Results 81 to 90 of about 226,407 (198)

The metallicity gradient of M 33: chemical abundances of HII regions

, 2007
We present spectroscopic observations of a sample of 72 emission-line objects, including mainly HII regions, in the spiral galaxy M 33. Spectra were obtained with the multi-object, wide field spectrograph AF2/WYFFOS at the 4.2m WHT telescope.
A. Mampaso, Aller, Asplund, Beaulieu, Blair, Block, Block, Boulesteix, Brooks, Calzetti, Chieffi, Ciardullo, Courtes, Crockett, Davidge, Devereux, Domgorgen, Filippenko, Freedman, Galarza, Galletti, Garnett, Gordon, Henry, Henry, Herrero, Hirschi, Hodge, Holmberg, Israel, Izotov, Izotov, J. M. Vílchez, Kennicutt, Kim, Kniazev, Kwitter, L. Magrini, Magrini, Magrini, Magrini, Mathis, McCarthy, Monteverde, Monteverde, Oke, P. Leisy, Pagel, Pilyugin, Pérez-Montero, R. L. M. Corradi, Riesgo, Rosolowsky, Rowe, Scowen, Searle, Smith, Stephens, Tiede, Tosi, Urbaneja, Venn, Viallefond, Vílchez, Vílchez, Westmeier, Willner, Wyder, Zaritsky   +68 more
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Molybdenum Abundances in MINCE Stars

Galaxies
Molybdenum (Mo, Z = 42) is a neutron-capture element with seven stable isotopes that can be produced by different processes. Previous studies have shown a large scatter in molybdenum abundances for metal-poor ([Fe/H] < −1) stars, indicating that multiple
Linda Lombardo, Francesca Lucertini
doaj   +1 more source

About the chemical composition of delta Scuti - the prototype of the class of pulsating variables

, 2004
We present chemical abundances in the photosphere of $\delta$ Scuti -- the prototype of the class of pulsating variables -- determined from the analysis of a spectrum obtained at Terskol observatory 2 meter telescope with resolution $R=52,000$, signal to
Gopka, V., Kang, F., Kim, C., Musaev, F., Yushchenko, A.   +4 more
core   +1 more source

Chemical abundances in the damped Lyα systems [PDF]

SPIE Proceedings, 2000
14 pages, 7 figures; a refereed review paper to appear in Carnegie Observatories Astrophysics Series, Vol. 4: Origin and Evolution of the Elements, ed. A. McWilliam & M. Rauch (Cambridge: Cambridge Univ. Press)
openaire   +2 more sources

Element Nucleosynthetic Origins from Abundance Spatial Distributions beyond the Milky Way

The Astrophysical Journal Letters
An element’s astrophysical origin should be reflected in the spatial distribution of its abundance, yielding measurably different spatial distributions for elements with different nucleosynthetic sites.
Zefeng Li, Mark R. Krumholz, Anna F. McLeod, A. Mark Swinbank, Emily Wisnioski, J. Trevor Mendel, Francesco Belfiore, Giovanni Cresci, Giacomo Venturi, Jia-Lai Kang   +9 more
doaj   +1 more source

Abundance trend with condensation temperature for stars with different Galactic birth places

, 2016
During the past decade, several studies reported a correlation between chemical abundances of stars and condensation temperature (also known as Tc trend). However, the real astrophysical nature of this correlation is still debated.
Adibekyan, V., Delgado-Mena, E., Faria, J. P., Figueira, P., Hakobyan, A. A., Harutyunyan, G., Hernandez, J. I. Gonzalez, Israelian, G., Minchev, I., Santos, N. C., Sousa, S. G., Suarez-Andres, L.   +11 more
core   +1 more source

The AMBRE Project: searching for the closest solar siblings

, 2018
Finding solar siblings, that is, stars that formed in the same cluster as the Sun, will yield information about the conditions at the Sun's birthplace.
Adibekyan, V., de Laverny, P., Delgado-Mena, E., Ferreira, A. C. S., Hakobyan, A. A., Kordopatis, G., Recio-Blanco, A., Santos, N. C., Sousa, S. G., Tsantaki, M.   +9 more
core   +1 more source

The Cocoon Nebula and its ionizing star: do stellar and nebular abundances agree?

, 2014
(Abridged) Main sequence massive stars embedded in an HII region should have the same chemical abundances as the surrounding nebular gas+dust. The Cocoon nebula, a close-by Galactic HII region ionized by a narrow line B0.5 V single star (BD+46 3474), is ...
Esteban, C., García-Rojas, J., Simón-Díaz, S.   +2 more
core   +1 more source

The High-Redshift Gas-Phase Mass–Metallicity Relation in FIRE-2

The Astrophysical Journal Letters
The unprecedented infrared spectroscopic capabilities of JWST have provided high-quality interstellar medium metallicity measurements and enabled characterization of the gas-phase mass–metallicity relation (MZR) for galaxies at z ≳ 5 for the first time ...
Andrew Marszewski, Guochao Sun, Claude-André Faucher-Giguère, Christopher C. Hayward, Robert Feldmann   +4 more
doaj   +1 more source

Chemical Abundances of new member stars in the Tucana II dwarf galaxy

, 2018
We present chemical abundance measurements for seven stars with metallicities ranging from [Fe/H] = $-$3.3 to [Fe/H] = $-$2.4 in the Tucana II ultra-faint dwarf galaxy (UFD), based on high-resolution spectra obtained with the MIKE spectrograph on the 6.5
Chiti, Anirudh, Frebel, Anna, Jerjen, Helmut, Ji, Alexander P., Kim, Dongwon, Norris, John E.   +5 more
core   +1 more source