenzuela and B. Pichardo and A. Meza and Sz M{\'e}sz{\'a}ros and J. Sobeck and D. Geisler and F. Anders and M. Schultheis and B. Tang and A. Roman-Lopes and Mennickent, {R. E.} and K. Pan and C. Nitschelm and F. Allard",
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Fernández-Trincado, JG, Robin, AC, Moreno, E, Schiavon, RP, Pérez, AEG, Vieira, K, Cunha, K, Zamora, O, Sneden, C, Souto, D, Carrera, R, Johnson, JA, Shetrone, M, Zasowski, G, García-Hernández, DA, Majewski, SR, Reylé, C, Blanco-Cuaresma, S, Martinez-Medina, LA, Pérez-Villegas, A, Valenzuela, O, Pichardo, B, Meza, A, Mészáros, S, Sobeck, J, Geisler, D, Anders, F, Schultheis, M, Tang, B, Roman-Lopes, A, Mennickent, RE, Pan, K, Nitschelm, C & Allard, F 2016, 'DISCOVERY of A METAL-POOR FIELD GIANT with A GLOBULAR CLUSTER SECOND-GENERATION ABUNDANCE PATTERN', Astrophysical Journal, vol. 833, n.º 2, 132. https://doi.org/10.3847/1538-4357/833/2/132

DISCOVERY of A METAL-POOR FIELD GIANT with A GLOBULAR CLUSTER SECOND-GENERATION ABUNDANCE PATTERN. / Fernández-Trincado, J. G.; Robin, A. C.; Moreno, E.; Schiavon, R. P.; Pérez, A. E.García; Vieira, K.; Cunha, K.; Zamora, O.; Sneden, C.; Souto, Diogo; Carrera, R.; Johnson, J. A.; Shetrone, M.; Zasowski, G.; García-Hernández, D. A.; Majewski, S. R.; Reylé, C.; Blanco-Cuaresma, S.; Martinez-Medina, L. A.; Pérez-Villegas, A.; Valenzuela, O.; Pichardo, B.; Meza, A.; Mészáros, Sz; Sobeck, J.; Geisler, D.; Anders, F.; Schultheis, M.; Tang, B.; Roman-Lopes, A.; Mennickent, R. E.; Pan, K.; Nitschelm, C.; Allard, F.

En: Astrophysical Journal, Vol. 833, N.º 2, 132, 20.12.2016.

Resultado de la investigación: Article

TY - JOUR

T1 - DISCOVERY of A METAL-POOR FIELD GIANT with A GLOBULAR CLUSTER SECOND-GENERATION ABUNDANCE PATTERN

AU - Fernández-Trincado, J. G.

AU - Robin, A. C.

AU - Moreno, E.

AU - Schiavon, R. P.

AU - Pérez, A. E.García

AU - Vieira, K.

AU - Cunha, K.

AU - Zamora, O.

AU - Sneden, C.

AU - Souto, Diogo

AU - Carrera, R.

AU - Johnson, J. A.

AU - Shetrone, M.

AU - Zasowski, G.

AU - García-Hernández, D. A.

AU - Majewski, S. R.

AU - Reylé, C.

AU - Blanco-Cuaresma, S.

AU - Martinez-Medina, L. A.

AU - Pérez-Villegas, A.

AU - Valenzuela, O.

AU - Pichardo, B.

AU - Meza, A.

AU - Mészáros, Sz

AU - Sobeck, J.

AU - Geisler, D.

AU - Anders, F.

AU - Schultheis, M.

AU - Tang, B.

AU - Roman-Lopes, A.

AU - Mennickent, R. E.

AU - Pan, K.

AU - Nitschelm, C.

AU - Allard, F.

