The Southern Stellar Stream Spectroscopic Survey (S5): Chemical Abundances of Seven Stellar Streams

Alexander P. Ji; Ting S. Li; Terese T. Hansen; Andrew R. Casey; Sergey E. Koposov; Andrew B. Pace; Dougal Mackey; Geraint F. Lewis; Jeffrey D. Simpson; Joss Bland-Hawthorn; Lara R. Cullinane; Gary S. Da Costa; Kohei Hattori; Sarah L. Martell; Kyler Kuehn; Denis Erkal; Nora Shipp; Zhen Wan; Daniel B. Zucker

doi:10.3847/1538-3881/abacb6

The Southern Stellar Stream Spectroscopic Survey (S5): Chemical Abundances of Seven Stellar Streams

Alexander P. Ji, Ting S. Li, Terese T. Hansen, Andrew R. Casey, Sergey E. Koposov, Andrew B. Pace, Dougal Mackey, Geraint F. Lewis, Jeffrey D. Simpson, Joss Bland-Hawthorn, Lara R. Cullinane, Gary S. Da Costa, Kohei Hattori, Sarah L. Martell, Kyler Kuehn, Denis Erkal, Nora Shipp, Zhen Wan, Daniel B. Zucker

School of Physics and Astronomy

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Abstract / Description of output

We present high-resolution Magellan/MIKE spectroscopy of 42 red giant stars in seven stellar streams confirmed by the Southern Stellar Stream Spectroscopic Survey (S5): ATLAS, Aliqa Uma, Chenab, Elqui, Indus, Jhelum, and Phoenix. Abundances of 30 elements have been derived from over 10,000 individual line measurements or upper limits using photometric stellar parameters and a standard LTE analysis. This is currently the most extensive set of element abundances for stars in stellar streams. Three streams (ATLAS, Aliqa Uma, and Phoenix) are disrupted metal-poor globular clusters, although only weak evidence is seen for the light element anticorrelations commonly observed in globular clusters. Four streams (Chenab, Elqui, Indus, and Jhelum) are disrupted dwarf galaxies, and their stars display abundance signatures that suggest progenitors with stellar masses ranging from $10^6-10^7 M_\odot$. Extensive description is provided for the analysis methods, including the derivation of a new method for including the effect of stellar parameter correlations on each star's abundance and uncertainty. This paper includes data gathered with the 6.5 meter Magellan Telescopes located at Las Campanas Observatory, Chile.

Original language	English
Article number	181
Number of pages	39
Journal	Astrophysical Journal
Volume	160
Issue number	4
Early online date	24 Sept 2020
DOIs	https://doi.org/10.3847/1538-3881/abacb6
Publication status	Published - 1 Oct 2020

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astro-ph.SR
astro-ph.GA

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10.3847/1538-3881/abacb6

2008.07568Accepted author manuscript, 2.71 MB

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Ji, A. P., Li, T. S., Hansen, T. T., Casey, A. R., Koposov, S. E., Pace, A. B., Mackey, D., Lewis, G. F., Simpson, J. D., Bland-Hawthorn, J., Cullinane, L. R., Costa, G. S. D., Hattori, K., Martell, S. L., Kuehn, K., Erkal, D., Shipp, N., Wan, Z., & Zucker, D. B. (2020). The Southern Stellar Stream Spectroscopic Survey (S5): Chemical Abundances of Seven Stellar Streams. Astrophysical Journal, 160(4), Article 181. https://doi.org/10.3847/1538-3881/abacb6

@article{24a89a88ece34aeaa8e641cb67e5d559,

title = "The Southern Stellar Stream Spectroscopic Survey (S5): Chemical Abundances of Seven Stellar Streams",

abstract = " We present high-resolution Magellan/MIKE spectroscopy of 42 red giant stars in seven stellar streams confirmed by the Southern Stellar Stream Spectroscopic Survey (S5): ATLAS, Aliqa Uma, Chenab, Elqui, Indus, Jhelum, and Phoenix. Abundances of 30 elements have been derived from over 10,000 individual line measurements or upper limits using photometric stellar parameters and a standard LTE analysis. This is currently the most extensive set of element abundances for stars in stellar streams. Three streams (ATLAS, Aliqa Uma, and Phoenix) are disrupted metal-poor globular clusters, although only weak evidence is seen for the light element anticorrelations commonly observed in globular clusters. Four streams (Chenab, Elqui, Indus, and Jhelum) are disrupted dwarf galaxies, and their stars display abundance signatures that suggest progenitors with stellar masses ranging from $10^6-10^7 M_\odot$. Extensive description is provided for the analysis methods, including the derivation of a new method for including the effect of stellar parameter correlations on each star's abundance and uncertainty. This paper includes data gathered with the 6.5 meter Magellan Telescopes located at Las Campanas Observatory, Chile. ",

