Results 31 to 40 of about 25,571 (294)

Lithium depletion in solar-like stars: no planet connection

, 2010
We have determined precise stellar parameters and lithium abundances in a sample of 117 stars with basic properties very similar to the Sun. This sample selection reduces biasing effects and systematic errors in the analysis.
Agüeros, Allende Prieto, Asplund, Barnes, Bouvier, Castro, Castro, Charbonnel, D'Antona, Do Nascimento, Ford, Ford, Gaidos, Gonzalez, Gonzalez, Gustafsson, I. Ramírez, Ibukiyama, Israelian, Israelian, J. Meléndez, Jones, K. Lind, Lachaume, Lambert, Lind, Luck, M. Asplund, Mamajek, Meléndez, Meléndez, Meléndez, Meléndez, Montalbán, Montalbán, Nordström, P. Baumann, Pasquini, Perryman, Pinsonneault, Porto de Mello, Ramírez, Randich, Reddy, Rocha-Pinto, Ryan, Saffe, Sestito, Sestito, Soderblom, Soderblom, Sousa, Sousa, Takeda, Takeda, Takeda, Valenti, VandenBerg, Vardavas, Wright, Xiong, Yadav, Yi   +62 more
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A detailed study of Lithium in 107 CHEPS dwarf stars [PDF]

, 2017
Reproduced with permission from Astronomy & Astrophysics, © ESO 2018.Context. We report results from lithium abundance determinations using high resolution spectral analysis of the 107 metal-rich stars from the Calan-Hertfordshire Extrasolar Planet ...
Ivanyuk, O. M., Jenkins, J. S., Jones, Hugh, Kaminsky, B. M., Lyubchik, Yu. P., Pavlenko, Ya V., Yakovina, L. A.   +6 more
core   +3 more sources

DEPLETION OF TiO AND SPECTRA OF THE COOLEST BROWN DWARFS

Odessa Astronomical Publications, 2017
This study was performed in the context of the ”lithium test” for brown dwarfs proposed by Rebolo et al. (1992). We consider the formation of lithium dust species in atmospheres of the coolest stars and substellar objects.
Ya. V. Pavlenko
doaj   +1 more source

Some features of roAp stars spectrum

Odessa Astronomical Publications, 2017
We have shown the possibility for modelling Li blend6708 A, for two roAp stars, HD83368 and HD60435, taking into account lithium spots on the surfaces of these rotating stars. REE spots were also included in calculations.
A. V. Shavrina, N. S. Polosukhina, V. V. Tsymbal, Ya. V. Pavlenko, A. V. Yushchenko, V. F. Gopka, A. A. Veles   +6 more
doaj   +1 more source

Models for the lithium abundances of multiple populations in globular clusters and the possible role of the Big Bang lithium

, 2012
Globular cluster stars show chemical abundance patterns typical of hot-CNO processing. Lithium is easily destroyed by proton capture in stellar environments, so its abundance may be crucial to discriminate among different models proposed to account for ...
Annibale D'Ercole, Asplund, Bedin, Boesgaard, Cameron, Carretta, Carretta, Carretta, Cyburt, D'Antona, D'Antona, D'Ercole, D'Ercole, D'Ercole, D'Ercole, D'Orazi, D'Orazi, de Mink, Decressin, Decressin, Enrico Vesperini, Fields, Francesca D'Antona, Gratton, Gratton, Iocco, Karakas, Koch, Korn, Korn, Lind, Meléndez, Meynet, Monaco, Monaco, Norris, Paolo Ventura, Pasquini, Pasquini, Piau, Piau, Prantzos, Ramírez, Renzini, Richard, Roberta Carini, Sbordone, Shen, Sills, Spergel, Vanbeveren, Ventura, Ventura, Ventura, Ventura, Ventura   +55 more
core   +1 more source

Li isotopes in metal-poor halo dwarfs, a more and more complicated story [PDF]

, 2009
The nuclei of the lithium isotopes are fragile, easily destroyed, so that, at variance with most of the other elements, they cannot be formed in stars through steady hydrostatic nucleosynthesis.
Alonso, Boesgaard, Bonifacio, Cayrel, Cayrel, Charbonnel, François Spite, García Pérez, García Pérez, González Hernández, Hosford, Molaro, Monique Spite, Nissen Poul, Sbordone, Spite, Spite, Spite, Steffen, Talon   +19 more
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THE STARS OF THE LOWER PART OF MAIN SEQUENCE

Odessa Astronomical Publications, 2007
Atmospheric parameters (Teff , log g, [Fe/H], Vt), Li, and volatile (O, Na, Al, Zn) and refractory (Si, Ti, V, Cr, Co and Ni) element abundances in 133 stars belonging to the low part of MS have been determined. Among them about 30 stars are the variable
T. V. Mishenina, S. I. Belik, I. A. Usenko, O. Bienayme, C. Soubiran, V. V. Kovtyukh, S. A. Korotin   +6 more
doaj   +1 more source

Observational signatures of lithium depletion in the metal-poor globular cluster NGC6397

, 2010
The "stellar" solution to the cosmological lithium problem proposes that surface depletion of lithium in low-mass, metal-poor stars can reconcile the lower abundances found for Galactic halo stars with the primordial prediction.
Asplund, M., Charbonnel, C., Grundahl, F., Lind, K., Primas, F.   +4 more
core   +1 more source

Lithium abundances in carbon stars

The Astrophysical Journal, 1991
High-dispersion, high signal-to-noise ratio spectra near 6707 A have provided Li abundances for 29 cool carbon stars. The Li abundances are on average lower than found for M giants. This difference may be due to a systematic underestimate of the carbon stars' effective temperatures by 200-400 K. It is possible that Li may be destroyed at the base of an
Grant R. Denn, R. E. Luck, David L. Lambert   +2 more
openaire   +1 more source

The lithium content of the galactic halo stars [PDF]

EAS Publications Series, 2005
34 pages. Accepted for publication in A&A.
Charbonnel, C., Primas, F.
openaire   +3 more sources