Helmi, prof. dr. Amina
Amina Helmi (1970) is hoogleraar Dynamica, structuur en vorming van de Melkweg. Helmi schreef een baanbrekend proefschrift (waarvoor ze de Christiaan Huygens-prijs 2004 ontving) waarin de geschiedenis en het ontstaan van onze Melkweg in een nieuw licht werden geplaatst: ons Melkwegstelstel is waarschijnlijk geleidelijk aangegroeid met kleinere sterrenstelsels. Helmi spoort die aparte sterrenstelsels ('fossielen') op en bedrijft dus een soort astro-archeologie; ze gebruikt de informatie van sterfossielen om het ontstaan van de Melkweg te reconstrueren.
Spinozalaureaat 2019 - Amina Helmi
Nieuwe inzichten - Formatie van de Melkweg
“Deze dag zet de sterrenkunde in een heel ander daglicht”
Helmi over het einde van de wereld
Helmi heeft een aantal gerenommeerde subsidies ontvangen, zoals een Vidi in 2003 en, in 2009, een ERC Starting Grant van de EU. Ze is actief in allerlei internationale netwerken en is in 2017 benoemd tot lid van de Koninklijke Nederlandse Akademie van Wetenschappen. Een team met Amina Helmi bracht in augustus 2014 in Science voor het eerst de ruimtelijke verdeling van de onbekende materie tussen de sterren in beeld. Helmi is nauw betrokken bij de in 2013 gelanceerde GAIA-telescoop die met zeer preciese metingen het Melkwegstelsel in kaart brengt. In 2015 ontving ze voor haar onderzoek hiernaar een Vici-subsidie en in 2017 opnieuw een NWO-subsidie. In 2018 kreeg ze met haar onderzoeksgroep als een van de eersten de gelegenheid om de tweede set gegevens van de GAIA-telescoop te bestuderen.
De Melkweg werd altijd gezien als een relatief onveranderlijk spiraalstelsel. Het onderzoek van Helmi en haar collega’s heeft dat beeld fundamenteel veranderd. Door de bewegingen en eigenschappen van miljoenen sterren te analyseren, ontdekten zij de overblijfselen van kleinere sterrenstelsels die in het verre verleden door de Melkweg zijn opgeslokt.
Deze zogenoemde ‘sterrenstromen’ vormen fossiele sporen van kosmische botsingen die in het verleden hebben plaatsgevonden. Op deze manier bieden sterrenstromen een gedetailleerd overzicht van de fusiegeschiedenis van het sterrenstelsel.
Een van Helmi’s meest invloedrijke bijdragen was de ontdekking van Gaia-Enceladus, een groot sterrenstelsel dat ongeveer tien miljard jaar geleden met de jonge Melkweg botste. Deze ontdekking, mogelijk gemaakt door gegevens van de Europese ruimtemissie Gaia, wordt beschouwd als een mijlpaal in ons begrip van de vorming van ons sterrenstelsel.
Voor haar baanbrekende onderzoek ontving Helmi in 2019 de Spinozapremie, de 'Nederlandse Nobelprijs'. In 2026 ontving ze de prestigieuze Kavli-prijs voor astrofysica, samen met Vasily Belokurov (University of Cambridge) en Rodrigo Ibata (Université de Strasbourg). Volgens het Kavli Prize Committee heeft het onderzoek van Helmi en haar medewinnaars 'ons begrip van hoe grote sterrenstelsels zoals de Melkweg zijn ontstaan fundamenteel veranderd.' Sterrenstelsels worden niet langer gezien als statische systemen, maar als dynamische structuren die voortdurend veranderen door kosmische interacties.
Eerder in het nieuws
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Amina Helmi en haar team opnieuw betrokken bij nieuwste data Release van Gaia-missie RUG-nieuws, juni 2022
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Spinozapremie 2019 voor astronome Amina Helmi RUG-nieuws, juni 2019
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'Smoking gun'. Amina Helmi wist dat ze moest wachten op Gaia Broerstraat 5, december 2019
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Sterrenkundigen vinden de reus die de jonge Melkweg zijn vorm gaf RUG-nieuws, oktober 2018
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Klein sterrenstelsel maakte 'slakkenhuis' in onze hoek van Melkweg RUG-nieuws, september 2018
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Revolutie in de sterrenkunde door nieuwe metingen RUG-nieuws, april 2018
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Helmi benoemd tot lid KNAW RUG-nieuws, mei 2017
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Groningse sterrenkundige Amina Helmi mede-ontdekker van nieuwe sterrenstroom in de Melkweg RUG-nieuws, 2 februari 2011
Contact en meer informatie
Publicaties
2026
Wempe,
E., White, S. D. M., Helmi, A., Lavaux, G.,
& Jasche, J. (2026). The mass distribution in and around
the Local Group. Nature Astronomy. https://doi.org/10.1038/s41550-025-02770-w
2025
Bayer,
M., Starkenburg, E., Thomas, G. F., Martin, N.
