Results 1 to 10 of about 4,382,200 (272)

Chemical Abundances of a Sample of Oxygen-dominated Galaxies [PDF]

The Astrophysical Journal, 2023
We spectroscopically analyzed a sample of 85 Sloan Digital Sky Survey compact, oxygen-dominated galaxies located at redshift z ∼ 0.001–0.350, selected because of their large equivalent width of [O iii ] λ 5007 (larger than 200 Å). These galaxies might be
B. E. Miranda-Pérez, A. M. Hidalgo-Gámez   +1 more
doaj   +2 more sources

Chemical abundances of stars with brown-dwarf companions [PDF]

, 2014
It is well-known that stars with giant planets are on average more metal-rich than stars without giant planets, whereas stars with detected low-mass planets do not need to be metal-rich.
Hernández, J. I. González, Israelian, G., Sahlmann, J., Santos, N. C., Sánchez, D. Mata, Udry, S.   +5 more
core   +2 more sources

APOGEE Chemical Abundances of the Sagittarius Dwarf Galaxy [PDF]

, 2017
The Apache Point Observatory Galactic Evolution Experiment (APOGEE) provides the opportunity to measure 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.
Almeida, Andres, Alvar, Emma Fernández, Anguiano, Borja, Battaglia, Giuseppina, Beers, Timothy C., Carigi, Leticia, Fernández-Trincado, J. G., Frinchaboy, Peter, García-Hernández, D. A., Geisler, Doug, Hasselquist, Sten, Holtzman, Jon, Inglada, Gloria Delgado, Majewski, Steven R., McWilliam, Andrew, Minniti, Dante, Nidever, David L., Placco, Vinicius M., Prieto, Carlos Allende, Schultheis, Mathias, Shetrone, Matthew, Smith, Verne, Sobeck, Jennifer, Tang, Baitian, Tissera, Patricia B., Villanova, Sandro   +25 more
core   +2 more sources

APOGEE chemical abundances of globular cluster giants in the inner Galaxy [PDF]

, 2016
We report chemical abundances obtained by Sloan Digital Sky Survey (SDSS)-III/Apache Point Observatory Galactic Evolution Experiment for giant stars in five globular clusters located within 2.2 kpc of the Galactic Centre.
Ricardo P. Schiavon, Jennifer A. Johnson, Peter M. Frinchaboy, Gail Zasowski, Szabolcs Mészáros, D. A. García–Hernández, Roger E. Cohen, Baitian Tang, S. Villanova, D. Geisler, Timothy C. Beers, José G. Fernández-Trincado, A. E. García Pérez, S. Lucatello, Steven R. Majewski, Sarah L. Martell, R. W. O’Connell, Carlos Prieto, Dmitry Bizyaev, R. Carrera, Richard R. Lane, Elena Malanushenko, Viktor Malanushenko, Ricardo R. Muñoz, Christian Nıtschelm, Daniel Oravetz, Kaike Pan, Alexandre Roman–Lopes, M. Schultheis, A. Simmons   +29 more
openalex   +3 more sources

Unveiling the time evolution of chemical abundances across the Milky Way disk with APOGEE [PDF]

Monthly notices of the Royal Astronomical Society, 2023
Chemical abundances are an essential tool in untangling the Milky Way’s enrichment history. However, the evolution of the interstellar medium abundance gradient with cosmic time is lost as a result of radial mixing processes.
B. Ratcliffe, I. Minchev, F. Anders, S. Khoperskov, G. Guiglion, T. Buck, K. Cunha, A. Queiroz, C. Nitschelm, Szabolcs Mészáros, M. Steinmetz, R. D. de Jong, S. Nepal, R. Lane, J. Sobeck   +14 more
semanticscholar   +1 more source

Detailed Chemical Abundances for a Benchmark Sample of M Dwarfs from the APOGEE Survey [PDF]

Astrophysical Journal, 2022
Individual chemical abundances for 14 elements (C, O, Na, Mg, Al, Si, K, Ca, Ti, V, Cr, Mn, Fe, and Ni) are derived for a sample of M dwarfs using high-resolution, near-infrared H-band spectra from the Sloan Digital Sky Survey-IV/Apache Point Observatory
D. Souto, K. Cunha, V. Smith, C. Prieto, K. Covey, D. A. García-Hernández, J. Holtzman, H. Jönsson, S. Mahadevan, S. Majewski, T. Masseron, M. Pinsonneault, D. Schneider, M. Shetrone, K. Stassun, R. Terrien, O. Zamora, G. Stringfellow, R. Lane, C. Nitschelm, B. Rojas-Ayala   +20 more
semanticscholar   +1 more source

Chemical Abundances for 25 JWST Exoplanet Host Stars with KeckSpec [PDF]

Research Notes of the AAS, 2022
Using a data-driven machine learning tool we report T eff, log(g) , vsin(i) , and elemental abundances for 15 elements (C, N, O, Na, Mg, Al, Si, Ca, Ti, V, Cr, Mn, Fe, Ni, Y) for a sample of 25 exoplanet host stars targeted by JWST's first year of ...
A. Polanski, I. Crossfield, A. Howard, H. Isaacson, M. Rice   +4 more
semanticscholar   +1 more source

The Open Cluster Chemical Abundances and Mapping Survey. VI. Galactic Chemical Gradient Analysis from APOGEE DR17 [PDF]

Astronomical Journal, 2022
The goal of the Open Cluster Chemical Abundances and Mapping (OCCAM) survey is to constrain key Galactic dynamic and chemical evolution parameters by the construction and analysis of a large, comprehensive, uniform data set of infrared spectra for stars ...
Natalie Myers, J. Donor, Taylor Spoo, P. Frinchaboy, K. Cunha, A. Price-Whelan, S. Majewski, R. Beaton, G. Zasowski, J. O’Connell, A. Ray, D. Bizyaev, C. Chiappini, D. A. Garc'ia-Hern'andez, D. Geisler, H. Jönsson, R. Lane, P. Longa-Peña, I. Minchev, D. Minniti, C. Nitschelm, A. Roman-Lopes   +21 more
semanticscholar   +1 more source

Detailed Chemical Abundances of Stars in the Outskirts of the Tucana II Ultrafaint Dwarf Galaxy [PDF]

Astronomical Journal, 2022
We present chemical abundances and velocities of five stars between 0.3 and 1.1 kpc from the center of the Tucana II ultrafaint dwarf galaxy (UFD) from high-resolution Magellan/MIKE spectroscopy. We find that every star is deficient in metals (−3.6 < [Fe/
A. Chiti, A. Frebel, A. Ji, Mohammad K. Mardini, X. Ou, J. Simon, H. Jerjen, Dongwon Kim, J. Norris   +8 more
semanticscholar   +1 more source

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