Results 101 to 110 of about 426,951 (145)

Mapping the Milky Way with Gaia BP/RP Spectra. III. The First Medium-resolution Follow-up Spectroscopy of Metal-poor Stars

The Astronomical Journal
The Gaia BP/RP spectra provide an excellent opportunity to search for extremely metal-poor (EMP; [M/H] ≤ –3.0) stars. In this study, we assess the potential of our Gaia BP/RP-based candidate catalog, vetting newly identified EMP candidates with higher ...
Xianhao Ye, David S. Aguado, Carlos Allende Prieto, Wenbo Wu, Jingkun Zhao, Jonay I. González Hernández, Rafael Rebolo, Gang Zhao, Yuqin Chen, Shuai Liu, Yaqian Wu   +10 more
doaj   +1 more source

Not-so-heavy Metal(s): Chemical Abundances in the Ultrafaint Dwarf Galaxies Eridanus IV and Centaurus I

The Astrophysical Journal
We present detailed chemical abundances of the brightest star in each of the ultrafaint dwarf galaxies Eridanus IV and Centaurus I using high-resolution Magellan/MIKE spectroscopy.
Mairéad E. Heiger, Alexander P. Ji, Ting S. Li, Joshua D. Simon, Guilherme Limberg, Julio A. Carballo-Bello, William Cerny, Astha Chaturvedi, Anirudh Chiti, Yumi Choi, Denija Crnojević, Clara E. Martínez-Vázquez, Gustavo E. Medina, Burçin Mutlu-Pakdil, Mahdieh Navabi, Noelia E. D. Noël, Andrew B. Pace, Vinicius M. Placco, Alexander H. Riley, Joanna D. Sakowska, Guy S. Stringfellow, (DELVE Collaboration)   +21 more
doaj   +1 more source

Measuring neutron capture cross sections of radioactive nuclei: From activations at the FZK Van de Graaff to direct neutron captures in inverse kinematics with a storage ring at TRIUMF. [PDF]

Eur Phys J A Hadron Nucl, 2023
Dillmann I, Kester O, Baartman R, Chen A, Junginger T, Herwig F, Kaltchev D, Lennarz A, Planche T, Ruiz C, Vassh N.   +10 more
europepmc   +1 more source

The i-process and CEMP-r/s stars

, 2015
8 pages, 4 figures, accepted for publication in Proceedings of Science of the conference XIII Nuclei in the Cosmos, 7-11 July, 2014, Debrecen ...
Dardelet, L., Ritter, C., Prado, P., Heringer, E., Higgs, C., Sandalski, S., Jones, S., Denissenkov, P., Venn, K., Bertolli, M., Pignatari, M., Woodward, P., Herwig, F.   +12 more
openaire   +2 more sources

Chemical Diversity on Small Scales: Abundance Analysis of the Tucana V Ultrafaint Dwarf Galaxy

The Astrophysical Journal
The growing number of Milky Way satellites detected in recent years has introduced a new focus for stellar abundance analysis. Abundances of stars in satellites have been used to probe the nature of these systems and their chemical evolution.
Terese T. Hansen, Joshua D. Simon, Ting S. Li, Domani Sharkey, Alexander P. Ji, Ian B. Thompson, Henrique M. Reggiani, Jhon Yana Galarza   +7 more
doaj   +1 more source

Fluorine abundances in CEMP stars at the lowest metallicity: hints on the nature of the first stars

Monthly Notices of the Royal Astronomical Society
ABSTRACT In the last decade, the available measurements of fluorine abundance have increased significantly, providing additional information on the chemical evolution of our Galaxy and details on complex stellar nucleosynthesis processes.
Aldo Mura-Guzmán, David Yong, Chiaki Kobayashi, Nozomu Tominaga, Madeleine McKenzie, Ricardo Salinas, Gregory Mace, Hwihyun Kim, Daniel B Zucker   +8 more
openaire   +2 more sources

Four-hundred Very Metal-poor Stars Studied with LAMOST and Subaru. III. Dynamically Tagged Groups and Chemodynamical Properties

The Astrophysical Journal
Very metal-poor (VMP) stars record the signatures of early accreted galaxies, making them essential tools for unraveling the early stages of Galaxy formation.
Ruizhi Zhang, Tadafumi Matsuno, Haining Li, Wako Aoki, Xiang-Xiang Xue, Takuma Suda, Gang Zhao, Yuqin Chen, Miho N. Ishigaki, Jianrong Shi, Qianfan Xing, Jingkun Zhao   +11 more
doaj   +1 more source

Stellar nucleosynthesis in the era of large surveys: S-process-polluted binaries in GALAH DR4

Astronomy & Astrophysics
Context. Binary interactions during the asymptotic giant branch phase can lead to the formation of chemically peculiar stars such as Ba-, CH-, and CEMP-s stars with overabundances of s-process elements as well as carbon. Only a few hundred of these stars
Escorza A., Vitali S., Godoy-Rivera D., Shetye S., Van Winckel H., Bustos G., Goriely S., Siess L., Abdul-Masih M., Masseron T., García-Hernández D. A., Ardern-Arentsen A., Jofré P., Van Eck S.   +13 more
doaj   +1 more source

Facilitating population genomics of non-model organisms through optimized experimental design for reduced representation sequencing. [PDF]

BMC Genomics, 2021
Christiansen H, Heindler FM, Hellemans B, Jossart Q, Pasotti F, Robert H, Verheye M, Danis B, Kochzius M, Leliaert F, Moreau C, Patel T, Van de Putte AP, Vanreusel A, Volckaert FAM, Schön I.   +15 more
europepmc   +1 more source

An elemental assay of very, extremely, and ultra-metal-poor stars [PDF]

, 2018
We present a high-resolution elemental-abundance analysis for a sample of 23 very metal-poor ([Fe/H] 0. The stars with [C/N] < 0 suggest a larger degree of mixing; the few CEMP-no stars that exhibit this signature are only found at [Fe/H] < −3.4, a ...
Bessell, Michael, Placco, V. M., Norris, John, Frebel, Anna, Asplund, Martin, Yong, David, Hansen, Terese, Hansen, C. J., Christlieb, N, Beers, Timothy C, García Pérez, A. E.   +10 more
core   +1 more source