Results 11 to 20 of about 426,951 (145)

Detection of Actinides in CEMP-rs Stars

The Astrophysical Journal Letters
The carbon-enhanced metal-poor stars with hybrid enrichments of slow and rapid neutron-capture elements, the so-called CEMP-rs stars, still raise many questions due to their elusive abundance signatures.
A. M. Riyas, D. Karinkuzhi, S. Van Eck, A. Choplin, S. Goriely, L. Siess, A. A. Farha   +6 more
doaj   +5 more sources

CEMP-s and CEMP-s/r stars: last update [PDF]

EAS Publications Series, 2013
We provide an updated discussion of the sample of CEMP-s and CEMP-s/r stars collected from the literature. Observations are compared with the theoretical nucleosynthesis models of asymptotic giant branch (AGB) stars presented by Bisterzo et al.
R. Gallino, F. Käppeler, O. Straniero, M. Wiescher, S. Cristallo, S. Bisterzo   +5 more
core   +3 more sources

The puzzling frequencies of CEMP and NEMP stars [PDF]

Publications of the Astronomical Society of Australia, 2009
We present the results of binary population simulations of carbon- and nitrogen-enhanced metal-poor (CEMP and NEMP) stars. We show that the observed paucity of very nitrogen-rich stars puts strong constraints on possible modifications of the initial mass
Pols, O.R., Pols, Onno, Izzard, Robert, Astrophysics, Glebbeek, Evert, Izzard, R.G., Stancliffe, Richard R.J., Dep Natuurkunde, Stancliffe, R.J., Glebbeek, E., Sub Astrophysics begr 1/1/14   +10 more
core   +8 more sources

The Search and Study of CEMP Stars

, 2022
We report on the results of the observation and study of carbon-enhanced metal-poor (CEMP) stars. Using high resolution (R ~ 40,000) spectroscopic observations taken at the Southern African Large Telescope (SALT) of over 100 metal-poor stars we measured ...
Joseph Zepeda (17675991)
core   +2 more sources

The GALAH survey : A catalogue of carbon-enhanced stars and CEMP candidates [PDF]

Monthly Notices of the Royal Astronomical Society, 2019
Swan bands-characteristic molecular absorption features of the C2 molecule-are a spectroscopic signature of carbon-enhanced stars. They can also be used to identify carbonenhanced metal-poor (CEMP) stars. The GALAH (GALactic Archaeology with Hermes) is a
Buder, Sven, Wittenmyer, R., Kos, J., Bland-Hawthorn, Joss, Anguiano, B., Carollo, Daniela, Freeman, K., Cotar, Klemen, Traven, G., Sharma, S., Bland-Hawthorn, J., Zwitter, T., Stello, D., Anguiano, Borja, Asplund, M., Zwitter, Tomaz, Traven, Gregor, Horner, J., Sharma, Sanjib, Stello, Denis, Carollo, D., Martell, S., Nordlander, T., Nataf, David M., Nordlander, Thomas, GALAH Collaboration, Buder, S., Munari, Ulisse, Munari, U., Lewis, G., Wittenmyer, Rob A., Čotar, K., De Silva, Gayandhi M., Ting, Yuan Sen, Kos, Janez, Collaboration, G., Ting, Yuan-Sen, Martell, Sarah L., Freeman, Kenneth C., Tinney, Chris, Ting, Y., Nataf, D., Asplund, Martin, Tinney, C., de Silva, G., Lewis, Geraint F., Horner, Jonathan, De Silva, Gayandhi, Freeman, Kenneth, Lund University., Martell, Sarah   +50 more
core   +9 more sources

Are some CEMP-s stars the daughters of spinstars? [PDF]

Astronomy & Astrophysics, 2017
Carbon-enhanced metal-poor (CEMP)-s stars are long-lived low-mass stars with a very low iron content as well as overabundances of carbon and s-elements. Their peculiar chemical pattern is often explained by pollution from an asymptotic giant branch (AGB)
Georges Meynet, Hirschi, Raphael, Choplin, Arthur, Meynet, Georges, Ekström, Sylvia, Arthur Choplin, Raphael Hirschi, Sylvia Ekström   +7 more
core   +6 more sources

Lithium abundances in CEMP stars

, 2012
62 pages, 16 figures, accepted for publication in ApJInternational audienceCarbon-enhanced metal-poor (CEMP) stars are believed to show the chemical imprints of more massive stars (M > 0.8 Msun) that are now extinct.
Johnson, Jennifer J.A., Christlieb, N., Johnson, J., Christlieb, Norbert, Lucatello, Sara, Karakas, A., Johnson, J. A., Beers, T., Karakas, Amanda, Masseron, T., Masseron, Thomas, Plez, B., Plez, Bertrand, Lucatello, S., Karakas, Amanda I., Beers, T. C., Johnson, Jennifer A, Beers, Timothy C., Beers, Timothy C, Christlieb, N   +19 more
core   +4 more sources

Pre-supernova mixing in CEMP-no source stars [PDF]

Astronomy & Astrophysics, 2017
Context. CEMP-no stars are long-lived low-mass stars with a very low iron content, overabundances of carbon and no or minor signs for the presence of s- or r-elements.
Georges Meynet, Hirschi, Raphael, Choplin, Arthur, Ekström, Sylvia, Meynet, Georges, Arthur Choplin, Maeder, André, Cyril Georgy, André Maeder, Raphael Hirschi, Sylvia Ekström, Georgy, Cyril   +11 more
core   +6 more sources

The Most Metal-poor Stars. V. the CEMP-no Stars in 3D and Non-LTE [PDF]

The Astrophysical Journal, 2022
We explore the nature of carbon-rich ([C/Fe]1D,LTE > +0.7), metal-poor ([Fe/H1D,LTE] < −2.0) stars in the light of post 1D,LTE literature analyses, which provide 3D–1D and NLTE–LTE corrections for iron, and 3D–1D corrections for carbon (from the CH G ...
Norris, John, Yong, David
core   +4 more sources

An empirical metallicity tracer in CEMP and C-normal stars [PDF]

Astronomy & Astrophysics, 2020
Context. Deriving the metallicity, [Fe/H], in low-resolution spectra of carbon-enhanced metal-poor (CEMP) stars is a tedious task that, owing to the large number of line blends, often leads to uncertainties on [Fe/H] exceeding 0.25 dex.
Reichert, M., Reggiani, H. M., Byrgesen, J. S., J. S. Byrgesen, M. Reichert, H. M. Reggiani, Singh, D., Hansen, C. J., D. Singh, C. J. Hansen   +9 more
core   +4 more sources