F., Helmi, A., Byström, A., de Boer, T.,
Fernández Alvar, E., Gwyn, S., Ibata, R., Jablonka, P.,
Kordopatis, G., Matsuno, T., McConnachie, A. W., Medina, G.
E., Rusterucci, S., Sánchez-Janssen, R., Sestito,
F., & Viswanathan, A. (2025). A Pristine-UNIONS view on
the Galaxy: Kinematics of the distant spur feature of the
Sagittarius stream traced by blue horizontal branch stars.
Astronomy & Astrophysics, 701,
Article A117. https://doi.org/10.1051/0004-6361/202554131
Ceccarelli,
E., Massari, D., Palla, M., Mucciarelli, A., Bellazzini, M.,
& Helmi, A. (2025). A Walk on the Retrograde Side
(WRS) project: II. Chemistry to disentangle in situ and accreted
components in Thamnos. Astronomy and
Astrophysics, 704, Article A180. https://doi.org/10.1051/0004-6361/202556685
Dodd,
E., Ruiz-Lara, T., Helmi, A., Gallart,
C., Callingham, T. M., Cassisi, S.,
Fernández-Alvar, E., & Surot, F. (2025).
Characterisation of local halo building blocks: Thamnos and
Sequoia. Astronomy & Astrophysics,
698, Article A277. https://doi.org/10.1051/0004-6361/202451978
Dodd,
E., Matsuno, T., Helmi, A., Balbinot,
E., Callingham, T. M., Starkenburg,
E., Woudenberg, H. C., & Ruiz-Lara, T.
(2025). Chemical characterisation of small substructures in
the local stellar halo. Astronomy &
Astrophysics, 700, Article A154. https://doi.org/10.1051/0004-6361/202554252
González-Koda,
Y. K., Ruiz-Lara, T., Gallart, C., Ceccarelli,
E., Dodd, E., Fernández-Alvar, E., Cassisi, S.,
Surot, F., Aguado-Agelet, F., Massari, D., Monelli,
M., Callingham, T. M., Helmi, A.,
Aznar-Menargues, G., Mirabal, D., Rivero, A., & Queiroz, A. B.
(2025). Chronology of our Galaxy from Gaia
colour-magnitude diagram fitting (ChronoGal): III. Age and
metallicity distribution of Gaia-Sausage-Enceladus stars near the
Sun. Astronomy and Astrophysics,
704, Article A259. https://doi.org/10.1051/0004-6361/202554272
Fernández-Alvar,
E., Ruiz-Lara, T., Gallart, C., Cassisi, S., Surot,
F., González-Koda, Y. K., Callingham, T. M.,
Queiroz, A. B., Battaglia, G., Thomas, G., Chiappini, C., Hill,
V., Dodd, E., Helmi, A., Aznar-Menargues,
G., De La Cueva, A., Mirabal, D., Quintana-Ansaldo, M., &
Rivero, A. (2025). Chronology of our Galaxy from Gaia
colour–magnitude diagram fitting (ChronoGal) : II.
Unveiling the formation and evolution of the kinematically selected
thick and thin discs. Astronomy and
Astrophysics, 704, Article A258. https://doi.org/10.1051/0004-6361/202553814
Callingham,
T. M., & Helmi, A. (2025). Group
accretion in Milky Way-like stellar haloes.
Astronomy & Astrophysics, 700,
Article A175. https://doi.org/10.1051/0004-6361/202554966
Lindsay,
C. J., Hon, M., Ong, J. M. J., García, R. A.,
Palakkatharappil, D. B., Yu, J., Li, T., Ruiz-Lara, T., &
Helmi, A. (2025). Precise Asteroseismic Ages for the
Helmi Streams. Astrophysical Journal,
989(2), Article 189. https://doi.org/10.3847/1538-4357/adeb56
Nizovkina,
M., Larsen, S. S., Brown, A. G. A., & Helmi, A.
