Results 311 to 319 of about 167,710 (319)

JWST Detects Silane in a Cold Low-Metallicity World

Faherty J, Meisner A, Burningham B, Visscher C, Suarez G, Gagne J, Merchan SA, Rothermich A, Line M, Burgasser A, Schneider A, Caselden D, Kirkpatrick D, Kuchner M, Gagliuffi DCB, Eisenhardt P, Gelino C, Gonzales E, Marocco F, Leggett S, Lodieu N, Casewell S, Tremblin P, Cushing M, Osorio MRZ, Béjar V, Gauza B, Wright E, Phillips M, Zhang J, Martín E.   +30 more
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Hydrodynamical Model Atmospheres of Metal‐Poor Stars

AIP Conference Proceedings, 2008
Standard one‐dimensional (1D) model atmospheres rely on the assumption of radiative equilibrium in the non‐convective part of the stellar photosphere. However, gas‐dynamical effects can lead to dramatic deviations from radiative equilibrium conditions, especially in metal‐poor stellar atmospheres.
Ludwig, Hans-Günter, González Hernández, J. I., Behara, Natalie, Caffau, Elisabetta, Steffen, Matthias   +4 more
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Beryllium in Metal-Poor Stars

1995
We present new beryllium abundances for 20 metal-poor stars with metallicities ([Fe/H]) in the range −3.1 to −0.3, most of them with [Fe/H] below −1.3. Beryllium abundances were derived from 0.06 A effective resolution spectra via spectral synthesis. Our results show evidence for a strong Be enrichment in the early Galaxy.
R. Rebolo, R. J. García López, M. R. Pérez de Taoro   +2 more
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Abundances in Very Metal-Poor Stars

Astrophysics and Space Science, 1999
Stars with a metallicity lower than [Fe/H] = −3 are of particular interest since they were formed early in the history of the Galaxy. The chemical compositions of their atmospheres represent the yields of the first massive supernovae (Ryan et al., 1991, 1996).
Spite, M.E., Spite, F., Cayrel, R., Hill, V., Nordström, B., Barbuy, B., Beers, T.C., Nissen, P.E.   +7 more
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Copper Abundances in Metal-Poor Stars

AIP Conference Proceedings, 2008
By studying the trends and possible intrinsic dispersion of element abundance ratios in extremely metal‐poor (EMP) stars it is possible to uncover information about the degree of homogenization of the early Galaxy, how the Galactic mixing processes behaved with time, and to test theoretical models predictions (e.g. Type II supernovae yields).
F. Primas, J. Sobeck, Roald Guandalini, Sara Palmerini, Maurizio Busso   +4 more
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Observing Boron in Metal-Poor Stars

Astrophysics and Space Science, 1999
A new sample of 7 stars ranging in metallicity from [Fe/H] = −2.0 to [Fe/H] = −0.75 has been analyzed in the boron spectral region. The targets were selected according to the availability (in the literature) of their lithium and beryllium abundances, because the simultaneous knowledge of LiBeB in the same targets is a powerful diagnostic for testing ...
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Metal-poor Stars: Fragmentation Thresholds and Star Formation

Research Notes of the AAS, 2018
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Metal-poor stars in dwarf galaxies

2023
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Sulphur abundances in metal-poor stars

2007
Nissen, Poul Erik, Akerman, C., Asplund, M., Fabbian, D., Pettini, M.   +4 more
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