Results 21 to 30 of about 60,044 (291)

Stratification and Isotope Separation in CP Stars [PDF]

, 2009
We investigate the elemental and isotopic stratification in the atmospheres of selected chemically peculiar (CP) stars of the upper main sequence. Reconfiguration of the UVES spectrograph in 2004 has made it possible to examine all three lines of the Ca ...
Appenzeller, Babcock, Babel, Babel, Bagnulo, Binney, Bohlender, Brage, C. R. Cowley, Castelli, Cowley, Cowley, Cowley, Cowley, Cowley, Dworetsky, Gelbmann, Handler, Hubrig, Hubrig, J. F. González, Kochukhov, Kunzli, Kupka, LeBlanc, Lemke, Lucke, Meléndez, Michaud, Moon, Munari, Nörtershäuser, Paunzen, Preston, Proffitt, Rogers, Ryabchikova, Ryabchikova, Ryabchikova, Ryabchikova, Ryabchikova, S. Hubrig, Sbordone, Schlegel, Sigut, Stehlé, Thiam, Woolf   +47 more
core   +3 more sources

Isotopic Abundances of Carbon and Oxygen in Oxygen-Rich Giant Stars [PDF]

, 2006
16O/17O and 12C/13C ratios in 23 M giants are determined from high resolution IR spectra observed with the KPNO FTS. The masses of our sample are estimated with the use of the evolutionary tracks by Claret (2004), which could account for only about half ...
Claret, Takashi Tsuji, Tsuji, Tsuji
core   +2 more sources

Applications of Abundance Data and Requirements for Cosmochemical Modeling [PDF]

, 2001
Understanding the evolution of the universe from Big Bang to its present state requires an understanding of the evolution of the abundances of the elements and isotopes in galaxies, stars, the interstellar medium, the Sun and the heliosphere, planets and
Binns, W. R., Busemann, H., Chiappini, C., Gloeckler, G., Hoppe, P., Kirilova, D., Leske, R. A., Manuel, O. K., Mewaldt, R. A., Möbius, E., Wieler, R., Wiens, R. C., Wimmer-Schweingruber, R. F., Yanasak, N. E.   +13 more
core   +2 more sources

An Elemental Assay of Very, Extremely, and Ultra Metal-Poor Stars [PDF]

, 2015
We present a high-resolution elemental-abundance analysis for a sample of 23 very metal-poor (VMP; [Fe/H] < -2.0) stars, 12 of which are extremely metal-poor (EMP; [Fe/H] < -3.0), and 4 of which are ultra metal-poor (UMP; [Fe/H] < -4.0). These stars were
Asplund, M., Beers, T. C., Bessell, M. S., Christlieb, N., Frebel, A., Hansen, C. J., Hansen, T., Norris, J. E., Perez, A. E. Garcia, Placco, V. M., Yong, D.   +10 more
core   +2 more sources

Re-Os isotope and platinum group elements of a FOcal ZOne mantle source, Louisville Seamounts Chain, Pacific ocean [PDF]

, 2015
The Louisville Seamount Chain (LSC) is, besides the Hawaiian-Emperor Chain, one of the longest-lived hotspot traces. We report here the first Re-Os isotope and platinum group element (PGE) data for Canopus, Rigil, and Burton Guyots along the chain, which
Akira Ishikawa, Barnes, Becker, Beier, Bennett, Bezos, Brandon, Bryce, Burton, Chazey, Cheng, Cohen, Courtillot, Dale, Day, Eisele, Farley, Fischer-Gödde, Fitton, Fitton, Fleet, Gaffney, Godfrey Fitton, Hanan, Hanyu, Hanyu, Hart, Hauri, Hawkins, Ireland, Ishikawa, Jackson, Jackson, Jamais, Katsuhiko Suzuki, Kellogg, Koppers, Koppers, Koppers, Lassiter, Lassiter, Lassiter, Lee, Lonsdale, Luguet, Mahoney, Mahoney, Maria Luisa G. Tejada, Martin, Martin, Meisel, Meisel, Mungall, Nichols, Norman, Palme, Peucker-Ehrenbrink, Peucker-Ehrenbrink, Pitcher, Rebecca Williams, Reisberg, Reisberg, Roy-Barman, Ryoko Senda, Schiano, Schiano, Sen, Shinotsuka, Sobolev, Sobolev, Stracke, Takeshi Hanyu, Tatsumi, Tatsumi, Tejada, Tejada, Tejada, Tejada, Vanderkluysen, Walker, Watts   +80 more
core   +1 more source

Neon in interior of the asteroid Vesta and comparison with the terrestrial planets

Journal of Asian Earth Sciences: X, 2022
We investigate the neon isotopic composition and elemental abundance in eucrites and diogenites and compare them with the inventories from interiors of the terrestrial planets.
Satvika Jaiswal, Ramakant R. Mahajan, Mamata Ngangom   +2 more
doaj   +1 more source

Presolar Diamond in Meteorites [PDF]

, 2009
Presolar diamond, the carrier of the isotopically anomalous Xe component Xe-HL, was the first mineral type of presolar dust that was isolated from meteorites. The excesses in the light, p-process only isotopes 124Xe and 126Xe, and in the heavy, r-process
Anders, Argast, Black, Heymann, Heymann, Howard, Huss, Huss, Jungck, Lewis, Lodders, Maas, Meyer, Pellin, Pignatari, Rayet, Richter, Russell, Sachiko Amari, Takahashi, Tang, Zinner   +21 more
core   +1 more source

Isotopic Abundances in Comets [PDF]

Symposium - International Astronomical Union, 1987
It is belived that the unprocessed material of the solar nebula may be preserved in comets. Thus the data concerning the chemical composition and the abundance of stable isotopes in these primitive bodies are of some importance in cosmological and cosmogonical context.
openaire   +1 more source

Isotope abundance in platinum

Proceedings of the Indian Academy of Sciences - Section A, 1935
The relative abundance of the isotopes of platinum is estimated from an analysis of the microphotograms of the structure pattern of Pt I λ 3408·13 A (a3F4—z5D4°). Assuming a positive isotope shift, the isotopes of platinum with their relative abundance are as follows:— Mass Number .. 196 195 194 192 Relative abundance ..
Venkatesachar, B., Sibaiya, L.
openaire   +1 more source

AGB Stars and Their Circumstellar Envelopes. I. the VULCAN Code

Universe, 2021
The interplay between AGB interiors and their outermost layers, where molecules and dust form, is a problem of high complexity. As a consequence, physical processes like mass loss, which depend on the chemistry of the circumstellar envelope, are often ...
Sergio Cristallo, Luciano Piersanti, David Gobrecht, Lucio Crivellari, Ambra Nanni   +4 more
doaj   +1 more source