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Dynamically Tagged Groups of Very Metal-poor Halo Stars from the HK and Hamburg/ESO Surveys

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Dynamically Tagged Groups of Very Metal-poor Halo Stars from the HK and Hamburg/ESO Surveys. / Limberg, Guilherme; Rossi, Silvia; Beers, Timothy; Perottoni, Helio; Perez-Villegas, Angeles; Santucci, Rafael; Abuchaim, Yuri; Placco, Vinicius; Lee, Young Sun; Christlieb, Norbert; Norris, John; Bessell, Michael; Ryan, Sean; Wilhelm, Ronald; Rhee, Jaehyon; Frebel, Anna.

In: The Astrophysical Journal, Vol. 907, No. 1, 10, 20.01.2021.

Research output: Contribution to journalArticlepeer-review

Harvard

Limberg, G, Rossi, S, Beers, T, Perottoni, H, Perez-Villegas, A, Santucci, R, Abuchaim, Y, Placco, V, Lee, YS, Christlieb, N, Norris, J, Bessell, M, Ryan, S, Wilhelm, R, Rhee, J & Frebel, A 2021, 'Dynamically Tagged Groups of Very Metal-poor Halo Stars from the HK and Hamburg/ESO Surveys', The Astrophysical Journal, vol. 907, no. 1, 10. https://doi.org/10.3847/1538-4357/abcb87

APA

Limberg, G., Rossi, S., Beers, T., Perottoni, H., Perez-Villegas, A., Santucci, R., Abuchaim, Y., Placco, V., Lee, Y. S., Christlieb, N., Norris, J., Bessell, M., Ryan, S., Wilhelm, R., Rhee, J., & Frebel, A. (2021). Dynamically Tagged Groups of Very Metal-poor Halo Stars from the HK and Hamburg/ESO Surveys. The Astrophysical Journal, 907(1), [10]. https://doi.org/10.3847/1538-4357/abcb87

Vancouver

Limberg G, Rossi S, Beers T, Perottoni H, Perez-Villegas A, Santucci R et al. Dynamically Tagged Groups of Very Metal-poor Halo Stars from the HK and Hamburg/ESO Surveys. The Astrophysical Journal. 2021 Jan 20;907(1). 10. https://doi.org/10.3847/1538-4357/abcb87

Author

Limberg, Guilherme ; Rossi, Silvia ; Beers, Timothy ; Perottoni, Helio ; Perez-Villegas, Angeles ; Santucci, Rafael ; Abuchaim, Yuri ; Placco, Vinicius ; Lee, Young Sun ; Christlieb, Norbert ; Norris, John ; Bessell, Michael ; Ryan, Sean ; Wilhelm, Ronald ; Rhee, Jaehyon ; Frebel, Anna. / Dynamically Tagged Groups of Very Metal-poor Halo Stars from the HK and Hamburg/ESO Surveys. In: The Astrophysical Journal. 2021 ; Vol. 907, No. 1.

Bibtex

@article{087b1dbc1b45467aae0cc0fcd68ea4f6,
title = "Dynamically Tagged Groups of Very Metal-poor Halo Stars from the HK and Hamburg/ESO Surveys",
abstract = "We analyze the dynamical properties of ∼1500 very metal-poor (VMP; [Fe/H] ≲−2.0) halo stars, based primarily on medium-resolution spectroscopic data from the HK and Hamburg/ESO surveys. These data, collected over the past thirty years, are supplemented by a number of calibration stars and other small samples, along with astrometric information from Gaia DR2. We apply a clustering algorithm to the 4-D energy-action space of the sample, and identify a set of 38 Dynamically Tagged Groups (DTGs), containing between 5 and 30 member stars. Many of these DTGs can be associated with previously known prominent substructures such as Gaia-Sausage/Enceladus (GSE), Sequoia, the Helmi Stream (HStr), and Thamnos. Others are associated with previously identified smaller dynamical groups of stars and streams. We identify 10 new DTGs as well, many of which have strongly retrograde orbits. We also investigate possible connections between our DTGs and ∼300 individual r-process-enhanced (RPE) stars \textbf{from a recent literature compilation}. We find that several of these objects have similar dynamical properties to GSE (5), the HStr (4), Sequoia (1), and Rg5 (1), indicating that their progenitors might have been important sources of RPE stars in the Galaxy. Additionally, a number of our newly identified DTGs are shown to be associated with at least two RPE stars each (DTG-2: 3, DTG-7: 2; DTG-27: 2). Taken as a whole, these results are consistent with ultra-faint and/or dwarf spheroidal galaxies as birth environments in which r-process nucleosynthesis took place, and then were disrupted by the Milky Way.",
keywords = "Galaxy: stellar halo, Galaxy: formation, Galaxy: kinematics and dynamics, Stars: very metal-poor, Chemical Evolution: r-process, Stellar Populations: Population II",
author = "Guilherme Limberg and Silvia Rossi and Timothy Beers and Helio Perottoni and Angeles Perez-Villegas and Rafael Santucci and Yuri Abuchaim and Vinicius Placco and Lee, {Young Sun} and Norbert Christlieb and John Norris and Michael Bessell and Sean Ryan and Ronald Wilhelm and Jaehyon Rhee and Anna Frebel",
note = "{\textcopyright} 2020. The American Astronomical Society. All rights reserved.",
year = "2021",
month = jan,
day = "20",
doi = "10.3847/1538-4357/abcb87",
language = "English",
volume = "907",
journal = "The Astrophysical Journal",
issn = "0004-637X",
publisher = "IOP Publishing Ltd.",
number = "1",

