The Astrophysical Journal (Jan 2023)
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
Affiliations
- K. B. Webber
- ORCiD
- Mitchell Institute for Fundamental Physics and Astronomy and Department of Physics and Astronomy, Texas A&M University , College Station, TX 77843-4242, USA ; [email protected]
- T. T. Hansen
- ORCiD
- Department of Astronomy, Stockholm University , AlbaNova University Center, SE-106 91 Stockholm, Sweden
- J. L. Marshall
- Mitchell Institute for Fundamental Physics and Astronomy and Department of Physics and Astronomy, Texas A&M University , College Station, TX 77843-4242, USA ; [email protected]
- J. D. Simon
- ORCiD
- Observatories of the Carnegie Institution for Science , 813 Santa Barbara St., Pasadena, CA 91101, USA
- A. B. Pace
- ORCiD
- McWilliams Center for Cosmology, Carnegie Mellon University , 5000 Forbes Ave., Pittsburgh, PA 15213, USA
- B. Mutlu-Pakdil
- ORCiD
- Department of Physics and Astronomy, Dartmouth College , Hanover, NH 03755, USA
- A. Drlica-Wagner
- ORCiD
- Fermi National Accelerator Laboratory , P.O. Box 500, Batavia, IL 60510, USA; Kavli Institute for Cosmological Physics, University of Chicago , Chicago, IL 60637, USA; Department of Astronomy and Astrophysics, University of Chicago , Chicago, IL 60637, USA
- C. E. Martínez-Vázquez
- ORCiD
- Gemini Observatory, NSF's NOIRLab , 670 N. A’ohoku Pl., Hilo, HI 96720, USA; Cerro Tololo Inter-American Observatory, NSF's NOIRLab , Casilla 603, La Serena, Chile
- M. Aguena
- ORCiD
- Laboratório Interinstitucional de e-Astronomia—LIneA , Rua Gal. José Cristino 77, Rio de Janeiro, RJ—20921-400, Brazil
- S. S. Allam
- ORCiD
- Fermi National Accelerator Laboratory , P.O. Box 500, Batavia, IL 60510, USA
- O. Alves
- ORCiD
- Department of Physics, University of Michigan , Ann Arbor, MI:48109, USA
- E. Bertin
- ORCiD
- CNRS, UMR 7095, Institut d’Astrophysique de Paris , F-75014, Paris, France; Sorbonne Universités, UPMC Univ Paris 06 , UMR 7095, Institut d’Astrophysique de Paris, F-75014, Paris, France
- D. Brooks
- ORCiD
- Department of Physics & Astronomy, University College London , Gower St., London, WC1E 6BT, UK
- A. Carnero Rosell
- ORCiD
- Laboratório Interinstitucional de e-Astronomia—LIneA , Rua Gal. José Cristino 77, Rio de Janeiro, RJ—20921-400, Brazil; Instituto de Astrofisica de Canarias , E-38205 La Laguna, Tenerife, Spain; Universidad de La Laguna , Dpto. Astrofísica, E-38206 La Laguna, Tenerife, Spain
- J. Carretero
- ORCiD
- Institut de Física d’Altes Energies (IFAE) , The Barcelona Institute of Science and Technology, Campus UAB, E-08193 Bellaterra Barcelona, Spain
- L. N. da Costa
- ORCiD
- Laboratório Interinstitucional de e-Astronomia—LIneA , Rua Gal. José Cristino 77, Rio de Janeiro, RJ—20921-400, Brazil
- J. De Vicente
- ORCiD
- Centro de Investigaciones Energéticas , Medioambientales y Tecnológicas (CIEMAT), Madrid, Spain
- P. Doel
- Department of Physics & Astronomy, University College London , Gower St., London, WC1E 6BT, UK
- I. Ferrero
- ORCiD
- Institute of Theoretical Astrophysics, University of Oslo.P.O. Box 1029 Blindern , NO-0315 Oslo, Norway
- D. Friedel
- ORCiD
- Center for Astrophysical Surveys , National Center for Supercomputing Applications, 1205 West Clark St., Urbana, IL 61801, USA
- J. Frieman
- ORCiD
- Fermi National Accelerator Laboratory , P.O. Box 500, Batavia, IL 60510, USA; Kavli Institute for Cosmological Physics, University of Chicago , Chicago, IL 60637, USA
- J. García-Bellido
- ORCiD
- Instituto de Fisica Teorica UAM/CSIC, Universidad Autonoma de Madrid , E-28049 Madrid, Spain
- G. Giannini
- ORCiD
- Institut de Física d’Altes Energies (IFAE) , The Barcelona Institute of Science and Technology, Campus UAB, E-08193 Bellaterra Barcelona, Spain
