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Chemical abundance analysis of three α-poor, metal-poor stars in the ultrafaint dwarf galaxy Horologium I

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Chemical abundance analysis of three α-poor, metal-poor stars in the ultrafaint dwarf galaxy Horologium I. / Nagasawa, D. Q.; Marshall, J. L.; Simon, J. D.; Hansen, T. T.; Li, T. S.; Bernstein, R. A.; Balbinot, E.; Drlica-Wagner, A.; Pace, A. B.; Strigari, L. E.; Pellegrino, C. M.; DePoy, D. L.; Suntzeff, N. B.; Bechtol, K.; Abbott, T. M. C.; Abdalla, F. B.; Allam, S.; Annis, J.; Benoit-Lévy, A.; Bertin, E.; Brooks, D.; Rosell, A. Carnero; Kind, M. Carrasco; Carretero, J.; Cunha, C. E.; D'Andrea, C. B.; Costa, L. N. da; Davis, C.; Desai, S.; Doel, P.; Eifler, T. F.; Flaugher, B.; Fosalba, P.; Frieman, J.; García-Bellido, J.; Gaztanaga, E.; Gerdes, D. W.; Gruen, D.; Gruendl, R. A.; Gschwend, J.; Gutierrez, G.; Hartley, W. G.; Honscheid, K.; James, D. J.; Jeltema, T.; Krause, E.; Kuehn, K.; Kuhlmann, S.; Kuropatkin, N.; March, M.; Miquel, R.; Nord, B.; Roodman, A.; Sanchez, E.; Santiago, B.; Scarpine, V.; Schindler, R.; Schubnell, M.; Sevilla-Noarbe, I.; Smith, M.; Smith, R. C.; Soares-Santos, M.; Sobreira, F.; Suchyta, E.; Tarle, G.; Thomas, D.; Tucker, D. L.; Walker, A. R.; Wechsler, R. H.; Wolf, R. C.; Yanny, B.

In: The Astrophysical Journal, Vol. 852, No. 2, 99, 11.01.2018.

Research output: Contribution to journalArticlepeer-review

Harvard

Nagasawa, DQ, Marshall, JL, Simon, JD, Hansen, TT, Li, TS, Bernstein, RA, Balbinot, E, Drlica-Wagner, A, Pace, AB, Strigari, LE, Pellegrino, CM, DePoy, DL, Suntzeff, NB, Bechtol, K, Abbott, TMC, Abdalla, FB, Allam, S, Annis, J, Benoit-Lévy, A, Bertin, E, Brooks, D, Rosell, AC, Kind, MC, Carretero, J, Cunha, CE, D'Andrea, CB, Costa, LND, Davis, C, Desai, S, Doel, P, Eifler, TF, Flaugher, B, Fosalba, P, Frieman, J, García-Bellido, J, Gaztanaga, E, Gerdes, DW, Gruen, D, Gruendl, RA, Gschwend, J, Gutierrez, G, Hartley, WG, Honscheid, K, James, DJ, Jeltema, T, Krause, E, Kuehn, K, Kuhlmann, S, Kuropatkin, N, March, M, Miquel, R, Nord, B, Roodman, A, Sanchez, E, Santiago, B, Scarpine, V, Schindler, R, Schubnell, M, Sevilla-Noarbe, I, Smith, M, Smith, RC, Soares-Santos, M, Sobreira, F, Suchyta, E, Tarle, G, Thomas, D, Tucker, DL, Walker, AR, Wechsler, RH, Wolf, RC & Yanny, B 2018, 'Chemical abundance analysis of three α-poor, metal-poor stars in the ultrafaint dwarf galaxy Horologium I', The Astrophysical Journal, vol. 852, no. 2, 99. https://doi.org/10.3847/1538-4357/aaa01d

APA

Nagasawa, D. Q., Marshall, J. L., Simon, J. D., Hansen, T. T., Li, T. S., Bernstein, R. A., Balbinot, E., Drlica-Wagner, A., Pace, A. B., Strigari, L. E., Pellegrino, C. M., DePoy, D. L., Suntzeff, N. B., Bechtol, K., Abbott, T. M. C., Abdalla, F. B., Allam, S., Annis, J., Benoit-Lévy, A., ... Yanny, B. (2018). Chemical abundance analysis of three α-poor, metal-poor stars in the ultrafaint dwarf galaxy Horologium I. The Astrophysical Journal, 852(2), [99]. https://doi.org/10.3847/1538-4357/aaa01d

Vancouver

Nagasawa DQ, Marshall JL, Simon JD, Hansen TT, Li TS, Bernstein RA et al. Chemical abundance analysis of three α-poor, metal-poor stars in the ultrafaint dwarf galaxy Horologium I. The Astrophysical Journal. 2018 Jan 11;852(2). 99. https://doi.org/10.3847/1538-4357/aaa01d