PY - 2016/12/20

Y1 - 2016/12/20

N2 - We report on the detection, from observations obtained with the Apache Point Observatory Galactic Evolution Experiment spectroscopic survey, of a metal-poor ([Fe/H] = -1.3 dex) field giant star with an extreme Mg-Al abundance ratio ([Mg/Fe] = -0.31 dex; [Al/Fe] = 1.49 dex). Such low Mg/Al ratios are seen only among the second-generation population of globular clusters (GCs) and are not present among Galactic disk field stars. The light-element abundances of this star, 2M16011638-1201525, suggest that it could have been born in a GC. We explore several origin scenarios, studying the orbit of the star in particular to check the probability of its being kinematically related to known GCs. We performed simple orbital integrations assuming the estimated distance of 2M16011638-1201525 and the available six-dimensional phase-space coordinates of 63 GCs, looking for close encounters in the past with a minimum distance approach within the tidal radius of each cluster. We found a very low probability that 2M16011638-1201525 was ejected from most GCs; however, we note that the best progenitor candidate to host this star is GC ω Centauri (NGC 5139). Our dynamical investigation demonstrates that 2M16011638-1201525 reaches a distance from the Galactic plane and minimum and maximum approaches to the Galactic center of R min < 0.62 kpc and R max < 7.26 kpc in an eccentric (e ∼ 0.53) and retrograde orbit. Since the extreme chemical anomaly of 2M16011638-1201525 has also been observed in halo field stars, this object could also be considered a halo contaminant, likely to have been ejected into the Milky Way disk from the halo. We conclude that 2M16011638-20152 is also kinematically consistent with the disk but chemically consistent with halo field stars.

AB - We report on the detection, from observations obtained with the Apache Point Observatory Galactic Evolution Experiment spectroscopic survey, of a metal-poor ([Fe/H] = -1.3 dex) field giant star with an extreme Mg-Al abundance ratio ([Mg/Fe] = -0.31 dex; [Al/Fe] = 1.49 dex). Such low Mg/Al ratios are seen only among the second-generation population of globular clusters (GCs) and are not present among Galactic disk field stars. The light-element abundances of this star, 2M16011638-1201525, suggest that it could have been born in a GC. We explore several origin scenarios, studying the orbit of the star in particular to check the probability of its being kinematically related to known GCs. We performed simple orbital integrations assuming the estimated distance of 2M16011638-1201525 and the available six-dimensional phase-space coordinates of 63 GCs, looking for close encounters in the past with a minimum distance approach within the tidal radius of each cluster. We found a very low probability that 2M16011638-1201525 was ejected from most GCs; however, we note that the best progenitor candidate to host this star is GC ω Centauri (NGC 5139). Our dynamical investigation demonstrates that 2M16011638-1201525 reaches a distance from the Galactic plane and minimum and maximum approaches to the Galactic center of R min < 0.62 kpc and R max < 7.26 kpc in an eccentric (e ∼ 0.53) and retrograde orbit. Since the extreme chemical anomaly of 2M16011638-1201525 has also been observed in halo field stars, this object could also be considered a halo contaminant, likely to have been ejected into the Milky Way disk from the halo. We conclude that 2M16011638-20152 is also kinematically consistent with the disk but chemically consistent with halo field stars.

KW - globular clusters: general

KW - stars: abundances

KW - stars: Population II

UR - http://www.scopus.com/inward/record.url?scp=85008223136&partnerID=8YFLogxK

U2 - 10.3847/1538-4357/833/2/132

DO - 10.3847/1538-4357/833/2/132

M3 - Article

AN - SCOPUS:85008223136

VL - 833

JO - Astrophysical Journal

JF - Astrophysical Journal

SN - 0004-637X

IS - 2

M1 - 132

ER -

Fernández-Trincado JG, Robin AC, Moreno E, Schiavon RP, Pérez AEG, Vieira K y otros. DISCOVERY of A METAL-POOR FIELD GIANT with A GLOBULAR CLUSTER SECOND-GENERATION ABUNDANCE PATTERN. Astrophysical Journal. 2016 dic 20;833(2). 132. https://doi.org/10.3847/1538-4357/833/2/132