}

RIS

TY - JOUR

T1 - Dynamically Tagged Groups of Very Metal-poor Halo Stars from the HK and Hamburg/ESO Surveys

AU - Limberg, Guilherme

AU - Rossi, Silvia

AU - Beers, Timothy

AU - Perottoni, Helio

AU - Perez-Villegas, Angeles

AU - Santucci, Rafael

AU - Abuchaim, Yuri

AU - Placco, Vinicius

AU - Lee, Young Sun

AU - Christlieb, Norbert

AU - Norris, John

AU - Bessell, Michael

AU - Ryan, Sean

AU - Wilhelm, Ronald

AU - Rhee, Jaehyon

AU - Frebel, Anna

N1 - © 2020. The American Astronomical Society. All rights reserved.

PY - 2021/1/20

Y1 - 2021/1/20

N2 - We analyze the dynamical properties of ∼1500 very metal-poor (VMP; [Fe/H] ≲−2.0) halo stars, based primarily on medium-resolution spectroscopic data from the HK and Hamburg/ESO surveys. These data, collected over the past thirty years, are supplemented by a number of calibration stars and other small samples, along with astrometric information from Gaia DR2. We apply a clustering algorithm to the 4-D energy-action space of the sample, and identify a set of 38 Dynamically Tagged Groups (DTGs), containing between 5 and 30 member stars. Many of these DTGs can be associated with previously known prominent substructures such as Gaia-Sausage/Enceladus (GSE), Sequoia, the Helmi Stream (HStr), and Thamnos. Others are associated with previously identified smaller dynamical groups of stars and streams. We identify 10 new DTGs as well, many of which have strongly retrograde orbits. We also investigate possible connections between our DTGs and ∼300 individual r-process-enhanced (RPE) stars \textbf{from a recent literature compilation}. We find that several of these objects have similar dynamical properties to GSE (5), the HStr (4), Sequoia (1), and Rg5 (1), indicating that their progenitors might have been important sources of RPE stars in the Galaxy. Additionally, a number of our newly identified DTGs are shown to be associated with at least two RPE stars each (DTG-2: 3, DTG-7: 2; DTG-27: 2). Taken as a whole, these results are consistent with ultra-faint and/or dwarf spheroidal galaxies as birth environments in which r-process nucleosynthesis took place, and then were disrupted by the Milky Way.

AB - We analyze the dynamical properties of ∼1500 very metal-poor (VMP; [Fe/H] ≲−2.0) halo stars, based primarily on medium-resolution spectroscopic data from the HK and Hamburg/ESO surveys. These data, collected over the past thirty years, are supplemented by a number of calibration stars and other small samples, along with astrometric information from Gaia DR2. We apply a clustering algorithm to the 4-D energy-action space of the sample, and identify a set of 38 Dynamically Tagged Groups (DTGs), containing between 5 and 30 member stars. Many of these DTGs can be associated with previously known prominent substructures such as Gaia-Sausage/Enceladus (GSE), Sequoia, the Helmi Stream (HStr), and Thamnos. Others are associated with previously identified smaller dynamical groups of stars and streams. We identify 10 new DTGs as well, many of which have strongly retrograde orbits. We also investigate possible connections between our DTGs and ∼300 individual r-process-enhanced (RPE) stars \textbf{from a recent literature compilation}. We find that several of these objects have similar dynamical properties to GSE (5), the HStr (4), Sequoia (1), and Rg5 (1), indicating that their progenitors might have been important sources of RPE stars in the Galaxy. Additionally, a number of our newly identified DTGs are shown to be associated with at least two RPE stars each (DTG-2: 3, DTG-7: 2; DTG-27: 2). Taken as a whole, these results are consistent with ultra-faint and/or dwarf spheroidal galaxies as birth environments in which r-process nucleosynthesis took place, and then were disrupted by the Milky Way.

KW - Galaxy: stellar halo

KW - Galaxy: formation

KW - Galaxy: kinematics and dynamics

KW - Stars: very metal-poor

KW - Chemical Evolution: r-process

KW - Stellar Populations: Population II

U2 - 10.3847/1538-4357/abcb87

DO - 10.3847/1538-4357/abcb87

M3 - Article

VL - 907

JO - The Astrophysical Journal

JF - The Astrophysical Journal

SN - 0004-637X

IS - 1

M1 - 10

ER -