Author

Nagasawa, D. Q. ; Marshall, J. L. ; Simon, J. D. ; Hansen, T. T. ; Li, T. S. ; Bernstein, R. A. ; Balbinot, E. ; Drlica-Wagner, A. ; Pace, A. B. ; Strigari, L. E. ; Pellegrino, C. M. ; DePoy, D. L. ; Suntzeff, N. B. ; Bechtol, K. ; Abbott, T. M. C. ; Abdalla, F. B. ; Allam, S. ; Annis, J. ; Benoit-Lévy, A. ; Bertin, E. ; Brooks, D. ; Rosell, A. Carnero ; Kind, M. Carrasco ; Carretero, J. ; Cunha, C. E. ; D'Andrea, C. B. ; Costa, L. N. da ; Davis, C. ; Desai, S. ; Doel, P. ; Eifler, T. F. ; Flaugher, B. ; Fosalba, P. ; Frieman, J. ; García-Bellido, J. ; Gaztanaga, E. ; Gerdes, D. W. ; Gruen, D. ; Gruendl, R. A. ; Gschwend, J. ; Gutierrez, G. ; Hartley, W. G. ; Honscheid, K. ; James, D. J. ; Jeltema, T. ; Krause, E. ; Kuehn, K. ; Kuhlmann, S. ; Kuropatkin, N. ; March, M. ; Miquel, R. ; Nord, B. ; Roodman, A. ; Sanchez, E. ; Santiago, B. ; Scarpine, V. ; Schindler, R. ; Schubnell, M. ; Sevilla-Noarbe, I. ; Smith, M. ; Smith, R. C. ; Soares-Santos, M. ; Sobreira, F. ; Suchyta, E. ; Tarle, G. ; Thomas, D. ; Tucker, D. L. ; Walker, A. R. ; Wechsler, R. H. ; Wolf, R. C. ; Yanny, B. / Chemical abundance analysis of three α-poor, metal-poor stars in the ultrafaint dwarf galaxy Horologium I. In: The Astrophysical Journal. 2018 ; Vol. 852, No. 2.

Bibtex

@article{35209bc1a8b043199f412b45234a6748,
title = "Chemical abundance analysis of three α-poor, metal-poor stars in the ultrafaint dwarf galaxy Horologium I",
abstract = "We present chemical abundance measurements of three stars in the ultrafaint dwarf galaxy Horologium I, a Milky Way satellite discovered by the Dark Energy Survey. Using high-resolution spectroscopic observations, we measure the metallicity of the three stars, as well as abundance ratios of several α-elements, iron-peak elements, and neutron-capture elements. The abundance pattern is relatively consistent among all three stars, which have a low average metallicity of [Fe/H] ~ −2.6 and are not α-enhanced ([α/Fe] ~ 0.0). This result is unexpected when compared to other low-metallicity stars in the Galactic halo and other ultrafaint dwarfs and suggests the possibility of a different mechanism for the enrichment of Hor I compared to other satellites. We discuss possible scenarios that could lead to this observed nucleosynthetic signature, including extended star formation, enrichment by a Population III supernova, and or an association with the Large Magellanic Cloud.",
keywords = "astro-ph.SR, astro-ph.GA, RCUK, STFC, AST-1560223",
author = "Nagasawa, {D. Q.} and Marshall, {J. L.} and Simon, {J. D.} and Hansen, {T. T.} and Li, {T. S.} and Bernstein, {R. A.} and E. Balbinot and A. Drlica-Wagner and Pace, {A. B.} and Strigari, {L. E.} and Pellegrino, {C. M.} and DePoy, {D. L.} and Suntzeff, {N. B.} and K. Bechtol and Abbott, {T. M. C.} and Abdalla, {F. B.} and S. Allam and J. Annis and A. Benoit-L{\'e}vy and E. Bertin and D. Brooks and Rosell, {A. Carnero} and Kind, {M. Carrasco} and J. Carretero and Cunha, {C. E.} and D'Andrea, {C. B.} and Costa, {L. N. da} and C. Davis and S. Desai and P. Doel and Eifler, {T. F.} and B. Flaugher and P. Fosalba 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 Hartley, {W. G.} and K. Honscheid and James, {D. J.} and T. Jeltema and E. Krause and K. Kuehn and S. Kuhlmann and N. Kuropatkin and M. March and R. Miquel and B. Nord and A. Roodman and E. Sanchez and B. Santiago and V. Scarpine and R. Schindler and M. Schubnell and I. Sevilla-Noarbe and M. Smith and Smith, {R. C.} and M. Soares-Santos and F. Sobreira and E. Suchyta and G. Tarle and D. Thomas and Tucker, {D. L.} and Walker, {A. R.} and Wechsler, {R. H.} and Wolf, {R. C.} and B. Yanny",
year = "2018",
month = jan,
day = "11",
doi = "10.3847/1538-4357/aaa01d",
language = "English",
volume = "852",
journal = "The Astrophysical Journal",
issn = "0004-637X",
publisher = "IOP Publishing",
number = "2",

}

RIS

TY - JOUR

T1 - Chemical abundance analysis of three α-poor, metal-poor stars in the ultrafaint dwarf galaxy Horologium I

AU - Nagasawa, D. Q.

