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The authors would like to thank Dr. Maria Drout for collecting the spectra of J0117 from 2017 November and Dr. Andrew McWilliam for atomic K line data and insightful comments on K abundances in stars.

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Garcia-Bellido, JAuthor
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Chemical analysis of the brightest star of the cetus ii ultrafaint dwarf galaxy candidate

Publicated to:ASTROPHYSICAL JOURNAL. 959 (2): 141- - 2023-12-01 959(2), DOI: 10.3847/1538-4357/ad0385

Authors: Webber, KB; Marshall, JL; Hansen, TT; Simon, JD; Pace, AB; Mutlu-Pakdil, B; Drlica-Wagner, A; Allam, SS; Frieman, J; Yanny, B; Martínez-Vázquez, CE; Aguena, M; Rosell, AC; da Costa, LN; Pieres, A; Santiago, B; Alves, O; Tarle, G; Weaverdyck, N; Bertin, E; Brooks, D; Doel, P; Carretero, J; Giannini, G; Miquel, R; De Vicente, J; Mena-Fernández, J; Sanchez, E; Ferrero, I; Friedel, D; Gruendl, RA; Menanteau, F; García-Bellido, J; Gruen, D; Hinton, SR; Hollowood, DL; Honscheid, K; To, C; Kuehn, K; Ogando, RLC; Pereira, MES; Malagón, AAP; Smith, JA; Smith, M; Suchyta, E

Affiliations

Austin Peay State Univ, Dept Phys Engn & Astron, POB 4608, Clarksville, TN 37044 USA - Author
Barcelona Inst Sci & Technol, IFAE, Campus UAB, E-08193 Bellaterra, Spain - Author
Carnegie Mellon Univ, McWilliams Ctr Cosmol, 5000 Forbes Ave, Pittsburgh, PA 15213 USA - Author
CNRS, UMR 7095, Inst Astrophys Paris, F-75014 Paris, France - Author
Ctr Invest Energet Medioambientales & Tecnol CIEM, Madrid, Spain - Author
Dartmouth Coll, Dept Phys & Astron, Hanover, NH 03755 USA - Author
Fermilab Natl Accelerator Lab, POB 500, Batavia, IL 60510 USA - Author
Inst Astrofis Canarias, E-38205 Tenerife, Spain - Author
Inst Catalana Recerca & Estudis Avancats, E-08010 Barcelona, Spain - Author
Lab Interinst eAstron LIneA, Rua Gal Jose Cristino 77, BR-20921400 Rio De Janeiro, RJ, Brazil - Author
Lawrence Berkeley Natl Lab, 1 Cyclotron Rd, Berkeley, CA 94720 USA - Author
Lowell Observ, 1400 Mars Hill Rd, Flagstaff, AZ 86001 USA - Author
Ludwig Maximilians Univ Munchen, Univ Observ, Fac Phys, Scheinerstr 1, D-81679 Munich, Germany - Author
Macquarie Univ, Australian Astron Opt, N Ryde, NSW 2113, Australia - Author
Natl Ctr Supercomp Applicat, Ctr Astrophys Surveys, 1205 West Clark St, Urbana, IL 61801 USA - Author
NSFs NOIRLab, Cerro Tololo Interamer Observ, Casilla 603, La Serena, Chile - Author
NSFs NOIRLab, Gemini Observ, 670 N Aohoku Pl, Hilo, HI 96720 USA - Author
Oak Ridge Natl Lab, Comp Sci & Math Div, Oak Ridge, TN 37831 USA - Author
Observ Carnegie Inst Sci, 813 Santa Barbara St, Pasadena, CA 91101 USA - Author
Observ Nacl, Rua Gal Jose Cristino 77, BR-20921400 Rio De Janeiro, RJ, Brazil - Author
Ohio State Univ, Ctr Cosmol & Astroparticle Phys, Columbus, OH 43210 USA - Author
Ohio State Univ, Dept Phys, Columbus, OH 43210 USA - Author
Santa Cruz Inst Particle Phys, Santa Cruz, CA 95064 USA - Author
SLAC Natl Accelerator Lab, Menlo Pk, CA 94025 USA - Author
Stanford Univ, Kavli Inst Particle Astrophys & Cosmol, POB 2450, Stanford, CA 94305 USA - Author
Stockholm Univ, Dept Astron, AlbaNova Univ Ctr, SE-10691 Stockholm, Sweden - Author
Texas A&M Univ, Dept Phys & Astron, College Stn, TX 77843 USA - Author
Texas A&M Univ, Mitchell Inst Fundamental Phys & Astron, College Stn, TX 77843 USA - Author
UCL, Dept Phys & Astron, Gower St, London WC1E 6BT, England - Author
UFRGS, Inst Fis, Caixa Postal 15051, BR-91501970 Rio De Janeiro, RJ, Brazil - Author
Univ Autonoma Madrid, Inst Fis Teor UAM CSIC, E-28049 Madrid, Spain - Author
Univ Chicago, Dept Astron & Astrophys, Chicago, IL 60637 USA - Author
Univ Chicago, Kavli Inst Cosmol Phys, Chicago, IL 60637 USA - Author
Univ Hamburg, Hamburger Sternwarte, Gojenbergsweg 112, D-21029 Hamburg, Germany - Author
Univ Illinois, Dept Astron, 1002 W Green St, Urbana, IL 61801 USA - Author
Univ La Laguna, Dpto Astrofis, E-38206 Tenerife, Spain - Author
Univ Michigan, Dept Phys, Ann Arbor, MI 48109 USA - Author
Univ Oslo, Inst Theoret Astrophys, POB 1029 Blindern, NO-0315 Oslo, Norway - Author
Univ Queensland, Sch Math & Phys, Brisbane, Qld 4072, Australia - Author
Univ Southampton, Sch Phys & Astron, Southampton SO17 1BJ, Hants, England - Author
UPMC Univ Paris 06, Sorbonne Univ, UMR 7095, Inst Astrophys Paris, F-75014 Paris, France - Author
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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 alpha-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 similar to 11.2 M-circle dot. 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.