(2025). Refining open cluster parameters with Gaia XP
metallicities. Astronomy &
Astrophysics, 703, Article A100. https://doi.org/10.1051/0004-6361/202555437
Woudenberg,
H. C., & Helmi, A. (2025). The chaos
induced by the Galactic bar on the orbits of nearby halo
stars. Astronomy & Astrophysics,
700, Article A240. https://doi.org/10.1051/0004-6361/202555672
Wempe,
E., Helmi, A., White, S. D. M., Jasche, J.,
& Lavaux, G. (2025). The effect of environment on the
mass assembly history of the Milky Way and M31.
Astronomy & Astrophysics, 701,
Article A178. https://doi.org/10.1051/0004-6361/202553744
Montelius,
M., Starkenburg, E., Woudenberg, H.
C., Angrilli Muglia, A., Ardern-Arentsen, A.,
Viswanathan, A., Byström, A., Helmi, A.,
Martin, N., Matsuno, T., Navarrete, C., & Navarro,
J. (2025). The metal-poor tail of the APOGEE survey : I.
Uncovering [Fe/H] < –2.5 stars from the inner Galaxy to
the Magellanic Clouds. Astronomy and
Astrophysics, 704, Article A44. https://doi.org/10.1051/0004-6361/202556198
Matsuno,
T., Kemp, A., Tanikawa, A., Shariat, C. E., El-Badry, K. J.,
Dodd, E., Helmi, A., Koch-Hansen, A. J.,
Yamaguchi, N., & Yan, H. (2025). Unevolved Li-rich stars
at low metallicity: A possible formation pathway through
novae. Astronomy & Astrophysics,
699, Article A171. https://doi.org/10.1051/0004-6361/202554264
2024
Koop,
O., Antoja, T., Helmi, A., Callingham, T.
M., & Laporte, C. F. P. (2024). Assessing the
robustness of the Galactic rotation curve inferred from the Jeans
equations using Gaia DR3 and cosmological simulations.
Astronomy & Astrophysics, 692,
Article A50. https://doi.org/10.1051/0004-6361/202450911
Gallart,
C., Surot, F., Cassisi, S., Fernández-Alvar, E., Mirabal, D.,
Rivero, A., Ruiz-Lara, T., Santos-Torres, J., Aznar-Menargues, G.,
Battaglia, G., Queiroz, A. B., Monelli, M., Vasiliev, E.,
Chiappini, C., Helmi, A., Hill, V., Massari, D., &
Thomas, G. F. (2024). Chronology of our Galaxy from Gaia
colour-magnitude diagram fitting (ChronoGal): I. the formation and
evolution of the thin disc from the Gaia Catalogue of Nearby
Stars. Astronomy & Astrophysics,
687, Article A168. https://doi.org/10.1051/0004-6361/202349078
Wempe,
E., Lavaux, G., White, S. D. M., Helmi, A.,
Jasche, J., & Stopyra, S. (2024). Constrained
cosmological simulations of the Local Group using Bayesian
hierarchical field-level inference. Astronomy
& Astrophysics, 691, Article A348. https://doi.org/10.1051/0004-6361/202450975
Gaia
Collaboration, Panuzzo, P., Mazeh, T., Arenou, F., Holl, B.,
Caffau, E., Jorissen, A., Babusiaux, C., Balbinot,
E., Helmi, A., & Khanna, S. (2024).
Discovery of a dormant 33 solar-mass black hole in
pre-release Gaia astrometry. Astronomy &
Astrophysics, 686, Article L2. https://doi.org/10.1051/0004-6361/202449763
Euclid
Collaboration, Mellier, Y., Abdurro’uf, Barroso, J. A.
A., Balbinot, E., Belikov, A. N.,
Buddelmeijer, H., Caputi, K. I.,
Corcho-Caballero, P., Dayal, P.,
Dröge, B., Helmi, A., Koopmans, L.
V. E., La Marca, A., Nagam, B.
C., Nutma, T., Peletier, R.
F., Saifollahi, T., Shulevski,
A., ... Williams, O. R. (2024).
