Results 1 to 10 of about 84,685 (303)

High-precision chemical abundances of Galactic building blocks. The distinct chemical abundance sequence of Sequoia

Astronomy & Astrophysics, 2022
Context: Sequoia is a retrograde kinematic substructure in the nearby Galactic halo, whose properties are a matter of debate. For example, previous studies do not necessarily agree on the chemical abundances of Sequoia stars, which are important for ...
Zhao, Jingkun, Wako Aoki, Yuan, Zhen, Suda, Takuma, Jingkun Zhao, Tadafumi Matsuno, Emma Dodd, Helmi, Amina, Takuma Suda, Matsuno, Tadafumi, Helmer H. Koppelman, Aoki, Wako, Hattori, Kohei, Zhen Yuan, Koppelman, Helmer H., Dodd, Emma; id_orcid, Ishigaki, Miho N., Dodd, Emma, Kohei Hattori, Miho N. Ishigaki, Amina Helmi   +20 more
core   +3 more sources

CHEMICAL ABUNDANCES IN BINARIES WITH TWIN COMPONENTS

Odessa Astronomical Publications, 2017
Procedure and some preliminary results of abundances determination in binaries with twin components from solar neighborhood are discussed. Numerical analysis were carried out by fits of synthetical spectra and COG to high resolution (R=50000) observed ...
Yu. Lyubchik, E. Martin, G. Basri, Ya. Pavlenko   +3 more
doaj   +1 more source

Differential abundances of open clusters and their tidal tails : Chemical tagging and chemical homogeneity

, 2020
Context: Well studied open clusters (OCs) of the solar neighborhood are frequently used as reference objects to test galactic and stellar theories. For that purpose, their chemical composition needs to be known with a high level of confidence. It is also
Heiter, Ulrike, P. Jofré, U. Heiter, Soubiran, C, L. Casamiquela, Jofré, P, Casamiquela, L., Blanco-Cuaresma, S, Soubiran, C., Blanco-Cuaresma, S., Tucci Maia, M., Jofre, P., S. Blanco-Cuaresma, Heiter, U, Y. Tarricq, Casamiquela, L, C. Soubiran, Tarricq, Y., Tarricq, Y, Tucci, M, M. Tucci Maia   +20 more
core   +1 more source

The Missing Link of Sulfur Chemistry in TMC-1: The Detection of c-C3H2S from the GOTHAM Survey

The Astrophysical Journal
We present the spectroscopic characterization of cyclopropenethione in the laboratory and detect it in space using the Green Bank Telescope Observations of TMC-1: Hunting Aromatic Molecules survey.
Anthony J. Remijan, P. Bryan Changala, Ci Xue, Elsa Q. H. Yuan, Miya Duffy, Haley N. Scolati, Christopher N. Shingledecker, Thomas H. Speak, Ilsa R. Cooke, Ryan Loomis, Andrew M. Burkhardt, Zachary T. P. Fried, Gabi Wenzel, Andrew Lipnicky, Michael C. McCarthy, Brett A. McGuire   +15 more
doaj   +1 more source

Screening Earth Analog Exoplanets on the Basis of a Predicted Nitrogen over Phosphorus Ratio

The Astrophysical Journal, 2023
Since the first discovery in 1995, data for over 5300 exoplanets have been documented in the NASA archive, revealing a vast diversity. Identifying life-enabling analogs of the Earth among this rapidly expanding catalog is of major interest. The stability
Hervé Toulhoat
doaj   +1 more source

Detailed Chemical Abundance Analysis of the Brightest Stars in the Turranburra and Willka Yaku Stellar Streams

The Astrophysical Journal
We present a detailed chemical abundance analysis of the three brightest known stars from each of the Turranburra and Willka Yaku stellar streams using high-resolution Magellan/Magellan Inamori Kyocera Echelle spectra. Abundances for 27 elements, ranging
K. B. Webber, T. T. Hansen, J. L. Marshall, Alexander P. Ji, Ting S. Li, Gary S. Da Costa, Lara R. Cullinane, Denis Erkal, Sergey E. Koposov, Kyler Kuehn, Geraint F. Lewis, Dougal Mackey, Sarah L. Martell, Andrew B. Pace, Nora Shipp, Jeffrey D. Simpson, Zhen Wan, Daniel B. Zucker, Victor A. Alvarado, Joss Bland-Hawthorn, Guilherme Limberg, Gustavo E. Medina, Sam A. Usman   +22 more
doaj   +1 more source

The ¹⁷O/¹⁸O Ratio of Post-AGB Sources: Canonical and Non-Canonical Populations

Galaxies
Stellar evolution models serve as tools to derive stellar parameters from elemental and isotopic abundance ratios. For low-to-intermediate mass evolved stars, C/O, 12C/13C, and 17O/18O ratios are proxies of the initial mass, a largely unknown parameter ...
Javier Alcolea, Elisa Masa, Theo Khouri, Miguel Santander-García, Iván Gallardo Cava, Hans Olofsson, Carmen Sánchez Contreras, Valentín Bujarrabal, Wouter H. T. Vlemmings, Daniel Tafoya   +9 more
doaj   +1 more source

Chemical abundances across the first kpc of the LMC

, 2019
The chemical evolution of the Large Magellanic Cloud (LMC) yields information on many different aspects of low-mass disc galaxy evolution, and the evolution of an interacting system.
Van der Swaelmen, Mathieu (8343477), Van der Swaelmen, Mathieu   +1 more
core   +1 more source

A Systematic NLTE Study of Very Metal-poor Stars with Metallicity down to −4.3 dex. VI. Light Neutron-capture Elements and the Sr–Na Correlation as a Signature of Spinstar Nucleosynthesis in the Early Galaxy

The Astrophysical Journal
We present a non–local thermodynamic equilibrium (NLTE) abundance analysis of the light neutron-capture elements Sr, Y, and Zr in a sample of 103 very metal-poor stars spanning −4.3 ≲ [Fe/H] ≲ −1.7, based on high-resolution Subaru/HDS spectra and ...
Sofya Alexeeva, Hongliang Yan, Gang Zhao, Jianrong Shi, Haining Li, Shuai Liu, Zeming Zhou, Junbo Zhang, Jingkun Zhao, Yaqian Wu, Yuqin Chen, Huiling Chen, Huawei Zhang, Wako Aoki   +13 more
doaj   +1 more source

Optical Spectroscopy and Photoionization Model of Planetary Nebula NGC 6572

Journal of Mathematical and Fundamental Sciences
We investigated NGC 6572 through optical spectroscopy to determine its kinematical and chemical properties. Two intermediate dispersion spectra (R~5000) centered around Hα and Hβ were used to derive the nebular expansion velocity from emission lines ...
Muhammad Fajrin, Hakim Luthfi Malasan, Evan Irawan Akbar   +2 more
doaj   +1 more source