Results 61 to 70 of about 210,874 (237)

Core to Cosmic Edge: SIMBA-C’s New Take on Abundance Profiles in the Intragroup Medium at z = 0

Universe
We employ the simba-c cosmological simulation to study the impact of its upgraded chemical enrichment model (Chem5) on the distribution of metals in the intragroup medium (IGrM).
Aviv Padawer-Blatt, Zhiwei Shao, Renier T. Hough, Douglas Rennehan, Ruxin Barré, Vida Saeedzadeh, Arif Babul, Romeel Davé, Chiaki Kobayashi, Weiguang Cui, François Mernier, Ghassem Gozaliasl   +11 more
doaj   +1 more source

Chemical Cartography with APOGEE: Two-process Parameters and Residual Abundances for 288,789 Stars from Data Release 17

The Astrophysical Journal
Stellar abundance measurements are subject to systematic errors that induce extra scatter and artificial correlations in elemental abundance patterns. We derive empirical calibration offsets to remove systematic trends with surface gravity $\mathrm{log ...
Tawny Sit, David H. Weinberg, Adam Wheeler, Christian R. Hayes, Sten Hasselquist, Thomas Masseron, Jennifer Sobeck   +6 more
doaj   +1 more source

The Ca ii Lines as Tracers of Disk Structure in T Tauri Stars: The Chamaeleon I Region

The Astrophysical Journal, 2023
We present a study of the Ca ii K and IR triplet lines in a sample of classical T Tauri stars in the Chamaeleon I star-forming region. We study X-shooter spectra of the stars in the sample and find that in some of these stars the Ca ii lines are much ...
Marbely Micolta, Nuria Calvet, Thanawuth Thanathibodee, Gladis Magris C., María José Colmenares, Jesús V. Díaz, Jairo Alzate-Trujillo   +6 more
doaj   +1 more source

Two-process Model and Residual Abundance Analysis of the Milky Way Massive Satellites

The Astrophysical Journal
The “two-process model” is a promising technique for interpreting stellar chemical abundance data from large-scale surveys (e.g., the Sloan Digital Sky Survey IV/V and the Galactic Archeology with HERMES survey), enabling more quantitative empirical ...
Sten Hasselquist, Christian R. Hayes, Emily J. Griffith, David Weinberg, Tawny Sit, Rachael L. Beaton, Danny Horta   +6 more
doaj   +1 more source

Radial molecular abundances and gas cooling in starless cores

, 2012
Aims: We aim to simulate radial profiles of molecular abundances and the gas temperature in cold and heavily shielded starless cores by combining chemical and radiative transfer models.
Aikawa, Andersson, Bergeron, Bergin, Bonnor, Broderick, Caselli, Cazaux, Du, Flower, Fontani, Galli, Garrod, Garrod, Garrod, Geppert, Goldsmith, Goldsmith, Goldsmith, Goumans, Hasegawa, Hasegawa, Hily-Blant, Hollenbach, Hotzel, Juvela, Juvela, Jørgensen, Katz, Keto, Keto, Keto, Lee, Liseau, O. Sipilä, Ossenkopf, Padovani, Pagani, Schöier, Semenov, Sipilä, Sipilä, Tafalla, Taquet, Willacy, Wilson, Young   +46 more
core   +1 more source

Chemical abundances in a UV-selected sample of galaxies [PDF]

Monthly Notices of the Royal Astronomical Society, 2002
17 pages, 10 figures, and 2 tables.
Contini, Thierry, Treyer, Marie A., Sullivan, Mark, Ellis, Richard S.   +3 more
openaire   +6 more sources

Chemical abundances in M31 from HII regions

, 2012
We have obtained multi-slit spectroscopic observations from 3700A to 9200A with LRIS at the Keck I telescope for 31 HII regions in the disk of the Andromeda galaxy (M31), spanning a range in galactocentric distance from 3.9 kpc to 16.1 kpc.
A. Zurita, Alloin, Asplund, Baade, Benjamin, Bernard, Blair, Block, Bohlin, Bresolin, Bresolin, Bresolin, Bresolin, Bresolin, Bresolin, Bresolin, Bresolin, Bèland, Corbelli, Davidge, De Robertis, de Vaucouleurs, Dennefeld, Dopita, Edmunds, Edmunds, Esteban, F. Bresolin, Ferguson, Ferguson, Fesen, French, Galarza, Garnett, González-Delgado, Hammer, Hamuy, Howarth, Ibata, Izotov, Kennicutt, Kewley, Kewley, Kudritzki, Kudritzki, Kuzio de Naray, Kwitter, Liu, Lodders, López-Sánchez, Magrini, Mallery, Marcon-Uchida, McCall, McGaugh, Mesa-Delgado, Monet, Nicholls, Oke, Oke, Pagel, Pagel, Patterson, Peimbert, Peimbert, Peimbert, Pellet, Pettini, Pilkington, Pilyugin, Pilyugin, Porter, Pérez-Montero, Pérez-Montero, Renda, Rubin, Sabbadin, Seaton, Shaw, Skillman, Skrutskie, Smartt, Stasińska, Stasińska, Storey, Stupar, Tanaka, Trundle, Unwin, van Dokkum, Venn, Vila Costas, Vila Costas, Vilardell, Vílchez, Williams, Yin, Zaritsky   +97 more
core   +1 more source

Hydro-chemical study of the evolution of interstellar pre-biotic molecules during the collapse of molecular clouds

, 2012
One of the stumbling blocks for studying the evolution of interstellar molecules is the lack of adequate knowledge of the rate co-efficients of various reactions which take place in the Interstellar medium and molecular clouds.
Ankan Das, Boogert, Chakrabarti, Chakrabarti, Chakrabarti, Cuppen, Das, Fuente, Gibb, Guelin, Ioppolo, Kuan, Liton Majumdar, Sandip K. Chakrabarti, Snyder, Sonali Chakrabarti, Woon   +16 more
core   +1 more source

Rapid Chemical Enrichment by Intermittent Star Formation in GN-z11

The Astrophysical Journal Letters
We interpret the peculiar supersolar nitrogen abundance recently reported by the James Webb Space Telescope observations for GN-z11 ( z = 10.6) using our state-of-the-art chemical evolution models.
Chiaki Kobayashi, Andrea Ferrara
doaj   +1 more source

Hydrodynamical instabilities induced by atomic diffusion in A stars and their consequences

, 2016
Aims. Atomic diffusion, including the effect of radiative accelerations on individual elements, leads to important variations of the chemical composition inside the stars.
Deal, M., Richard, O., Vauclair, S.
core   +2 more sources