Euclid. I. Overview of the Euclid mission.
arXiv. https://doi.org/10.48550/arXiv.2405.13491
Callingham,
T. M., & Helmi, A. (2024). Filling in
the blanks: A method to infer the substructure membership and
dynamics of 5D stars. Astronomy &
Astrophysics, 690, Article A98. https://doi.org/10.1051/0004-6361/202450745
Woudenberg,
H. C., & Helmi, A. (2024). First
measurement of the triaxiality of the inner dark matter halo of the
Milky Way. Astronomy &
Astrophysics, 691, Article A277. https://doi.org/10.1051/0004-6361/202451743
Gaia
Collaboration, Krone-Martins, A., Ducourant, C., Galluccio, L.,
Delchambre, L., Oreshina-Slezak, I., Teixeira, R., Braine, J.,
Khanna, S., & Helmi, A. (2024). Gaia Focused
Product Release: A catalogue of sources around quasars to search
for strongly lensed quasars. Astronomy &
Astrophysics, 685, Article A130. https://doi.org/10.1051/0004-6361/202347273
Matsuno,
T., Starkenburg, E., Balbinot,
E., & Helmi, A. (2024). Improving
metallicity estimates for very metal-poor stars in the Gaia DR3
GSP-Spec catalog. Astronomy &
Astrophysics, 685, Article A59. https://doi.org/10.1051/0004-6361/202245762
Koop,
O., & Helmi, A. (2024). Testing MOND
using the dynamics of nearby stellar streams.
Astronomy & Astrophysics, 689,
Article A57. https://doi.org/10.1051/0004-6361/202348211
Balbinot,
E., Dodd, E., Matsuno, T., Lardo, C.,
Helmi, A., Panuzzo, P., Mazeh, T., Holl, B., Caffau, E.,
Jorissen, A., Babusiaux, C., Gavras, P., Wyrzykowski, L., Eyer, L.,
Leclerc, N., Bombrun, A., Mowlavi, N., Seabroke, G. M.,
Cabrera-Ziri, I., ... Starkenburg, E. (2024).
The 33 M black hole Gaia BH3 is part of the disrupted ED-2
star cluster. Astronomy &
Astrophysics, 687, Article L3. https://doi.org/10.1051/0004-6361/202450425
Grønnow,
A., Fraternali, F., Marinacci, F.,
Pezzulli, G., Tolstoy, E., Helmi,
A., & Brown, A. G. A. (2024). The density of the
Milky Way’s corona at z ≈ 1.6 through ram pressure
stripping of the Draco dSph galaxy. Monthly
Notices of the Royal Astronomical Society,
528(2), 3009-3027. https://doi.org/10.1093/mnras/stae073
2023
The
WEAVE Instrumentation & Survey Consortia, Jin,
S., Trager, S. C., Dalton, G. B., Aguerri, J.
A. L., Drew, J. E., Falcón-Barroso, J., Gänsicke, B. T.,
Hess, K. M., Balbinot, E., Helmi,
A., Matsuno, T., Peletier, R.
F., Starkenburg, E., & Tolstoy,
E. (2024). The wide-field, multiplexed, spectroscopic
facility WEAVE: Survey design, overview, and simulated
implementation. Monthly Notices of the Royal
Astronomical Society, 530(3), 2688-2730. https://doi.org/10.1093/mnras/stad557
Tolstoy,
E., Skúladóttir, Á., Battaglia, G., Brown, A.
G. A., Massari, D., Irwin, M. J., Starkenburg,
E., Salvadori, S., Hill, V., Jablonka, P., Salaris, M., van
Essen, T., Olsthoorn, C., Helmi, A., & Pritchard,
J. (2023). A 3D view of dwarf galaxies with Gaia and
VLT/FLAMES. I. The Sculptor dwarf spheroidal.
Astronomy & Astrophysics, 675,
Article A49. https://doi.org/10.1051/0004-6361/202245717
Woudenberg,
H. C., Koop, O., Balbinot,
E., & Helmi, A. (2023).
Characterization and dynamics of the peculiar stream Jhelum:
A tentative role for the Sagittarius dwarf galaxy.
Astronomy & Astrophysics, 669,
Article A102. https://doi.org/10.1051/0004-6361/202243266
Balbinot,
E., Helmi, A., Callingham,
T., Matsuno, T., Dodd, E.,
& Ruiz-Lara, T. (2023). ED-2: A cold but not so
narrow stellar stream crossing the solar neighbourhood.
