The search for multiple populations in Magellanic Cloud Clusters - III. No evidence for multiple populations in the SMC cluster NGC 419

S. Martocchia; N. Bastian; C. Usher; V. Kozhurina-Platais; F. Niederhofer; I. Cabrera-Ziri; E. Dalessandro; K. Hollyhead; N. Kacharov; C. Lardo; S. Larsen; A. Mucciarelli; I. Platais; M. Salaris; M. Cordero; D. Geisler; M. Hilker; C. Li; D. Mackey

doi:10.1093/mnras/stx660

The search for multiple populations in Magellanic Cloud Clusters - III. No evidence for multiple populations in the SMC cluster NGC 419

S. Martocchia
, N. Bastian
, C. Usher
, V. Kozhurina-Platais
, F. Niederhofer
, I. Cabrera-Ziri
, E. Dalessandro
, K. Hollyhead
, N. Kacharov
, C. Lardo
, S. Larsen
, A. Mucciarelli
, I. Platais
, M. Salaris
, M. Cordero
, D. Geisler
, M. Hilker
, C. Li
, D. Mackey

Research output: Contribution to journal › Article › peer-review

67 Citations (Scopus)

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Abstract

We present the third paper about our ongoing Hubble Space Telescope survey for the search for multiple stellar populations (MPs) within Magellanic Cloud clusters. We report here the analysis of NGC 419, an ~1.5 Gyr old, massive (≳2 × 10⁵ M⊙) star cluster in the Small Magellanic Cloud (SMC). By comparing our photometric data with stellar isochrones, we set a limit on [N/Fe] enhancement of ≲+0.5 dex and hence we find that no MPs are detected in this cluster. This is surprising because in the first two papers of this series, we found evidence for MPs in four other SMC clusters (NGC 121; Lindsay 1, NGC 339, NGC 416), aged from 6 Gyr up to ~10–11 Gyr. This finding raises the question whether age could play a major role in the MPs phenomenon. Additionally, our results appear to exclude mass or environment as the only key factors regulating the existence of a chemical enrichment, since all clusters studied so far in this survey are equally massive (~1-2 × 10⁵ M⊙) and no particular patterns are found when looking at their spatial distribution in the SMC.

Original language	English
Pages (from-to)	3150-3158
Number of pages	9
Journal	Monthly Notices of the Royal Astronomical Society
Volume	468
Issue number	3
DOIs	https://doi.org/10.1093/mnras/stx660
Publication status	Published - Jul 2017

Bibliographical note

Copyright 2017 The Authors. First published in Monthly notices of the Royal Astronomical Society, 468(3), pp. 3150-3158. The original publication is available at https://doi.org/10.1093/mnras/stx660, published by Oxford University Press on behalf of the Royal Astronomical Society. 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.

Keywords

stars: abundances
Hertzsprung-Russell and colour-magnitude diagrams
galaxies: individual: SMC
galaxies: star clusters: individual: NGC 419

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10.1093/mnras/stx660

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Cite this

Martocchia, S., Bastian, N., Usher, C., Kozhurina-Platais, V., Niederhofer, F., Cabrera-Ziri, I., Dalessandro, E., Hollyhead, K., Kacharov, N., Lardo, C., Larsen, S., Mucciarelli, A., Platais, I., Salaris, M., Cordero, M., Geisler, D., Hilker, M., Li, C., & Mackey, D. (2017). The search for multiple populations in Magellanic Cloud Clusters - III. No evidence for multiple populations in the SMC cluster NGC 419. Monthly Notices of the Royal Astronomical Society, 468(3), 3150-3158. https://doi.org/10.1093/mnras/stx660

@article{fbe8f8257dc54f38ac8dab659e94ea58,

title = "The search for multiple populations in Magellanic Cloud Clusters - III. No evidence for multiple populations in the SMC cluster NGC 419",

abstract = "We present the third paper about our ongoing Hubble Space Telescope survey for the search for multiple stellar populations (MPs) within Magellanic Cloud clusters. We report here the analysis of NGC 419, an \textasciitilde{}1.5 Gyr old, massive (≳2 × 105 M⊙) star cluster in the Small Magellanic Cloud (SMC). By comparing our photometric data with stellar isochrones, we set a limit on [N/Fe] enhancement of ≲+0.5 dex and hence we find that no MPs are detected in this cluster. This is surprising because in the first two papers of this series, we found evidence for MPs in four other SMC clusters (NGC 121; Lindsay 1, NGC 339, NGC 416), aged from 6 Gyr up to \textasciitilde{}10–11 Gyr. This finding raises the question whether age could play a major role in the MPs phenomenon. Additionally, our results appear to exclude mass or environment as the only key factors regulating the existence of a chemical enrichment, since all clusters studied so far in this survey are equally massive (\textasciitilde{}1-2 × 105 M⊙) and no particular patterns are found when looking at their spatial distribution in the SMC.",

keywords = "stars: abundances, Hertzsprung-Russell and colour-magnitude diagrams, galaxies: individual: SMC, galaxies: star clusters: individual: NGC 419",

