Results 1 to 10 of about 407,067 (139)

Chemodynamically Tagged Groups of CEMP Stars in the Halo of the Milky Way. I. Untangling the Origins of CEMP-s and CEMP-no Stars

Astrophysical Journal, 2023
We construct a sample of 644 carbon-enhanced metal-poor (CEMP) stars with abundance analyses based on moderate- to high-resolution spectroscopic studies.
Joseph Zepeda, Timothy C. Beers, Vinicius M. Placco, Derek Shank, Dmitrii Gudin, Yutaka Hirai, Mohammad Mardini, Colin Pifer, Thomas Catapano, Sean Calagna   +9 more
exaly   +5 more sources

Spectroscopic Study of Ba and CEMP-s Stars: Mass Distribution of AGB Progenitors [PDF]

The Astronomical Journal, 2023
We have performed detailed high-resolution spectroscopic analysis on seven metal-poor stars (BD+75 348, BD+09 3019, HD238020, HE0319–0215, HE0507–1653, HE0930–0018, HE1023–1504) and derived their atmospheric parameters T _eff , log g , [Fe/H], and ...
Partha Pratim Goswami, Aruna Goswami
doaj   +2 more sources

GHOST Commissioning Science Results: Identifying a New Chemically Peculiar Star in Reticulum II

The Astrophysical Journal, 2023
The Gemini High-resolution Optical SpecTrograph (GHOST) is the newest high-resolution spectrograph to be developed for a large-aperture telescope, recently deployed and commissioned at the Gemini-South telescope.
Christian R. Hayes, Kim A. Venn, Fletcher Waller, Jaclyn Jensen, Alan W. McConnachie, John Pazder, Federico Sestito, André Anthony, Gabriella Baker, John Bassett, Joao Bento, Trystyn Berg, Gregory Burley, Jurek Brzeski, Scott Case, Edward Chapin, Timothy Chin, Eric Chisholm, Vladimir Churilov, Adam Densmore, Ruben Diaz, Jennifer Dunn, Michael Edgar, Tony Farrell, Veronica Firpo, Joeleff Fitzsimmons, Juan Font-Serra, Javier Fuentes, Colin Ganton, Manuel Gomez-Jimenez, Tim Hardy, David Henderson, Alexis Hill, Brian Hoff, Michael Ireland, Venu Kalari, Neal Kelly, Urs Klauser, Yuriy Kondrat, Kathleen Labrie, Sam Lambert, Lance Luvaul, Jon Lawrence, Jordan Lothrop, G. Scott Macdonald, Slavko Mali, Steve Margheim, Richard McDermid, Helen McGregor, Bryan Miller, Felipe Miranda, Rolf Muller, Jon Nielsen, Ryan Norbury, Oliver Oberdorf, Naveen Pai, Gabriel Perez, Pablo Prado, Ian Price, Carlos Quiroz, Vladimir Reshetov, Gordon Robertson, Roque Ruiz-Carmona, Ricardo Salinas, Kim M. Sebo, Andrew Sheinis, Matthew Shetrone, Keith Shortridge, Katherine Silversides, Karleyne Silva, Chris Simpson, Greg Smith, Kei Szeto, Julia Tims, Eduardo Toro, Cristian Urrutia, Sudharshan Venkatesan, Lewis Waller, Ivan Wevers, Ramunas Wierzbicki, Marc White, Peter Young, Ross Zhelem   +82 more
doaj   +1 more source

Nucleosynthesis in low-mass stars: Shedding light on the cosmic origin of heavy elements [PDF]

EPJ Web of Conferences
Low-mass, low-metallicity stars while evolving through the asymptotic giant branch (AGB) phase undergo significant nucleosynthesis producing the majority of slow (s-) and intermedite (i-) neutron capture elements.
Goswami Aruna
doaj   +1 more source

The R-Process Alliance: Chemodynamically Tagged Groups. II. An Extended Sample of Halo r-process-enhanced Stars

The Astrophysical Journal, 2023
Orbital characteristics based on Gaia Early Data Release 3 astrometric parameters are analyzed for ∼1700 r -process-enhanced (RPE; [Eu/Fe] > +0.3) metal-poor stars ([Fe/H] ≤ −0.8) compiled from the R -Process Alliance, the GALactic Archaeology with ...
Derek Shank, Timothy C. Beers, Vinicius M. Placco, Dmitrii Gudin, Thomas Catapano, Erika M. Holmbeck, Rana Ezzeddine, Ian U. Roederer, Charli M. Sakari, Anna Frebel, Terese T. Hansen   +10 more
doaj   +1 more source

Extremely Metal-Poor Asymptotic Giant Branch Stars

Universe, 2022
Little is known about the first stars, but hints on this stellar population can be derived from the peculiar chemical composition of the most metal-poor objects in the Milky Way and in resolved stellar populations of nearby galaxies.
Mario Cirillo, Luciano Piersanti, Oscar Straniero   +2 more
doaj   +1 more source

The Barium Odd Isotope Fractions in Seven Ba Stars

Universe, 2022
Based on the spectra with high resolution and a high signal-to-noise ratio, we investigate the enrichment history of the s-process element in seven barium (Ba) stars by measuring their Ba odd isotope fraction.
Fang Wen, Wenyuan Cui, Miao Tian, Xiaoxiao Zhang, Jianrong Shi, Bo Zhang   +5 more
doaj   +1 more source

Abundance of Heavy r-process Elements in CEMP-rs Stars: The Role of the i-process

The Astrophysical Journal
Carbon-enhanced metal-poor (CEMP) stars are ancient stars enriched in carbon and heavy elements. Some of these stars exhibit enhanced s -process and/or r -process elements, and hence are classified as CEMP-s, CEMP-rs, or CEMP-r.
A. M. Riyas, D. Karinkuzhi, S. Van Eck, A. Choplin, S. Goriely, L. Siess, M. V. Keerthy, A. Jorissen, T. Merle   +8 more
doaj   +1 more source

Adaptations of glucagon‐like peptide‐1 receptor agonist‐induced weight loss, drivers of weight regain and future directions of therapeutics

The Journal of Physiology, EarlyView.
Abstract figure legend During GLP‐1RA treatment reduced appetite and energy intake, delayed gastric emptying, decreased visceral fat mass and improved glycaemic control contribute to weight loss. After treatment cessation these benefits are partially or completely reversed, resulting in weight regain, accompanied by increased appetite and energy intake,
Camille E. M. Piguet, Rosie Nucci, Jacqueline L. Beaudry   +2 more
wiley   +1 more source

Carbon measurements in two ultra-faint dwarf galaxies: Grus II and Tucana IV

Astronomy & Astrophysics
The ultra-faint dwarf galaxies (UFDs) are some of the oldest and most metal-poor environments in the Local Group. In particular, they are predicted to host the first stars (only H and He) that lit up in our Universe.
Verdiani Valentina, Skúladóttir Ása, Lucchesi Romain, Mucciarelli Alessio, Massari Davide, Battaglia Giuseppina, María Arroyo-Polonio José, Tolstoy Eline, Covella Sara, Taibi Salvatore   +9 more
doaj   +1 more source