Results 21 to 30 of about 694,028 (301)
Lithium in stars with exoplanets [PDF]
Proceedings of the International Astronomical Union, 2009 AbstractOur recent study of solar-type stars from the HARPS GTO sample provides highly accurate information with regard to Lithium abundances in stars with and without detected planets (Israelian et al. 2009). When the Li abundances of planet bearing stars are compared with the “single” stars, we find an excess of Li depletion in planet hosts with ...
openaire +1 more source
THE NATURE OF MAGNETIC CHEMICALLY PECULIAR STARS PHENOMENON AND THE ORIGIN OF LITHIUM
Odessa Astronomical Publications, 2012 According to the modern theory of the evolution of chemical elements their origin seems understandable for most of the elements, from the lightest up to the heavy ones.
V. F. Gopka +3 more
doaj +1 more source
The ups and downs of inferred cosmological lithium [PDF]
EPJ Web of ConferencesI summarize the stellar side of the cosmological lithium problem(s). Evidence from independent studies is accumulating and indicates that stars may very well be fully responsible for lowering their surface lithium from the predicted primordial value to ...
Korn Andreas
doaj +1 more source
Lithium-rich stars in the Sloan Digital Sky Survey [PDF]
, 2012 We report the discovery of 23 lithium-rich post-main-sequence stars, identified from moderate-resolution SDSS spectroscopy and confirmed with high-resolution spectra taken at the Hobby-Eberly Telescope. These new Li-rich stars cover a broad range in mass
Martell, Sarah L. +3 more
core +1 more source
Symposium - International Astronomical Union, 2000 Lithium continues to be a surprising element and more than ever the study of its creation, destruction and distribution is giving us tools to understand, not only the chemical evolution of this element, but also the nature of mass loss of evolved giants and nucleosynthesis of other elements in cases of very low-metal giants.
openaire +1 more source
DISCOVERY OF TWO LITHIUM CEPHEIDS IN THE GALAXY
Odessa Astronomical Publications, 2017 We report about the discovery of two lithium Cepheids in the Galaxy, based on observations made with the echelle spectrograph of the Apache Point Observatory. We have used high- resolution, high signal-to-noise spectra to determine abundances of chemical
V. V. Kovtyukh +2 more
doaj +1 more source
The Occurrence of Lithium in Stars [PDF]
Highlights of Astronomy, 1968 My task is to outline our present observational knowledge of the occurrence of lithium in stellar atmospheres. On account of the limited time, I shall not attempt to include a description of the situation in post-main sequence stars. Also for shortness of time, forgive me if I do not stop at each point to give due credit to the astronomers who have ...
openaire +1 more source
Lithium production in SAGB stars [PDF]
, 2012 We explore the production of and stellar yields of 7Li for a range of mass and metallicity. We test the effect of varying the mass loss rate and well as the mixing length parameter on the production of lithium.
Lau, Herbert H B +3 more
core +3 more sources
The Lithium Isotope Ratio in Old Stars [PDF]
Highlights of Astronomy, 1995 The lithium isotope ratio in stars can be determined from high resolution observations of the profile of the Li I 6707 Å absorption line. Earlier studies of old F and G stars (Andersen et al. 1984, Maurice et al. 1984, Pilachowski et al. 1989) have led to upper limits of 6Li/7Li ranging from 0.05 to 0.10.
openaire +2 more sources
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