An r-process Enhanced Star in the Dwarf Galaxy Tucana III

T. T. Hansen; J. D. Simon; J. L. Marshall; T. S. Li; D. Carollo; D. L. Depoy; D. Q. Nagasawa; R. A. Bernstein; A. Drlica-Wagner; F. B. Abdalla; S. Allam; J. Annis; K. Bechtol; A. Benoit-Lévy; D. Brooks; E. Buckley-Geer; A. Carnero Rosell; M. Carrasco Kind; J. Carretero; C. E. Cunha; L. N.Da Costa; S. Desai; T. F. Eifler; A. Fausti Neto; B. Flaugher; J. Frieman; J. García-Bellido; E. Gaztanaga; D. W. Gerdes; D. Gruen; R. A. Gruendl; J. Gschwend; G. Gutierrez; D. J. James; E. Krause; K. Kuehn; N. Kuropatkin; O. Lahav; R. Miquel; A. A. Plazas; A. K. Romer; E. Sanchez; B. Santiago; V. Scarpine; R. C. Smith; M. Soares-Santos; F. Sobreira; E. Suchyta; M. E.C. Swanson; G. Tarle; A. R. Walker

doi:10.3847/1538-4357/aa634a

An r-process Enhanced Star in the Dwarf Galaxy Tucana III

T. T. Hansen, J. D. Simon, J. L. Marshall, T. S. Li, D. Carollo, D. L. Depoy, D. Q. Nagasawa, R. A. Bernstein, A. Drlica-Wagner, F. B. Abdalla, S. Allam, J. Annis, K. Bechtol, A. Benoit-Lévy, D. Brooks, E. Buckley-Geer, A. Carnero Rosell, M. Carrasco Kind, J. Carretero, C. E. CunhaL. N.Da Costa, S. Desai, T. F. Eifler, A. Fausti Neto, B. Flaugher, J. Frieman, J. García-Bellido, E. Gaztanaga, D. W. Gerdes, D. Gruen, R. A. Gruendl, J. Gschwend, G. Gutierrez, D. J. James, E. Krause, K. Kuehn, N. Kuropatkin, O. Lahav, R. Miquel, A. A. Plazas, A. K. Romer, E. Sanchez, B. Santiago, V. Scarpine, R. C. Smith, M. Soares-Santos, F. Sobreira, E. Suchyta, M. E.C. Swanson, G. Tarle, A. R. Walker

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Abstract

Chemically peculiar stars in dwarf galaxies provide a window for exploring the birth environment of stars with varying chemical enrichment. We present a chemical abundance analysis of the brightest star in the newly discovered ultra-faint dwarf galaxy candidate Tucana III. Because it is particularly bright for a star in an ultra-faint Milky Way (MW) satellite, we are able to measure the abundance of 28 elements, including 13 neutron-capture species. This star, DES J235532.66-593114.9 (DES J235532), shows a mild enhancement in neutron-capture elements associated with the r-process and can be classified as an r-I star. DES J235532 is the first r-I star to be discovered in an ultra-faint satellite, and Tuc III is the second extremely low-luminosity system found to contain r-process enriched material, after Reticulum II. Comparison of the abundance pattern of DES J235532 with r-I and r-II stars found in other dwarf galaxies and in the MW halo suggests a common astrophysical origin for the neutron-capture elements seen in all r-process enhanced stars. We explore both internal and external scenarios for the r-process enrichment of Tuc III and show that with abundance patterns for additional stars, it should be possible to distinguish between them.

Original language	English
Article number	44
Journal	Astrophysical Journal
Volume	838
Issue number	1
DOIs	https://doi.org/10.3847/1538-4357/aa634a
State	Published - Mar 20 2017

Bibliographical note

Publisher Copyright:
© 2017. The American Astronomical Society. All rights reserved..

