Results 11 to 20 of about 197,788 (330)

Galaxy chemical evolution models: The role of molecular gas formation [PDF]

, 2017
In our classical grid of multiphase chemical evolution models, star formation in the disc occurs in two steps: first, molecular gas forms, and then stars are created by cloud-cloud collisions or interactions of massive stars with the surrounding ...
Ascasibar, Yago, Díaz, Angeles I., Díaz, Ángeles I., Gibson, Brad K., Mollá, Mercedes   +4 more
core   +4 more sources

The Chemical Evolution of the Galaxy: the two-infall model [PDF]

, 1996
In this paper we present a new chemical evolution model for the Galaxy which assumes two main infall episodes for the formation of halo-thick disk and thin disk, respectively. We do not try to take into account explicitly the evolution of the halo but we
C., Chiappini, F., Gratton, Matteucci, R.   +5 more
core   +4 more sources

An inefficient dwarf: Chemical abundances and the evolution of the Ursa Minor dwarf spheroidal galaxy [PDF]

, 2015
We present detailed chemical element abundance ratios of 17 elements in three metal poor stars in the Ursa Minor dwarf spheroidal galaxy, which we combine with extant data from the literature to assess the predictions of a novel suite of galaxy chemical ...
Cescutti, Gabriele, Feltzing, Sofia, Kleyna, Jan, Koch, Andreas, Ural, Ugur, Wilkinson, Mark I.   +5 more
core   +2 more sources

The Chemical Evolution of the Ursa Minor Dwarf Spheroidal Galaxy [PDF]

, 2010
We present an abundance analysis based on high resolution spectra of 10 stars selected to span the full range in metallicity in the Ursa Minor dwarf spheroidal galaxy.
Abazajian, Aoki, Asplund, Baumüller, Baumüller, Bellazzini, Carpenter, Cohen, Cohen, Cohen, Cohen, Cohen, Cohen, Cutri, Dotter, Frebel, Fulbright, Fulbright, Fulbright, Gallagher, Geisler, Grebel, Helmi, Houdashelt, Ishigaki, Ivans, Johnson, Judith G. Cohen, Kirby, Kirby, Klypin, Kobayashi, Koch, Koch, Kurucz, Lai, Letarte, Limongi, Matteucci, Melendez, Mighell, Nissen, Nissen, Nissen, Norris, Ohkubo, Orban, Palma, Peñarrubia, Piatek, Prantzos, Prochaska, Qian, Roederer, Sadakane, Salvadori, Schlegel, Shetrone, Shetrone, Shetrone, Shortridge, Simmerer, Simon, Skrutskie, Smith, Sneden, Stephens, Tolstoy, Travaglio, Walker, Wenjin Huang, Winnick, York, Young   +73 more
core   +5 more sources

Assessing stellar yields in Galaxy chemical evolution: Observational stellar abundance patterns [PDF]

Monthly notices of the Royal Astronomical Society, 2023
One-zone Galactic Chemical Evolution (GCE) models have provided useful insights on a great wealth of average abundance patterns in many environments, especially for the Milky Way and its satellites.
Jinning Liang, E. Gjergo, Xilong Fan
semanticscholar   +1 more source

APOGEE DR16: A multi-zone chemical evolution model for the Galactic disc based on MCMC methods [PDF]

Astronomy & Astrophysics, 2021
Context. The analysis of the latest release of the Apache Point Observatory Galactic Evolution Experiment project (APOGEE DR16) data suggests the existence of a clear distinction between two sequences of disc stars at different Galactocentric distances ...
E. Spitoni, K. Verma, V. S. Aguirre, F. Vincenzo, F. Matteucci, B. Vaičekauskaitė, M. Palla, V. Grisoni, F. Calura   +8 more
semanticscholar   +1 more source

The chemical evolution of the dwarf spheroidal galaxy Sextans [PDF]

Astronomy & Astrophysics, 2019
We present our analysis of the FLAMES dataset targeting the central 25′ region of the Sextans dwarf spheroidal galaxy (dSph). This dataset is the third major part of the high-resolution spectroscopic section of the ESO large program 171.B-0588(A ...
R. Theler, P. Jablonka, R. Lucchesi, C. Lardo, P. North, M. Irwin, G. Battaglia, V. Hill, E. Tolstoy, K. Venn, A. Helmi, A. Kaufer, F. Primas, M. Shetrone   +13 more
semanticscholar   +1 more source

EMPRESS. XI. SDSS and JWST Search for Local and z ∼4–5 Extremely Metal-poor Galaxies (EMPGs): Clustering and Chemical Properties of Local EMPGs

The Astrophysical Journal, 2023
We search for local extremely metal-poor galaxies (EMPGs), selecting photometric candidates by broadband color excess and machine-learning techniques with the SDSS photometric data.
Moka Nishigaki, Masami Ouchi, Kimihiko Nakajima, Yoshiaki Ono, Michael Rauch, Yuki Isobe, Yuichi Harikane, Kanako Narita, Fakhri Zahedy, Yi Xu, Hidenobu Yajima, Hajime Fukushima, Yutaka Hirai, Ji Hoon Kim, Shigeki Inoue, Haruka Kusakabe, Chien-Hsiu Lee, Tohru Nagao, Masato Onodera   +18 more
doaj   +1 more source

Nitrogen isotopes in the interstellar medium: A chemical journey across the Galaxy [PDF]

EPJ Web of Conferences, 2022
One of the most important tools to investigate the chemical history of our Galaxy and our own Solar System is to measure the isotopic fractionation of chemical elements. This is the process that distributes the less abundant stable isotopes of an element
Colzi Laura, Fontani Francesco, Rivilla Víctor M., Caselli Paola   +3 more
doaj   +1 more source

Chemical evolution of Seyfert galaxies [PDF]

Proceedings of the International Astronomical Union, 2007
AbstractWe computed the chemical evolution of Seyfert galaxies, residing in spiral bulges, based on an updated model for the Milky Way bulge with updated calculations of the Galactic potential and of the feedback from the central supermassive black hole (BH) in a spherical approximation. We followed the evolution of bulges of masses 2 × 109 − 1011M⊙ by
S. K. Ballero, F. Matteucci, CIOTTI, LUCA   +2 more
openaire   +5 more sources