Chemical analysis of the brightest star of the Cetus II ultrafaint dwarf galaxy candidate

K. B. Webber; T. T. Hansen; J. L. Marshall; J. D. Simon; A. B. Pace; B. Mutlu-Pakdil; A. Drlica-Wagner; C. E. Martínez-Vázquez; M. Aguena; S. S. Allam; O. Alves; E. Bertin; D. Brooks; A. Carnero Rosell; J. Carretero; L. N. da Costa; J. De Vicente; P. Doel; I. Ferrero; D. Friedel; J. Frieman; J. García-Bellido; G. Giannini; D. Gruen; R. A. Gruendl; S. R. Hinton; D. L. Hollowood; K. Honscheid; K. Kuehn; J. Mena-Fernández; F. Menanteau; R. Miquel; R. L. C. Ogando; M. E. S. Pereira; A. Pieres; A. A. Plazas Malagón; E. Sanchez; B. Santiago; J. Allyn Smith; M. Smith; E. Suchyta; G. Tarle; C. To; N. Weaverdyck; B. Yanny

doi:10.3847/1538-4357/ad0385

Chemical analysis of the brightest star of the Cetus II ultrafaint dwarf galaxy candidate

K. B. Webber, T. T. Hansen, J. L. Marshall, J. D. Simon, A. B. Pace, B. Mutlu-Pakdil, A. Drlica-Wagner, C. E. Martínez-Vázquez, M. Aguena, S. S. Allam, O. Alves, E. Bertin, D. Brooks, A. Carnero Rosell, J. Carretero, L. N. da Costa, J. De Vicente, P. Doel, I. Ferrero, D. FriedelJ. Frieman, J. García-Bellido, G. Giannini, D. Gruen, R. A. Gruendl, S. R. Hinton, D. L. Hollowood, K. Honscheid, K. Kuehn, J. Mena-Fernández, F. Menanteau, R. Miquel, R. L. C. Ogando, M. E. S. Pereira, A. Pieres, A. A. Plazas Malagón, E. Sanchez, B. Santiago, J. Allyn Smith, M. Smith, E. Suchyta, G. Tarle, C. To, N. Weaverdyck, B. Yanny

Australian Astronomical Optics

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Abstract

We present a detailed chemical abundance analysis of the brightest star in the ultrafaint dwarf (UFD) galaxy candidate Cetus II from high-resolution Magellan/MIKE spectra. For this star, DES J011740.53-173053, abundances or upper limits of 18 elements from carbon to europium are derived. Its chemical abundances generally follow those of other UFD galaxy stars, with a slight enhancement of the α-elements (Mg, Si, and Ca) and low neutron-capture element (Sr, Ba, and Eu) abundances supporting the classification of Cetus II as a likely UFD. The star exhibits lower Sc, Ti, and V abundances than Milky Way (MW) halo stars with similar metallicity. This signature is consistent with yields from a supernova originating from a star with a mass of ∼11.2 M⊙. In addition, the star has a potassium abundance of [K/Fe] = 0.81, which is somewhat higher than the K abundances of MW halo stars with similar metallicity, a signature that is also present in a number of UFD galaxies. A comparison including globular clusters and stellar stream stars suggests that high K is a specific characteristic of some UFD galaxy stars and can thus be used to help classify objects as UFD galaxies.

Original language	English
Article number	141
Pages (from-to)	1-11
Number of pages	11
Journal	Astrophysical Journal
Volume	959
Issue number	2
DOIs	https://doi.org/10.3847/1538-4357/ad0385
Publication status	Published - 20 Dec 2023

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Copyright the Author(s) 2023. Version archived for private and non-commercial use with the permission of the author/s and according to publisher conditions. For further rights please contact the publisher.