Funding

Funders	Funder number
National Science Foundation	1138766, 240672, 306478, 235532, 291329, 1108811

Keywords

galaxies: abundances
galaxies: dwarf
stars: abundances
stars: chemically peculiar

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10.3847/1538-4357/aa634a

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Hansen, T. T., Simon, J. D., Marshall, J. L., Li, T. S., Carollo, D., Depoy, D. L., Nagasawa, D. Q., Bernstein, R. A., Drlica-Wagner, A., Abdalla, F. B., Allam, S., Annis, J., Bechtol, K., Benoit-Lévy, A., Brooks, D., Buckley-Geer, E., Rosell, A. C., Kind, M. C., Carretero, J., ... Walker, A. R. (2017). An r-process Enhanced Star in the Dwarf Galaxy Tucana III. Astrophysical Journal, 838(1), Article 44. https://doi.org/10.3847/1538-4357/aa634a

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title = "An r-process Enhanced Star in the Dwarf Galaxy Tucana III",

abstract = "Chemically peculiar stars in dwarf galaxies provide a window for exploring the birth environment of stars with varying chemical enrichment. We present a chemical abundance analysis of the brightest star in the newly discovered ultra-faint dwarf galaxy candidate Tucana III. Because it is particularly bright for a star in an ultra-faint Milky Way (MW) satellite, we are able to measure the abundance of 28 elements, including 13 neutron-capture species. This star, DES J235532.66-593114.9 (DES J235532), shows a mild enhancement in neutron-capture elements associated with the r-process and can be classified as an r-I star. DES J235532 is the first r-I star to be discovered in an ultra-faint satellite, and Tuc III is the second extremely low-luminosity system found to contain r-process enriched material, after Reticulum II. Comparison of the abundance pattern of DES J235532 with r-I and r-II stars found in other dwarf galaxies and in the MW halo suggests a common astrophysical origin for the neutron-capture elements seen in all r-process enhanced stars. We explore both internal and external scenarios for the r-process enrichment of Tuc III and show that with abundance patterns for additional stars, it should be possible to distinguish between them.",

keywords = "galaxies: abundances, galaxies: dwarf, stars: abundances, stars: chemically peculiar",

author = "Hansen, {T. T.} and Simon, {J. D.} and Marshall, {J. L.} and Li, {T. S.} and D. Carollo and Depoy, {D. L.} and Nagasawa, {D. Q.} and Bernstein, {R. A.} and A. Drlica-Wagner and Abdalla, {F. B.} and S. Allam and J. Annis and K. Bechtol and A. Benoit-L{\'e}vy and D. Brooks and E. Buckley-Geer and Rosell, {A. Carnero} and Kind, {M. Carrasco} and J. Carretero and Cunha, {C. E.} and Costa, {L. N.Da} and S. Desai and Eifler, {T. F.} and Neto, {A. Fausti} and B. Flaugher and J. Frieman and J. Garc{\'i}a-Bellido and E. Gaztanaga and Gerdes, {D. W.} and D. Gruen and Gruendl, {R. A.} and J. Gschwend and G. Gutierrez and James, {D. J.} and E. Krause and K. Kuehn and N. Kuropatkin and O. Lahav and R. Miquel and Plazas, {A. A.} and Romer, {A. K.} and E. Sanchez and B. Santiago and V. Scarpine and Smith, {R. C.} and M. Soares-Santos and F. Sobreira and E. Suchyta and Swanson, {M. E.C.} and G. Tarle and Walker, {A. R.}",

year = "2017",

month = mar,

day = "20",

doi = "10.3847/1538-4357/aa634a",

language = "English",

volume = "838",

journal = "Astrophysical Journal",

issn = "0004-637X",

publisher = "American Astronomical Society",

number = "1",

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Hansen, TT, Simon, JD, Marshall, JL, Li, TS, Carollo, D, Depoy, DL, Nagasawa, DQ, Bernstein, RA, Drlica-Wagner, A, Abdalla, FB, Allam, S, Annis, J, Bechtol, K, Benoit-Lévy, A, Brooks, D, Buckley-Geer, E, Rosell, AC, Kind, MC, Carretero, J, Cunha, CE, Costa, LND, Desai, S, Eifler, TF, Neto, AF, Flaugher, B, Frieman, J, García-Bellido, J, Gaztanaga, E, Gerdes, DW, Gruen, D, Gruendl, RA, Gschwend, J, Gutierrez, G, James, DJ, Krause, E, Kuehn, K, Kuropatkin, N, Lahav, O, Miquel, R, Plazas, AA, Romer, AK, Sanchez, E, Santiago, B, Scarpine, V, Smith, RC, Soares-Santos, M, Sobreira, F, Suchyta, E, Swanson, MEC, Tarle, G & Walker, AR 2017, 'An r-process Enhanced Star in the Dwarf Galaxy Tucana III', Astrophysical Journal, vol. 838, no. 1, 44. https://doi.org/10.3847/1538-4357/aa634a

TY - JOUR

T1 - An r-process Enhanced Star in the Dwarf Galaxy Tucana III

AU - Hansen, T. T.