Astronomy & Astrophysics, 678,
Article A115. https://doi.org/10.1051/0004-6361/202347076
Babusiaux,
C., Fabricius, C., Khanna, S., Muraveva, T., Reylé, C., Spoto,
F., Vallenari, A., Luri, X., Arenou, F., Álvarez, M. A.,
Anders, F., Antoja, T., Balbinot, E., Barache, C.,
Bauchet, N., Bossini, D., Busonero, D., Cantat-Gaudin, T.,
Carrasco, J. M., ... Weiler, M. (2023). Gaia Data Release 3:
Catalogue validation. Astronomy &
Astrophysics, 674, Article A32. https://doi.org/10.1051/0004-6361/202243790
Gaia
Collaboration, Creevey, O. L., Sarro, L. M., Lobel, A., Pancino,
E., Andrae, R., Smart, R. L., Clementini, G., Balbinot,
E., Helmi, A., & Khanna, S. (2023).
Gaia Data Release 3: A golden sample of astrophysical
parameters. Astronomy &
Astrophysics, 674, Article A39. https://doi.org/10.1051/0004-6361/202243800
Gaia
Collaboration, Recio-Blanco, A., Kordopatis, G., de Laverny, P.,
Palicio, P. A., Spagna, A., Spina, L., Katz, D., Balbinot,
E., Helmi, A., & Khanna, S. (2023).
Gaia Data Release 3: Chemical cartography of the Milky
Way. Astronomy & Astrophysics,
674, Article A38. https://doi.org/10.1051/0004-6361/202243511
Gaia
Collaboration, Drimmel, R., Romero-Gomez, M., Chemin, L., Ramos,
P., Poggio, C. E., Ripepi, V., Andrae, R., Khanna, S.,
Balbinot, E., & Helmi, A. (2023).
Gaia Data Release 3: Mapping the asymmetric disc of the Milky
Way. Astronomy & Astrophysics,
674, Article A37. https://doi.org/10.1051/0004-6361/202243797
Gaia
Collaboration, De Ridder, J., Ripepi, V., Aerts, C., Palaversa, L.,
Eyer, L., Holl, B., Audard, M., Balbinot, E.,
Helmi, A., & Khanna, S. (2023). Gaia Data Release
3: Pulsations in main sequence OBAF-type stars.
Astronomy & Astrophysics, 674,
Article A36. https://doi.org/10.1051/0004-6361/202243767
Gaia
Collaboration, Schultheis, M., Zhao, H., Zwitter, T., Marshall, D.
J., Drimmel, R., Frémat, Y., Bailer-Jones, C. A. L.,
Balbinot, E., Helmi, A., & Khanna, S.
(2023). Gaia Data Release 3: Exploring and mapping the
diffuse interstellar band at 862 nm. Astronomy
& Astrophysics, 674, Article A40. https://doi.org/10.1051/0004-6361/202243283
Gaia
Collaboration, Vallenari, A., Brown, A. G. A., Prusti, T., de
Bruijne, J. H. J., Arenou, F., Babusiaux, C., Biermann, M.,
Balbinot, E., Helmi, A., & Khanna, S.
(2023). Gaia Data Release 3: Summary of the content and
survey properties. Astronomy &
Astrophysics, 674, Article A1. https://doi.org/10.1051/0004-6361/202243940
Gaia
Collaboration, Arenou, F., Babusiaux, C., Barstow, M. A., Faigler,
S., Jorissen, A., Kervella, P., Mazeh, T., Balbinot,
E., Helmi, A., & Khanna, S. (2023).
Gaia Data Release 3: Stellar multiplicity, a teaser for the
hidden treasure. Astronomy &
Astrophysics, 674, Article A34. https://doi.org/10.1051/0004-6361/202243782
Gaia
Collaboration, Montegriffo, P., Bellazzini, M., Angeli, F., Andrae,
R., Barstow, M. A., Bossini, D., Bragaglia, A., Balbinot,
E., Helmi, A., & Khanna, S. (2023).
Gaia Data Release 3: The Galaxy in your preferred colours:
Synthetic photometry from Gaia low-resolution spectra.
Astronomy & Astrophysics, 674,
Article A33. https://doi.org/10.1051/0004-6361/202243709
Dodd,
E., Callingham, T. M., Helmi,
A., Matsuno, T., Ruiz-Lara,
T., Balbinot, E., & Lövdal,
S. (2023). Gaia DR3 view of dynamical substructure in
the stellar halo near the Sun. Astronomy &
Astrophysics, 670, Article L2. https://doi.org/10.1051/0004-6361/202244546
Gaia
Collaboration, David, P., Mignard, F., Hestroffer, D., Tanga, P.,
Spoto, F., Berthier, J., Pauwels, T., Helmi, A., &
Khanna, S. (2023). Gaia Focused Product Release: Asteroid
orbital solution. Properties and assessment.