author = "S. Martocchia and N. Bastian and C. Usher and V. Kozhurina-Platais and F. Niederhofer and I. Cabrera-Ziri and E. Dalessandro and K. Hollyhead and N. Kacharov and C. Lardo and S. Larsen and A. Mucciarelli and I. Platais and M. Salaris and M. Cordero and D. Geisler and M. Hilker and C. Li and D. Mackey",

note = "Copyright 2017 The Authors. First published in Monthly notices of the Royal Astronomical Society, 468(3), pp. 3150-3158. The original publication is available at https://doi.org/10.1093/mnras/stx660, published by Oxford University Press on behalf of the Royal Astronomical Society. 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 = "2017",

month = jul,

doi = "10.1093/mnras/stx660",

language = "English",

volume = "468",

pages = "3150--3158",

journal = "Monthly Notices of the Royal Astronomical Society",

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Martocchia, S, Bastian, N, Usher, C, Kozhurina-Platais, V, Niederhofer, F, Cabrera-Ziri, I, Dalessandro, E, Hollyhead, K, Kacharov, N, Lardo, C, Larsen, S, Mucciarelli, A, Platais, I, Salaris, M, Cordero, M, Geisler, D, Hilker, M, Li, C & Mackey, D 2017, 'The search for multiple populations in Magellanic Cloud Clusters - III. No evidence for multiple populations in the SMC cluster NGC 419', Monthly Notices of the Royal Astronomical Society, vol. 468, no. 3, pp. 3150-3158. https://doi.org/10.1093/mnras/stx660

TY - JOUR

T1 - The search for multiple populations in Magellanic Cloud Clusters - III. No evidence for multiple populations in the SMC cluster NGC 419

AU - Martocchia, S.

AU - Bastian, N.

AU - Usher, C.

AU - Kozhurina-Platais, V.

AU - Niederhofer, F.

AU - Cabrera-Ziri, I.

AU - Dalessandro, E.

AU - Hollyhead, K.

AU - Kacharov, N.

AU - Lardo, C.

AU - Larsen, S.

AU - Mucciarelli, A.

AU - Platais, I.

AU - Salaris, M.

AU - Cordero, M.

AU - Geisler, D.

AU - Hilker, M.

AU - Li, C.

AU - Mackey, D.

N1 - Copyright 2017 The Authors. First published in Monthly notices of the Royal Astronomical Society, 468(3), pp. 3150-3158. The original publication is available at https://doi.org/10.1093/mnras/stx660, published by Oxford University Press on behalf of the Royal Astronomical Society. 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 - 2017/7

Y1 - 2017/7

N2 - We present the third paper about our ongoing Hubble Space Telescope survey for the search for multiple stellar populations (MPs) within Magellanic Cloud clusters. We report here the analysis of NGC 419, an ~1.5 Gyr old, massive (≳2 × 105 M⊙) star cluster in the Small Magellanic Cloud (SMC). By comparing our photometric data with stellar isochrones, we set a limit on [N/Fe] enhancement of ≲+0.5 dex and hence we find that no MPs are detected in this cluster. This is surprising because in the first two papers of this series, we found evidence for MPs in four other SMC clusters (NGC 121; Lindsay 1, NGC 339, NGC 416), aged from 6 Gyr up to ~10–11 Gyr. This finding raises the question whether age could play a major role in the MPs phenomenon. Additionally, our results appear to exclude mass or environment as the only key factors regulating the existence of a chemical enrichment, since all clusters studied so far in this survey are equally massive (~1-2 × 105 M⊙) and no particular patterns are found when looking at their spatial distribution in the SMC.

AB - We present the third paper about our ongoing Hubble Space Telescope survey for the search for multiple stellar populations (MPs) within Magellanic Cloud clusters. We report here the analysis of NGC 419, an ~1.5 Gyr old, massive (≳2 × 105 M⊙) star cluster in the Small Magellanic Cloud (SMC). By comparing our photometric data with stellar isochrones, we set a limit on [N/Fe] enhancement of ≲+0.5 dex and hence we find that no MPs are detected in this cluster. This is surprising because in the first two papers of this series, we found evidence for MPs in four other SMC clusters (NGC 121; Lindsay 1, NGC 339, NGC 416), aged from 6 Gyr up to ~10–11 Gyr. This finding raises the question whether age could play a major role in the MPs phenomenon. Additionally, our results appear to exclude mass or environment as the only key factors regulating the existence of a chemical enrichment, since all clusters studied so far in this survey are equally massive (~1-2 × 105 M⊙) and no particular patterns are found when looking at their spatial distribution in the SMC.

KW - stars: abundances

KW - Hertzsprung-Russell and colour-magnitude diagrams

KW - galaxies: individual: SMC

KW - galaxies: star clusters: individual: NGC 419

UR - https://www.scopus.com/pages/publications/85034035834

U2 - 10.1093/mnras/stx660

DO - 10.1093/mnras/stx660

M3 - Article

SN - 0035-8711

VL - 468

SP - 3150

EP - 3158

JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

IS - 3

ER -

The search for multiple populations in Magellanic Cloud Clusters - III. No evidence for multiple populations in the SMC cluster NGC 419

Abstract

Bibliographical note

Keywords

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