AU - Simon, J. D.

AU - Marshall, J. L.

AU - Li, T. S.

AU - Carollo, D.

AU - Depoy, D. L.

AU - Nagasawa, D. Q.

AU - Bernstein, R. A.

AU - Drlica-Wagner, A.

AU - Abdalla, F. B.

AU - Allam, S.

AU - Annis, J.

AU - Bechtol, K.

AU - Benoit-Lévy, A.

AU - Brooks, D.

AU - Buckley-Geer, E.

AU - Rosell, A. Carnero

AU - Kind, M. Carrasco

AU - Carretero, J.

AU - Cunha, C. E.

AU - Costa, L. N.Da

AU - Desai, S.

AU - Eifler, T. F.

AU - Neto, A. Fausti

AU - Flaugher, B.

AU - Frieman, J.

AU - García-Bellido, J.

AU - Gaztanaga, E.

AU - Gerdes, D. W.

AU - Gruen, D.

AU - Gruendl, R. A.

AU - Gschwend, J.

AU - Gutierrez, G.

AU - James, D. J.

AU - Krause, E.

AU - Kuehn, K.

AU - Kuropatkin, N.

AU - Lahav, O.

AU - Miquel, R.

AU - Plazas, A. A.

AU - Romer, A. K.

AU - Sanchez, E.

AU - Santiago, B.

AU - Scarpine, V.

AU - Smith, R. C.

AU - Soares-Santos, M.

AU - Sobreira, F.

AU - Suchyta, E.

AU - Swanson, M. E.C.

AU - Tarle, G.

AU - Walker, A. R.

PY - 2017/3/20

Y1 - 2017/3/20

N2 - Chemically peculiar stars in dwarf galaxies provide a window for exploring the birth environment of stars with varying chemical enrichment. We present a chemical abundance analysis of the brightest star in the newly discovered ultra-faint dwarf galaxy candidate Tucana III. Because it is particularly bright for a star in an ultra-faint Milky Way (MW) satellite, we are able to measure the abundance of 28 elements, including 13 neutron-capture species. This star, DES J235532.66-593114.9 (DES J235532), shows a mild enhancement in neutron-capture elements associated with the r-process and can be classified as an r-I star. DES J235532 is the first r-I star to be discovered in an ultra-faint satellite, and Tuc III is the second extremely low-luminosity system found to contain r-process enriched material, after Reticulum II. Comparison of the abundance pattern of DES J235532 with r-I and r-II stars found in other dwarf galaxies and in the MW halo suggests a common astrophysical origin for the neutron-capture elements seen in all r-process enhanced stars. We explore both internal and external scenarios for the r-process enrichment of Tuc III and show that with abundance patterns for additional stars, it should be possible to distinguish between them.

AB - Chemically peculiar stars in dwarf galaxies provide a window for exploring the birth environment of stars with varying chemical enrichment. We present a chemical abundance analysis of the brightest star in the newly discovered ultra-faint dwarf galaxy candidate Tucana III. Because it is particularly bright for a star in an ultra-faint Milky Way (MW) satellite, we are able to measure the abundance of 28 elements, including 13 neutron-capture species. This star, DES J235532.66-593114.9 (DES J235532), shows a mild enhancement in neutron-capture elements associated with the r-process and can be classified as an r-I star. DES J235532 is the first r-I star to be discovered in an ultra-faint satellite, and Tuc III is the second extremely low-luminosity system found to contain r-process enriched material, after Reticulum II. Comparison of the abundance pattern of DES J235532 with r-I and r-II stars found in other dwarf galaxies and in the MW halo suggests a common astrophysical origin for the neutron-capture elements seen in all r-process enhanced stars. We explore both internal and external scenarios for the r-process enrichment of Tuc III and show that with abundance patterns for additional stars, it should be possible to distinguish between them.

KW - galaxies: abundances

KW - galaxies: dwarf

KW - stars: abundances

KW - stars: chemically peculiar

UR - http://www.scopus.com/inward/record.url?scp=85016772697&partnerID=8YFLogxK

U2 - 10.3847/1538-4357/aa634a

DO - 10.3847/1538-4357/aa634a

M3 - Article

AN - SCOPUS:85016772697

SN - 0004-637X

VL - 838

JO - Astrophysical Journal

JF - Astrophysical Journal

IS - 1

M1 - 44

ER -

An r-process Enhanced Star in the Dwarf Galaxy Tucana III

Abstract

Bibliographical note

Funding

Keywords

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