Keywords
Abundance determinationsGlobular-clusterHigh-resolution spectroscopyLog(gf) valuesMetal-poor starsMilky-way satellitesNeutron-capture elementsNon-lte analysisOscillator-strengthsProcess enhanced star

Quality index

Bibliometric impact. Analysis of the contribution and dissemination channel

The work has been published in the journal ASTROPHYSICAL JOURNAL due to its progression and the good impact it has achieved in recent years, according to the agency WoS (JCR), it has become a reference in its field. In the year of publication of the work, 2023, it was in position 15/84, thus managing to position itself as a Q1 (Primer Cuartil), in the category Astronomy & Astrophysics.

From a relative perspective, and based on the normalized impact indicator calculated from the Field Citation Ratio (FCR) of the Dimensions source, it yields a value of: 2.36, which indicates that, compared to works in the same discipline and in the same year of publication, it ranks as a work cited above average. (source consulted: Dimensions May 2025)

Specifically, and according to different indexing agencies, this work has accumulated citations as of 2025-05-01, the following number of citations:

  • WoS: 2
  • Scopus: 2
  • OpenCitations: 2
Impact and social visibility

From the perspective of influence or social adoption, and based on metrics associated with mentions and interactions provided by agencies specializing in calculating the so-called "Alternative or Social Metrics," we can highlight as of 2025-05-01:

  • The use, from an academic perspective evidenced by the Altmetric agency indicator referring to aggregations made by the personal bibliographic manager Mendeley, gives us a total of: 1.
  • The use of this contribution in bookmarks, code forks, additions to favorite lists for recurrent reading, as well as general views, indicates that someone is using the publication as a basis for their current work. This may be a notable indicator of future more formal and academic citations. This claim is supported by the result of the "Capture" indicator, which yields a total of: 1 (PlumX).

With a more dissemination-oriented intent and targeting more general audiences, we can observe other more global scores such as:

  • The Total Score from Altmetric: 0.25.
  • The number of mentions on the social network X (formerly Twitter): 1 (Altmetric).

It is essential to present evidence supporting full alignment with institutional principles and guidelines on Open Science and the Conservation and Dissemination of Intellectual Heritage. A clear example of this is:

  • The work has been submitted to a journal whose editorial policy allows open Open Access publication.
  • Assignment of a Handle/URN as an identifier within the deposit in the Institutional Repository: https://repositorio.uam.es/handle/10486/713419
Leadership analysis of institutional authors

This work has been carried out with international collaboration, specifically with researchers from: Australia; Brazil; Chile; France; Germany; Norway; Sweden; United Kingdom; United States of America.