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10.3847/1538-4357/ad0385Licence: CC BY

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Webber, K. B., Hansen, T. T., Marshall, J. L., Simon, J. D., Pace, A. B., Mutlu-Pakdil, B., Drlica-Wagner, A., Martínez-Vázquez, C. E., Aguena, M., Allam, S. S., Alves, O., Bertin, E., Brooks, D., Carnero Rosell, A., Carretero, J., da Costa, L. N., De Vicente, J., Doel, P., Ferrero, I., ... Yanny, B. (2023). Chemical analysis of the brightest star of the Cetus II ultrafaint dwarf galaxy candidate. Astrophysical Journal, 959(2), 1-11. Article 141. https://doi.org/10.3847/1538-4357/ad0385

@article{cb95d0b5bc33472c89f915d1b8c6832b,

title = "Chemical analysis of the brightest star of the Cetus II ultrafaint dwarf galaxy candidate",

abstract = "We present a detailed chemical abundance analysis of the brightest star in the ultrafaint dwarf (UFD) galaxy candidate Cetus II from high-resolution Magellan/MIKE spectra. For this star, DES J011740.53-173053, abundances or upper limits of 18 elements from carbon to europium are derived. Its chemical abundances generally follow those of other UFD galaxy stars, with a slight enhancement of the α-elements (Mg, Si, and Ca) and low neutron-capture element (Sr, Ba, and Eu) abundances supporting the classification of Cetus II as a likely UFD. The star exhibits lower Sc, Ti, and V abundances than Milky Way (MW) halo stars with similar metallicity. This signature is consistent with yields from a supernova originating from a star with a mass of ∼11.2 M⊙. In addition, the star has a potassium abundance of [K/Fe] = 0.81, which is somewhat higher than the K abundances of MW halo stars with similar metallicity, a signature that is also present in a number of UFD galaxies. A comparison including globular clusters and stellar stream stars suggests that high K is a specific characteristic of some UFD galaxy stars and can thus be used to help classify objects as UFD galaxies.",

author = "Webber, {K. B.} and Hansen, {T. T.} and Marshall, {J. L.} and Simon, {J. D.} and Pace, {A. B.} and B. Mutlu-Pakdil and A. Drlica-Wagner and Mart{\'i}nez-V{\'a}zquez, {C. E.} and M. Aguena and Allam, {S. S.} and O. Alves and E. Bertin and D. Brooks and {Carnero Rosell}, A. and J. Carretero and {da Costa}, {L. N.} and {De Vicente}, J. and P. Doel and I. Ferrero and D. Friedel and J. Frieman and J. Garc{\'i}a-Bellido and G. Giannini and D. Gruen and Gruendl, {R. A.} and Hinton, {S. R.} and Hollowood, {D. L.} and K. Honscheid and K. Kuehn and J. Mena-Fern{\'a}ndez and F. Menanteau and R. Miquel and Ogando, {R. L. C.} and Pereira, {M. E. S.} and A. Pieres and {Plazas Malag{\'o}n}, {A. A.} and E. Sanchez and B. Santiago and {Allyn Smith}, J. and M. Smith and E. Suchyta and G. Tarle and C. To and N. Weaverdyck and B. Yanny",

note = "Copyright the Author(s) 2023. Version archived for private and non-commercial use with the permission of the author/s and according to publisher conditions. For further rights please contact the publisher.",

year = "2023",

month = dec,

day = "20",

doi = "10.3847/1538-4357/ad0385",

language = "English",

volume = "959",

pages = "1--11",

journal = "Astrophysical Journal",

issn = "0004-637X",

publisher = "IOP Publishing",

number = "2",

}

Webber, KB, Hansen, TT, Marshall, JL, Simon, JD, Pace, AB, Mutlu-Pakdil, B, Drlica-Wagner, A, Martínez-Vázquez, CE, Aguena, M, Allam, SS, Alves, O, Bertin, E, Brooks, D, Carnero Rosell, A, Carretero, J, da Costa, LN, De Vicente, J, Doel, P, Ferrero, I, Friedel, D, Frieman, J, García-Bellido, J, Giannini, G, Gruen, D, Gruendl, RA, Hinton, SR, Hollowood, DL, Honscheid, K, Kuehn, K, Mena-Fernández, J, Menanteau, F, Miquel, R, Ogando, RLC, Pereira, MES, Pieres, A, Plazas Malagón, AA, Sanchez, E, Santiago, B, Allyn Smith, J, Smith, M, Suchyta, E, Tarle, G, To, C, Weaverdyck, N & Yanny, B 2023, 'Chemical analysis of the brightest star of the Cetus II ultrafaint dwarf galaxy candidate', Astrophysical Journal, vol. 959, no. 2, 141, pp. 1-11. https://doi.org/10.3847/1538-4357/ad0385

TY - JOUR

T1 - Chemical analysis of the brightest star of the Cetus II ultrafaint dwarf galaxy candidate

AU - Webber, K. B.