AU - Marshall, J. L.

AU - Simon, J. D.

AU - Hansen, T. T.

AU - Li, T. S.

AU - Bernstein, R. A.

AU - Balbinot, E.

AU - Drlica-Wagner, A.

AU - Pace, A. B.

AU - Strigari, L. E.

AU - Pellegrino, C. M.

AU - DePoy, D. L.

AU - Suntzeff, N. B.

AU - Bechtol, K.

AU - Abbott, T. M. C.

AU - Abdalla, F. B.

AU - Allam, S.

AU - Annis, J.

AU - Benoit-Lévy, A.

AU - Bertin, E.

AU - Brooks, D.

AU - Rosell, A. Carnero

AU - Kind, M. Carrasco

AU - Carretero, J.

AU - Cunha, C. E.

AU - D'Andrea, C. B.

AU - Costa, L. N. da

AU - Davis, C.

AU - Desai, S.

AU - Doel, P.

AU - Eifler, T. F.

AU - Flaugher, B.

AU - Fosalba, P.

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 - Hartley, W. G.

AU - Honscheid, K.

AU - James, D. J.

AU - Jeltema, T.

AU - Krause, E.

AU - Kuehn, K.

AU - Kuhlmann, S.

AU - Kuropatkin, N.

AU - March, M.

AU - Miquel, R.

AU - Nord, B.

AU - Roodman, A.

AU - Sanchez, E.

AU - Santiago, B.

AU - Scarpine, V.

AU - Schindler, R.

AU - Schubnell, M.

AU - Sevilla-Noarbe, I.

AU - Smith, M.

AU - Smith, R. C.

AU - Soares-Santos, M.

AU - Sobreira, F.

AU - Suchyta, E.

AU - Tarle, G.

AU - Thomas, D.

AU - Tucker, D. L.

AU - Walker, A. R.

AU - Wechsler, R. H.

AU - Wolf, R. C.

AU - Yanny, B.

PY - 2018/1/11

Y1 - 2018/1/11

N2 - We present chemical abundance measurements of three stars in the ultrafaint dwarf galaxy Horologium I, a Milky Way satellite discovered by the Dark Energy Survey. Using high-resolution spectroscopic observations, we measure the metallicity of the three stars, as well as abundance ratios of several α-elements, iron-peak elements, and neutron-capture elements. The abundance pattern is relatively consistent among all three stars, which have a low average metallicity of [Fe/H] ~ −2.6 and are not α-enhanced ([α/Fe] ~ 0.0). This result is unexpected when compared to other low-metallicity stars in the Galactic halo and other ultrafaint dwarfs and suggests the possibility of a different mechanism for the enrichment of Hor I compared to other satellites. We discuss possible scenarios that could lead to this observed nucleosynthetic signature, including extended star formation, enrichment by a Population III supernova, and or an association with the Large Magellanic Cloud.

AB - We present chemical abundance measurements of three stars in the ultrafaint dwarf galaxy Horologium I, a Milky Way satellite discovered by the Dark Energy Survey. Using high-resolution spectroscopic observations, we measure the metallicity of the three stars, as well as abundance ratios of several α-elements, iron-peak elements, and neutron-capture elements. The abundance pattern is relatively consistent among all three stars, which have a low average metallicity of [Fe/H] ~ −2.6 and are not α-enhanced ([α/Fe] ~ 0.0). This result is unexpected when compared to other low-metallicity stars in the Galactic halo and other ultrafaint dwarfs and suggests the possibility of a different mechanism for the enrichment of Hor I compared to other satellites. We discuss possible scenarios that could lead to this observed nucleosynthetic signature, including extended star formation, enrichment by a Population III supernova, and or an association with the Large Magellanic Cloud.

KW - astro-ph.SR

KW - astro-ph.GA

KW - RCUK

KW - STFC

KW - AST-1560223

U2 - 10.3847/1538-4357/aaa01d

DO - 10.3847/1538-4357/aaa01d

M3 - Article

VL - 852

JO - The Astrophysical Journal

JF - The Astrophysical Journal

SN - 0004-637X

IS - 2

M1 - 99

ER -

ID: 8557482