keywords = "astro-ph.SR, astro-ph.GA",

author = "Ji, {Alexander P.} and Li, {Ting S.} and Hansen, {Terese T.} and Casey, {Andrew R.} and Koposov, {Sergey E.} and Pace, {Andrew B.} and Dougal Mackey and Lewis, {Geraint F.} and Simpson, {Jeffrey D.} and Joss Bland-Hawthorn and Cullinane, {Lara R.} and Costa, {Gary S. Da} and Kohei Hattori and Martell, {Sarah L.} and Kyler Kuehn and Denis Erkal and Nora Shipp and Zhen Wan and Zucker, {Daniel B.}",

note = "Accepted to AJ. 39 pages, 13 figures, 7 tables",

year = "2020",

month = oct,

day = "1",

doi = "10.3847/1538-3881/abacb6",

language = "English",

volume = "160",

journal = "Astrophysical Journal",

issn = "0004-637X",

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Ji, AP, Li, TS, Hansen, TT, Casey, AR, Koposov, SE, Pace, AB, Mackey, D, Lewis, GF, Simpson, JD, Bland-Hawthorn, J, Cullinane, LR, Costa, GSD, Hattori, K, Martell, SL, Kuehn, K, Erkal, D, Shipp, N, Wan, Z & Zucker, DB 2020, 'The Southern Stellar Stream Spectroscopic Survey (S5): Chemical Abundances of Seven Stellar Streams', Astrophysical Journal, vol. 160, no. 4, 181. https://doi.org/10.3847/1538-3881/abacb6

TY - JOUR

T1 - The Southern Stellar Stream Spectroscopic Survey (S5)

T2 - Chemical Abundances of Seven Stellar Streams

AU - Ji, Alexander P.

AU - Li, Ting S.

AU - Hansen, Terese T.

AU - Casey, Andrew R.

AU - Koposov, Sergey E.

AU - Pace, Andrew B.

AU - Mackey, Dougal

AU - Lewis, Geraint F.

AU - Simpson, Jeffrey D.

AU - Bland-Hawthorn, Joss

AU - Cullinane, Lara R.

AU - Costa, Gary S. Da

AU - Hattori, Kohei

AU - Martell, Sarah L.

AU - Kuehn, Kyler

AU - Erkal, Denis

AU - Shipp, Nora

AU - Wan, Zhen

AU - Zucker, Daniel B.

N1 - Accepted to AJ. 39 pages, 13 figures, 7 tables

PY - 2020/10/1

Y1 - 2020/10/1

N2 - We present high-resolution Magellan/MIKE spectroscopy of 42 red giant stars in seven stellar streams confirmed by the Southern Stellar Stream Spectroscopic Survey (S5): ATLAS, Aliqa Uma, Chenab, Elqui, Indus, Jhelum, and Phoenix. Abundances of 30 elements have been derived from over 10,000 individual line measurements or upper limits using photometric stellar parameters and a standard LTE analysis. This is currently the most extensive set of element abundances for stars in stellar streams. Three streams (ATLAS, Aliqa Uma, and Phoenix) are disrupted metal-poor globular clusters, although only weak evidence is seen for the light element anticorrelations commonly observed in globular clusters. Four streams (Chenab, Elqui, Indus, and Jhelum) are disrupted dwarf galaxies, and their stars display abundance signatures that suggest progenitors with stellar masses ranging from $10^6-10^7 M_\odot$. Extensive description is provided for the analysis methods, including the derivation of a new method for including the effect of stellar parameter correlations on each star's abundance and uncertainty. This paper includes data gathered with the 6.5 meter Magellan Telescopes located at Las Campanas Observatory, Chile.

AB - We present high-resolution Magellan/MIKE spectroscopy of 42 red giant stars in seven stellar streams confirmed by the Southern Stellar Stream Spectroscopic Survey (S5): ATLAS, Aliqa Uma, Chenab, Elqui, Indus, Jhelum, and Phoenix. Abundances of 30 elements have been derived from over 10,000 individual line measurements or upper limits using photometric stellar parameters and a standard LTE analysis. This is currently the most extensive set of element abundances for stars in stellar streams. Three streams (ATLAS, Aliqa Uma, and Phoenix) are disrupted metal-poor globular clusters, although only weak evidence is seen for the light element anticorrelations commonly observed in globular clusters. Four streams (Chenab, Elqui, Indus, and Jhelum) are disrupted dwarf galaxies, and their stars display abundance signatures that suggest progenitors with stellar masses ranging from $10^6-10^7 M_\odot$. Extensive description is provided for the analysis methods, including the derivation of a new method for including the effect of stellar parameter correlations on each star's abundance and uncertainty. This paper includes data gathered with the 6.5 meter Magellan Telescopes located at Las Campanas Observatory, Chile.

KW - astro-ph.SR

KW - astro-ph.GA

U2 - 10.3847/1538-3881/abacb6

DO - 10.3847/1538-3881/abacb6

M3 - Article

SN - 0004-637X

VL - 160

JO - Astrophysical Journal

JF - Astrophysical Journal

IS - 4

M1 - 181

ER -

The Southern Stellar Stream Spectroscopic Survey (S5): Chemical Abundances of Seven Stellar Streams

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