Results 11 to 20 of about 4,372,191 (364)

Evolution of chemical abundances in Seyfert galaxies [PDF]

Astronomy & Astrophysics, 2007
17 pages, 15 figures, 3 tables, accepted for publication in A& ...
Francesco Calura, S. K. Ballero, S. K. Ballero, Francesca Matteucci, Francesca Matteucci, Paolo Padovani, Luca Ciotti   +6 more
openaire   +8 more sources

Chemical abundances from the continuum [PDF]

Physica Scripta, 2008
10 pages, 5 figures, to appear in the proceedings of the conference A Stellar Journey, a symposium in celebration of Bengt Gustafsson's 65th birthday, June 23-27, 2008 ...
Allende Prieto C, Allende Prieto C, Allende Prieto C, Asplund M, Bautista M A, C Allende Prieto, Cunto W, Hubeny I Lanz T, Koesterke L, Nahar S N, Sbordone L   +10 more
openaire   +5 more sources

Chemical abundances of Planetary Nebulae in M 33 [PDF]

Astronomy & Astrophysics, 2004
17 pages, 6 figures, A&A ...
Mario Perinotto, Antonio Mampaso, Laura Magrini, Romano L. M. Corradi   +3 more
openaire   +5 more sources

APOGEE Chemical Abundances of the Sagittarius Dwarf Galaxy [PDF]

, 2017
The Apache Point Observatory Galactic Evolution Experiment provides the opportunity of measuring elemental abundances for C, N, O, Na, Mg, Al, Si, P, K, Ca, V, Cr, Mn, Fe, Co, and Ni in vast numbers of stars.
S. Hasselquist, M. Shetrone, V. Smith, J. Holtzman, A. McWilliam, J. Fernández-Trincado, T. Beers, S. Majewski, D. Nidever, B. Tang, P. Tissera, E. F. Alvar, C. A. Prieto, C. A. Prieto, Andres Almeida, B. Anguiano, G. Battaglia, G. Battaglia, L. Carigi, G. D. Inglada, P. Frinchaboy, D. A. García-Hernández, D. A. García-Hernández, D. Geisler, D. Minniti, V. Placco, M. Schultheis, J. Sobeck, S. Villanova   +28 more
semanticscholar   +3 more sources

Chemical Abundances of the S Star GZ Peg [PDF]

Publications of the Astronomical Society of Australia, 2009
AbstractThe chemical compositions of stars from the Asymptotic Giant Branch are still poorly known due to the low temperatures of their atmospheres and therefore the presence of many molecular transitions hampering the analysis of atomic lines. One way to overcome this difficulty is by the study of lines in regions free from molecular contamination. We
Allen, Alonso, Goriely, Gustafsson, Jorissen, L. Pompéia, Lebzelter, Smiljanic, Woolf   +8 more
openaire   +4 more sources

Chemical abundances in seven metal-poor H ii regions and a determination of the primordial helium abundance [PDF]

, 2021
We conducted a long-slit spectrophotometry analysis to obtain the chemical abundances of seven metal-poor H II regions in three galaxies: UM 160, UM 420, and TOL 0513−393.
M. Valerdi, A. Peimbert, M. Peimbert
semanticscholar   +1 more source

Chemical abundances in the nuclear region of nearby galaxies from the Palomar Survey [PDF]

, 2021
We estimate chemical abundances and ionization parameters in the nuclear region of a sample of 143 galaxies from the Palomar Spectroscopic Survey, composed by Star-Forming Galaxies (87), Seyferts 2 (16) and LINERs (40) using the Hii-Chi-mistry code.
B. P'erez-D'iaz, J. Masegosa, I. M'arquez, Enrique P'erez-Montero Instituto de Astrof'isica de Andaluc'ia, Granada, Spain   +5 more
semanticscholar   +1 more source

The Open Cluster Chemical Abundances and Mapping Survey. IV. Abundances for 128 Open Clusters Using SDSS/APOGEE DR16 [PDF]

Astronomical Journal, 2020
The Open Cluster Chemical Abundances and Mapping (OCCAM) survey aims to constrain key Galactic dynamical and chemical evolution parameters by the construction of a large, comprehensive, uniform, infrared-based spectroscopic data set of hundreds of open ...
J. Donor, P. Frinchaboy, K. Cunha, J. O’Connell, C. Prieto, Andres Almeida, F. Anders, R. Beaton, D. Bizyaev, J. Brownstein, R. Carrera, C. Chiappini, R. Cohen, D. A. García-Hernández, D. Geisler, S. Hasselquist, H. Jönsson, R. Lane, S. Majewski, D. Minniti, C. M. Bidin, K. Pan, A. Roman-Lopes, J. Sobeck, G. Zasowski   +24 more
semanticscholar   +1 more source

SPCANet: Stellar Parameters and Chemical Abundances Network for LAMOST-II Medium Resolution Survey [PDF]

Astrophysical Journal, 2020
The fundamental stellar atmospheric parameters (Teff and log g) and 13 chemical abundances are derived for medium-resolution spectroscopy from Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST) Medium Resolution Survey (MRS) data sets ...
Rui Wang, A. Luo, Jian-Jun Chen, W. Hou, Shuo Zhang, Yongheng Zhao, Xiangru Li, Yong-Hui Hou   +7 more
semanticscholar   +1 more source

Chemical Analysis of the Brightest Star of the Cetus II Ultrafaint Dwarf Galaxy Candidate

The Astrophysical Journal, 2023
We present a detailed chemical abundance analysis of the brightest star in the ultrafaint dwarf (UFD) galaxy candidate Cetus II from high-resolution Magellan/MIKE spectra.
K. B. Webber, T. T. Hansen, J. L. Marshall, J. D. Simon, A. B. Pace, B. Mutlu-Pakdil, A. Drlica-Wagner, C. E. Martínez-Vázquez, M. Aguena, S. S. Allam, O. Alves, E. Bertin, D. Brooks, A. Carnero Rosell, J. Carretero, L. N. da Costa, J. De Vicente, P. Doel, I. Ferrero, D. Friedel, J. Frieman, J. García-Bellido, G. Giannini, D. Gruen, R. A. Gruendl, S. R. Hinton, D. L. Hollowood, K. Honscheid, K. Kuehn, J. Mena-Fernández, F. Menanteau, R. Miquel, R. L. C. Ogando, M. E. S. Pereira, A. Pieres, A. A. Plazas Malagón, E. Sanchez, B. Santiago, J. Allyn Smith, M. Smith, E. Suchyta, G. Tarle, C. To, N. Weaverdyck, B. Yanny   +44 more
doaj   +1 more source