Zobrazeno 1 - 10
of 385
pro vyhledávání: '"Cayrel, R."'
Autor:
Hernández, J. I. González, Bonifacio, P., Caffau, E., Ludwig, H. G., Steffen, M., Monaco, L., Cayrel, R.
Publikováno v:
A&A 628, A111 (2019)
We present high-resolution and high-quality UVES spectroscopic data of the metal-poor double-lined spectroscopic binary CS 22876--032 ([Fe/H] $\sim -3.7$ dex), with the goal to derive the $^6$Li/$^7$Li isotopic ratio by analysing the \ion{Li}{i} $\la
Externí odkaz:
http://arxiv.org/abs/1907.05109
Autor:
François, P., Caffau, E., Bonifacio, P., Spite, M., Spite, F., Cayrel, R., Christlieb, N., Gallagher, A. J., Klessen, R., Koch, A., Ludwig, H. -G., Monaco, L., Plez, B., Steffen, M., Zaggia, S.
Extremely metal-poor stars are keys to understand the early evolution of our Galaxy. The ESO large programme TOPoS has been tailored to analyse a new set of metal-poor turn-off stars, whereas most of the previously known extremely metal-poor stars ar
Externí odkaz:
http://arxiv.org/abs/1811.00035
Autor:
Bonifacio, P., Caffau, E., Spite, M., Spite, F., Sbordone, L., Monaco, L., François, P., Plez, B., Molaro, P., Gallagher, A. J., Cayrel, R., Christlieb, N., Klessen, R. S., Koch, A., Ludwig, H. -G., Steffen, M., Zaggia, S., Abate, C.
Publikováno v:
A&A 612, A65 (2018)
Extremely metal-poor stars provide us with indirect information on the first generations of massive stars. The TOPoS survey has been designed to increase the census of these stars and to provide a chemical inventory that is as detailed as possible. S
Externí odkaz:
http://arxiv.org/abs/1801.03935
Autor:
Bonifacio, P., Caffau, E., Ludwig, H. -G., Steffen, M., Castelli, F., Gallagher, A. J., Kučinskas, A., Prakapavičius, D., Cayrel, R., Freytag, B., Plez, B., Homeier, D.
Publikováno v:
A&A 611, A68 (2018)
The atmospheres of cool stars are temporally and spatially inhomogeneous due to the effects of convection.The influence of this inhomogeneity, referred to as granulation, on colours has never been investigated over a large range of effective temperat
Externí odkaz:
http://arxiv.org/abs/1712.00024
Autor:
Caffau, E., Bonifacio, P., Spite, M., Spite, F., Monaco, L., Sbordone, L., Francois, P., Gallagher, A. J., Plez, B., Zaggia, S., Ludwig, H. -G., Cayrel, R., Koch, A., Steffen, M., Salvadori, S., Klessen, R., Glover, S., Christlieb, N.
One of the primary objectives of the TOPoS survey is to search for the most metal-poor stars. Our search has led to the discovery of one of the most iron-poor objects known, SDSS\,J092912.32+023817.0. This object is a multiple system, in which two co
Externí odkaz:
http://arxiv.org/abs/1610.04106
Autor:
Steffen, M., Prakapavičius, D., Caffau, E., Ludwig, H. -G., Bonifacio, P., Cayrel, R., Kučinskas, A., Livingston, W. C.
Publikováno v:
A&A 583, A57 (2015)
The solar photospheric oxygen abundance is still widely debated. Adopting the solar chemical composition based on the "low" oxygen abundance, as determined with the use of three-dimensional (3D) hydrodynamical model atmospheres, results in a well-kno
Externí odkaz:
http://arxiv.org/abs/1508.03487
Autor:
Bonifacio, P., Caffau, E., Spite, M., Limongi, M., Chieffi, A., Klessen, R. S., François, P., Molaro, P., Ludwig, H. G., Zaggia, S., Spite, F., Plez, B., Cayrel, R., Christlieb, N., Clark, P. C., Glover, S. C. O., Hammer, F., Koch, A., Monaco, L., Sbordone, L., Steffen, M.
Publikováno v:
A&A 579, A28 (2015)
In the course of the TOPoS (Turn Off Primordial Stars) survey, aimed at discovering the lowest metallicity stars, we have found several carbon-enhanced metal-poor (CEMP) stars. We here present our analysis of six CEMP stars. Calcium and carbon are th
Externí odkaz:
http://arxiv.org/abs/1504.05963
Autor:
Siqueira-Mello, C., Hill, V., Barbuy, B., Spite, M., Spite, F., Beers, T. C., Caffau, E., Bonifacio, P., Cayrel, R., François, P., Schatz, H., Wanajo, S.
Moderately r-process-enriched stars (r-I) are at least four times as common as those that are greatly enriched in r-process elements (r-II), and the abundances in their atmospheres are important tools for obtaining a better understanding of the nucle
Externí odkaz:
http://arxiv.org/abs/1404.0234
Autor:
Caffau, E., Bonifacio, P., Sbordone, L., Francois, P., Monaco, L., Spite, M., Plez, B., Cayrel, R., Christlieb, N., Clark, P., Glover, S., Klessen, R., Koch, A., Ludwig, H. -G., Spite, F., Steffen, M., Zaggia, S.
The metal-weak tail of the metallicity distribution function (MDF) of the Galactic Halo stars contains crucial information on the formation mode of the first generation of stars. To determine this observationally, it is necessary to observe large num
Externí odkaz:
http://arxiv.org/abs/1310.6963
Autor:
Caffau, E., Bonifacio, P., Francois, P., Sbordone, L., Spite, M., Monaco, L., Plez, B., Spite, F., Zaggia, S., Ludwig, H. -G., Cayrel, R., Molaro, P., Randich, S., Hammer, F., Hill, V.
The extremely metal-poor stars are the direct descendants of the first generation stars. They carry the chemical signature of the pristine Universe at the time they formed, shortly after the Big Bang. We aim to derive information about extremely meta
Externí odkaz:
http://arxiv.org/abs/1309.4913