Results 21 to 30 of about 627,744 (337)

New calibrations for abundance determinations in HII regions [PDF]

, 2016
Simple relations for deriving the oxygen abundance in HII regions with intensities of the three strong emission lines R_2, R_3, and N_2 (R calibration) or S_2, R_3, and N_2 (S calibration) in their spectra are suggested.
Grebel, E. K., Pilyugin, L. S.
core   +2 more sources

Cu I resonance lines in turn-off stars of NGC 6752 and NGC 6397. Effects of granulation from CO5BOLD models [PDF]

, 2010
Context. Copper is an element whose interesting evolution with metallicity is not fully understood. Observations of copper abundances rely on a very limited number of lines, the strongest are the Cu I lines of Mult.
Bonifacio, Piercarlo, Caffau, Elisabetta, Ludwig, Hans-Günter   +2 more
core   +5 more sources

Chemical Composition of RR Lyn – an Eclipsing Binary System with Am and λ Boo Type Components [PDF]

Journal of Astronomy and Space Sciences, 2017
High-resolution spectroscopic observations of the eclipsing binary system RR Lyn were made using the 1.8 m telescope at the Bohuynsan Optical Astronomical Observatory in Korea.
Yeuncheol Jeong, Alexander V. Yushchenko, Dmytry N. Doikov, Vira F. Gopka, Volodymyr O. Yushchenko   +4 more
doaj   +1 more source

Calcareous Nannofossils Biostratigraphy of Late Cretaceous–Paleocene Successions from Northern Jordan and Their Implications for Basin Analysis

Geosciences, 2023
Local geological and tectonic processes have been pivotal in shaping the diverse sedimentation patterns observed in Jordan, forming sub-basins characterized by elevated organic matter content (TOC). This study aims to characterize the Maastrichtian basin,
Albesher Hussein, Osama M. Al-Tarawneh, Mohammad Alqudah   +2 more
doaj   +1 more source

Constraints on the nucleosynthesis of refractory nuclides in galactic cosmic rays [PDF]

, 2001
Abundances of the isotopes of the refractory elements Ca, Fe, Co, and Ni in the galactic cosmic-ray source are compared with corresponding abundances in solar-system matter.
Binns, W. R., Christian, E. R., Cummings, A. C., Davis, A. J., George, J. S., Hink, P. L., Israel, M. H., Leske, R. A., Mewaldt, R. A., Stone, E. C., von Rosenvinge, T. T., Wiedenbeck, M. E., Yanasak, N. E.   +12 more
core   +1 more source

Light Elements in the Universe

Frontiers in Astronomy and Space Sciences, 2021
Due to their production sites, as well as to how they are processed and destroyed in stars, the light elements are excellent tools to investigate a number of crucial issues in modern astrophysics: from stellar structure and non-standard processes at work
Sofia Randich, Laura Magrini
doaj   +1 more source

Determining solar abundances using helioseismology [PDF]

, 2006
The recent downward revision of solar photospheric abundances of Oxygen and other heavy elements has resulted in serious discrepancies between solar models and solar structure as determined through helioseismology.
Antia H. M., Basu S., Basu S., Basu S., Eggleton P. P., Elliott J. R., Gough D. O., H. M. Antia, Sarbani Basu   +8 more
core   +2 more sources

Planetary Nebulae: Abundances and Abundance Gradients [PDF]

, 2000
In this work, a review is given of some recent results and problems involved in the determination of chemical abundances of galactic planetary nebulae, particularly regarding disk and bulge objects.
openaire   +2 more sources

A Model for Abundances in Metal-Poor Stars [PDF]

, 2001
It is argued that the abundances of r-process related elements in stars with -3-3. The H events are of high frequency and produce dominantly heavy (A>130) r-elements but no Fe (presumably leaving behind black holes).
G. J. Wasserburg, Gratton R. G., Magain P., Truran J. W., Y.‐Z. Qian, Zhao G.   +5 more
core   +3 more sources

Abundance

, 2021
Abstract The book examines the experience of living in a society that has more information available to the public than ever before. It focuses on the interpretations, emotions, and practices of dealing with this abundance in everyday life.
  +6 more sources