Astronomy & Astrophysics, 680,
Article A37. https://doi.org/10.1051/0004-6361/202347270
Gaia
Collaboration, Weingrill, K., Mints, A., Castaneda, J.,
Kostrzewa-Rutkowska, Z., Davidson, M., De Angeli, F., Hernandez,
J., Helmi, A., & Khanna, S. (2023). Gaia
Focused Product Release: Sources from Service Interface Function
image analysis. Half a million new sources in omega
Centauri. Astronomy &
Astrophysics, 680, Article A35. https://doi.org/10.1051/0004-6361/202347203
Gaia
Collaboration, Trabucchi, M., Mowlavi, N., Lebzelter, T.,
Lecoeur-Taibi, I., Audard, M., Eyer, L., Garcia-Lario, P.,
Helmi, A., & Khanna, S. (2023). Gaia Focused
Product Release: Radial velocity time series of long-period
variables. Astronomy &
Astrophysics, 680, Article A36. https://doi.org/10.1051/0004-6361/202347287
Gaia
Collaboration, Schultheis, M., Zhao, H., Zwitter, T., Bailer-Jones,
C. A. L., Carballo, R., Sordo, R., Drimmel, R., Helmi,
A., & Khanna, S. (2023). Gaia Focused Product
Release: Spatial distribution of two diffuse interstellar
bands. Astronomy & Astrophysics,
680, Article A38. https://doi.org/10.1051/0004-6361/202347103
Viswanathan,
A., Starkenburg, E., Koppelman, H.
H., Helmi, A., Balbinot, E.,
& Esselink, A. F. (2023). Hidden deep in the halo:
selection of a reduced proper motion halo catalogue and mining
retrograde streams in the velocity space. Monthly
Notices of the Royal Astronomical Society,
521(2), 2087-2102. https://doi.org/10.1093/mnras/stad380
2022
Borre,
C. C., Aguirre Børsen-Koch, V., Helmi, A.,
Koppelman, H. H., Nielsen, M. B., Rørsted, J. L.,
Stello, D., Stokholm, A., Winther, M. L., Davies, G. R., Hon, M.,
Kruijssen, J. M. D., Laporte, C. F. P., Reyes, C., & Yu, J.
(2022). Age determination of galaxy merger remnant stars
using asteroseismology. Monthly Notices of the
Royal Astronomical Society, 514(2), 2527-2544.
https://doi.org/10.1093/mnras/stac1498
Reino,
S., Rossi, E. M., Sanderson, R. E., Sellentin, E., Helmi,
A., Koppelman, H. H., & Sharma, S. (2022).
Erratum: Galactic potential constraints from clustering in
action space of combined stellar stream data.
Monthly Notices of the Royal Astronomical
Society, 512, 4455-4463. https://doi.org/10.1093/mnras/stac694
Gaia
Collaboration, Klioner, S. A., Lindegren, L., Mignard, F.,
Hernández, J., Ramos-Lerate, M., Bastian, U., Biermann, M.,
Bombrun, A., de Torres, A., Gerlach, E., Geyer, R., Hilger, T.,
Hobbs, D., Lammers, U. L., McMillan, P. J., Steidelmüller, H.,
Teyssier, D., Raiteri, C. M., ... Zhao, H. (2022). Gaia Early
Data Release 3. The celestial reference frame (Gaia-CRF3).
Astronomy & Astrophysics, 667,
Article A148. https://doi.org/10.1051/0004-6361/202243483
Matsuno,
T., Koppelman, H. H., Helmi, A.,
Aoki, W., Ishigaki, M. N., Suda, T., Yuan, Z., & Hattori, K.
(2022). High-precision chemical abundances of Galactic
building blocks: The distinct chemical abundance sequence of
Sequoia. Astronomy & Astrophysics,
661, Article A103. https://doi.org/10.1051/0004-6361/202142752
Matsuno,
T., Dodd, E., Koppelman, H.
H., Helmi, A., Ishigaki, M. N., Aoki, W., Zhao,
J., Yuan, Z., & Hattori, K. (2022). High-precision
chemical abundances of Galactic building blocks: II. Revisiting the
chemical distinctness of the Helmi streams.
Astronomy & Astrophysics, 665,
Article A46. https://doi.org/10.1051/0004-6361/202243609
Lövdal,
S. S., Ruiz-Lara, T., Koppelman, H.
H., Matsuno, T., Dodd, E.,
& Helmi, A. (2022). Substructure in the stellar
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