- D. Gruen
- ORCiD
- University Observatory, Faculty of Physics, Ludwig-Maximilians-Universität , Scheinerstr. 1, D-81679 Munich, Germany
- R. A. Gruendl
- ORCiD
- Center for Astrophysical Surveys , National Center for Supercomputing Applications, 1205 West Clark St., Urbana, IL 61801, USA; Department of Astronomy, University of Illinois at Urbana-Champaign , 1002 W. Green St., Urbana, IL 61801, USA
- S. R. Hinton
- ORCiD
- School of Mathematics and Physics, University of Queensland , Brisbane, QLD 4072, Australia
- D. L. Hollowood
- ORCiD
- Santa Cruz Institute for Particle Physics , Santa Cruz, CA 95064, USA
- K. Honscheid
- ORCiD
- Center for Cosmology and Astro-Particle Physics, The Ohio State University , Columbus, OH 43210, USA; Department of Physics, The Ohio State University , Columbus, OH 43210, USA
- K. Kuehn
- ORCiD
- Australian Astronomical Optics, Macquarie University , North Ryde, NSW 2113, Australia; Lowell Observatory , 1400 Mars Hill Rd., Flagstaff, AZ 86001, USA
- J. Mena-Fernández
- ORCiD
- Centro de Investigaciones Energéticas , Medioambientales y Tecnológicas (CIEMAT), Madrid, Spain
- F. Menanteau
- ORCiD
- Center for Astrophysical Surveys , National Center for Supercomputing Applications, 1205 West Clark St., Urbana, IL 61801, USA; Department of Astronomy, University of Illinois at Urbana-Champaign , 1002 W. Green St., Urbana, IL 61801, USA
- R. Miquel
- ORCiD
- Institut de Física d’Altes Energies (IFAE) , The Barcelona Institute of Science and Technology, Campus UAB, E-08193 Bellaterra Barcelona, Spain; Institució Catalana de Recerca i Estudis Avançats , E-08010 Barcelona, Spain
- R. L. C. Ogando
- ORCiD
- Observatório Nacional , Rua Gal. José Cristino 77, Rio de Janeiro, RJ—20921-400, Brazil
- M. E. S. Pereira
- ORCiD
- Hamburger Sternwarte, Universität Hamburg , Gojenbergsweg 112, D-21029 Hamburg, Germany
- A. Pieres
- ORCiD
- Laboratório Interinstitucional de e-Astronomia—LIneA , Rua Gal. José Cristino 77, Rio de Janeiro, RJ—20921-400, Brazil; Observatório Nacional , Rua Gal. José Cristino 77, Rio de Janeiro, RJ—20921-400, Brazil
- A. A. Plazas Malagón
- ORCiD
- Kavli Institute for Particle Astrophysics & Cosmology, P.O. Box 2450, Stanford University , Stanford, CA 94305, USA; SLAC National Accelerator Laboratory , Menlo Park, CA 94025, USA
- E. Sanchez
- ORCiD
- Centro de Investigaciones Energéticas , Medioambientales y Tecnológicas (CIEMAT), Madrid, Spain
- B. Santiago
- Laboratório Interinstitucional de e-Astronomia—LIneA , Rua Gal. José Cristino 77, Rio de Janeiro, RJ—20921-400, Brazil; Instituto de Física , UFRGS, Caixa Postal 15051, Porto Alegre, RS—91501-970, Brazil
- J. Allyn Smith
- ORCiD
- Austin Peay State University , Dept. Physics, Engineering and Astronomy, P.O. Box 4608 Clarksville, TN 37044, USA
- M. Smith
- ORCiD
- School of Physics and Astronomy, University of Southampton , Southampton, SO17 1BJ, UK
- E. Suchyta
- ORCiD
- Computer Science and Mathematics Division , Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA
- G. Tarle
- ORCiD
- Department of Physics, University of Michigan , Ann Arbor, MI:48109, USA
- C. To
- ORCiD
- Center for Cosmology and Astro-Particle Physics, The Ohio State University , Columbus, OH 43210, USA
- N. Weaverdyck
- ORCiD
- Department of Physics, University of Michigan , Ann Arbor, MI:48109, USA; Lawrence Berkeley National Laboratory , 1 Cyclotron Rd., Berkeley, CA 94720, USA
- B. Yanny
- ORCiD
- Fermi National Accelerator Laboratory , P.O. Box 500, Batavia, IL 60510, USA
- DOI
- https://doi.org/10.3847/1538-4357/ad0385
- Journal volume & issue
-
Vol. 959,
no. 2
p. 141
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.
Keywords
