Results 1 to 10 of about 23,626 (148)
Enhancement of Lithium in Red Clump Stars by Neutrino Magnetic Moments [PDF]
EPJ Web of Conferences, 2022 A recent spectroscopic survey has shown that the lithium abundances in low-mass red-clump stars are higher than theoretical prediction. Motivated by their finding, we implemented effects of additional energy losses induced by neutrino magnetic moments on
Mori Kanji +4 more
doaj +1 more source
Lithium abundances in exoplanet-hosts stars [PDF]
Astronomy & Astrophysics, 2007 Exoplanet-host stars (EHS) are known to present surface chemical abundances different from those of stars without any detected planet (NEHS). EHS are, on the average, overmetallic compared to the Sun. The observations also show that, for cool stars, lithium is more depleted in EHS than in NEHS. The overmetallicity of EHS may be studied in the framework
Castro, M. +3 more
openaire +5 more sources
Lithium in Kepler Red Giants: Defining Normal and Anomalous
The Astronomical Journal, 2023 The orders-of-magnitude variations in the lithium abundances of evolved stars have long been a puzzle. Diluted signals, ambiguous evolutionary states, and unknown masses have made it challenging to both map the expected lithium signals and explain the ...
Jamie Tayar +3 more
doaj +1 more source
Halo Star Lithium Depletion [PDF]
The Astrophysical Journal, 1999 39 pages LaTeX, 12 postscript figures; ApJ ...
Pinsonneault, M. H. +3 more
openaire +2 more sources
Lithium 6104 Å in Population II stars [PDF]
Astronomy & Astrophysics, 2002 We have obtained echelle spectroscopy of 14 Population II objects selected from those previously observed by Bonifacio & Molaro (1997). For one object, HD 140283, we obtained exquisite data with the High Dispersion Spectrograph on the Subaru Telescope, with S/N exceeding 1000 per 0.018A pixel.
Ford, A. +7 more
openaire +3 more sources
Lithium in Turnoff Stars in the Globular Cluster M5: A Quest for Primordial Lithium
The Astrophysical Journal, 2023 The light element lithium is formed by nucleosynthesis during the Big Bang. Its abundance can help to define the parameters of the early Universe. To find this primordial value, it is necessary to determine Li abundances in the oldest stars because it is
Ann Merchant Boesgaard +1 more
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Chemical Compositions Of Red Giant Stars in the Old Open Cluster NGC 7789
The Astronomical Journal, 2023 We have gathered optical-region spectra, derived model atmosphere parameters, and computed elemental abundances for 15 red giant stars in the open cluster NGC 7789.
Neel Nagarajan +3 more
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A Test of Pre-Main-Sequence Lithium Depletion Models [PDF]
, 2010 Despite the extensive study of lithium depletion during pre-main-sequence contraction, studies of individual stars show discrepancies between ages determined from the HR diagram and ages determined from lithium depletion (Song et al.
Baraffe +34 more
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Lithium in stars with exoplanets [PDF]
Astronomy & Astrophysics, 2004 13 pages, 10 figures, Astronomy & Astrophysics ...
Israelian, Garik +3 more
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Stabilizing carbon-lithium stars
Physical Chemistry Chemical Physics, 2011 We have explored in silico the potential energy surfaces of the C(5)Li(n)(n-6) (n = 5, 6, and 7) clusters using the Gradient Embedded Genetic Algorithm (GEGA) and other computational strategies. The most stable forms of C(5)Li(5)(-) and C(5)Li(6) are two carbon chains linked by two lithium atoms in a persistent seven membered ring capped by two Li ...
Perez-Peralta, Nancy +5 more
openaire +4 more sources