AU - Hansen, T. T.

AU - Marshall, J. L.

AU - Simon, J. D.

AU - Pace, A. B.

AU - Mutlu-Pakdil, B.

AU - Drlica-Wagner, A.

AU - Martínez-Vázquez, C. E.

AU - Aguena, M.

AU - Allam, S. S.

AU - Alves, O.

AU - Bertin, E.

AU - Brooks, D.

AU - Carnero Rosell, A.

AU - Carretero, J.

AU - da Costa, L. N.

AU - De Vicente, J.

AU - Doel, P.

AU - Ferrero, I.

AU - Friedel, D.

AU - Frieman, J.

AU - García-Bellido, J.

AU - Giannini, G.

AU - Gruen, D.

AU - Gruendl, R. A.

AU - Hinton, S. R.

AU - Hollowood, D. L.

AU - Honscheid, K.

AU - Kuehn, K.

AU - Mena-Fernández, J.

AU - Menanteau, F.

AU - Miquel, R.

AU - Ogando, R. L. C.

AU - Pereira, M. E. S.

AU - Pieres, A.

AU - Plazas Malagón, A. A.

AU - Sanchez, E.

AU - Santiago, B.

AU - Allyn Smith, J.

AU - Smith, M.

AU - Suchyta, E.

AU - Tarle, G.

AU - To, C.

AU - Weaverdyck, N.

AU - Yanny, B.

N1 - Copyright the Author(s) 2023. Version archived for private and non-commercial use with the permission of the author/s and according to publisher conditions. For further rights please contact the publisher.

PY - 2023/12/20

Y1 - 2023/12/20

N2 - We present a detailed chemical abundance analysis of the brightest star in the ultrafaint dwarf (UFD) galaxy candidate Cetus II from high-resolution Magellan/MIKE spectra. For this star, DES J011740.53-173053, abundances or upper limits of 18 elements from carbon to europium are derived. Its chemical abundances generally follow those of other UFD galaxy stars, with a slight enhancement of the α-elements (Mg, Si, and Ca) and low neutron-capture element (Sr, Ba, and Eu) abundances supporting the classification of Cetus II as a likely UFD. The star exhibits lower Sc, Ti, and V abundances than Milky Way (MW) halo stars with similar metallicity. This signature is consistent with yields from a supernova originating from a star with a mass of ∼11.2 M⊙. In addition, the star has a potassium abundance of [K/Fe] = 0.81, which is somewhat higher than the K abundances of MW halo stars with similar metallicity, a signature that is also present in a number of UFD galaxies. A comparison including globular clusters and stellar stream stars suggests that high K is a specific characteristic of some UFD galaxy stars and can thus be used to help classify objects as UFD galaxies.

AB - We present a detailed chemical abundance analysis of the brightest star in the ultrafaint dwarf (UFD) galaxy candidate Cetus II from high-resolution Magellan/MIKE spectra. For this star, DES J011740.53-173053, abundances or upper limits of 18 elements from carbon to europium are derived. Its chemical abundances generally follow those of other UFD galaxy stars, with a slight enhancement of the α-elements (Mg, Si, and Ca) and low neutron-capture element (Sr, Ba, and Eu) abundances supporting the classification of Cetus II as a likely UFD. The star exhibits lower Sc, Ti, and V abundances than Milky Way (MW) halo stars with similar metallicity. This signature is consistent with yields from a supernova originating from a star with a mass of ∼11.2 M⊙. In addition, the star has a potassium abundance of [K/Fe] = 0.81, which is somewhat higher than the K abundances of MW halo stars with similar metallicity, a signature that is also present in a number of UFD galaxies. A comparison including globular clusters and stellar stream stars suggests that high K is a specific characteristic of some UFD galaxy stars and can thus be used to help classify objects as UFD galaxies.

UR - http://www.scopus.com/inward/record.url?scp=85180565252&partnerID=8YFLogxK

U2 - 10.3847/1538-4357/ad0385

DO - 10.3847/1538-4357/ad0385

M3 - Article

SN - 0004-637X

VL - 959

SP - 1

EP - 11

JO - Astrophysical Journal

JF - Astrophysical Journal

IS - 2

M1 - 141

ER -

Chemical analysis of the brightest star of the Cetus II ultrafaint dwarf galaxy candidate

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