Zobrazeno 1 - 10
of 705
pro vyhledávání: '"Aguado D"'
Autor:
Molaro, P., Aguado, D. S., Caffau, E., Prieto, C. Allende, Bonifacio, P., Hernandez, J. I. Gonzalez, Rebolo, R., Osorio, M. R. Zapatero, Cristiani, S., Pepe, F., Santos, N. C., Alibert, Y., Cupani, G., Di Marcantonio, P., D'Odorico, V., Lovis, C., Martins, C. J. A. P., Milakovic, D., Murphy, M., Nunes, N. J., Schmidt, T. M., Sousa, S., Sozzetti, a., Mascareno, A. Suarez
Publikováno v:
A&A 679, A72 (2023)
The known Mega and Hyper Metal-Poor (MMP-HMP) stars with [Fe/H]<-6.0 and <-5.0, respectively, likely belong to the CEMP-no class, i.e. carbon-enhanced stars with low or absent second peak neutron capture elements. They are likely second generation st
Externí odkaz:
http://arxiv.org/abs/2309.11664
Autor:
Mashonkina, L., Arentsen, A., Aguado, D. S., Smogorzhevskii, A., Hampel, M., Karakas, A., Sestito, F., Martin, N. F., Venn, K. A., Hernández, J. I. González
Well-studied very metal-poor (VMP, [Fe/H] < -2 ) stars in the inner Galaxy are few in number, and they are of special interest because they are expected to be among the oldest stars in the MilkyWay. We present high-resolution spectroscopic follow-up
Externí odkaz:
http://arxiv.org/abs/2305.10717
Autor:
Aguado, D. S., Salvadori, S., Skúladóttir, A., Caffau, E., Bonifacio, P., Vanni, I., Gelli, V., Koutsouridou, I., Amarsi, A. M.
The very massive first stars ($m>100\rm M_{\odot}$) were fundamental to the early phases of reionization, metal enrichment, and super-massive black hole formation. Among them, those with $140\leq\rm m/\rm M_{\odot}\leq260$ are predicted to evolve as
Externí odkaz:
http://arxiv.org/abs/2301.03604
Autor:
Aguado, D. S., Caffau, E., Molaro, P., Prieto, C. Allende, Bonifacio, P., Hernández, J. I. González, Rebolo, R., Salvadori, S., Osorio, M. R. Zapatero, Cristiani, S., Pepe, F., Santos, C., Cupani, G., Di Marcantonio, P., D'Odorico, V., Lovis, C., Nunes, N. J., Martins, C. J. A. P., Milakovic, D., Rodrigues, J., Schmidt, T. M., Sozzetti, A., Mascareño, A. Suarez
SMSS J160540.18$-$144323.1 is the carbon-enhanced metal-poor (CEMP) star with the lowest iron abundance ever measured, [Fe/H]=-6.2, which was first reported with the SkyMapper telescope. The carbon abundance is A(C)~6.1 in the low-C band, as the majo
Externí odkaz:
http://arxiv.org/abs/2301.02678
Autor:
Aguado, D., Molaro, P., Caffau, E., Hernández, J. I. González, Osorio, M. Zapatero, Bonifacio, P., Prieto, C. Allende, Rebolo, R., Damasso, M., Mascareño, A. Suárez, Howell, S. B., Furlan, E., Cristiani, S., Cupani, G., Di Marcantonio, P., D'Odorico, V., Lovis, C., Martins, C. J. A. P., Milakovic, D., Murphy, M. T., Nunes, N. J., Pepe, F., Santos, N. C., Schmidt, T. M., Sozzetti, A.
Publikováno v:
A&A 668, A86 (2022)
HE 0107$-$5240 is a hyper metal-poor star with $\rm [Fe/H]=-5.39$. We performed high-res observations with the ESPRESSO spectrograph at the VLT to constrain the kinematical properties of the binary system HE 0107$-$5240 and to probe the binarity of t
Externí odkaz:
http://arxiv.org/abs/2210.04910
The Ca~II H \& K lines are among the few features available to infer the metallicity of extremely metal-poor stars from medium-resolution spectroscopy. Unfortunately, these lines can overlap with absorption produced in the intervening interstellar me
Externí odkaz:
http://arxiv.org/abs/2203.01257
Autor:
Lucchesi, R., Lardo, C., Jablonka, P., Sestito, F., Mashonkina, L., Arentsen, A., Suter, W., Venn, K., Martin, N., Starkenburg, E., Aguado, D., Hill, V., Kordopatis, G., Navarro, J. F., Hernández, J. I. González, Malhan, K., Yuan, Z.
We present a one-dimensional, local thermodynamic equilibrium (1D-LTE) homogeneous analysis of 132 stars observed at high-resolution with ESPaDOnS. This represents the largest sample observed at high resolution (R$\sim$40,000) from the Pristine surve
Externí odkaz:
http://arxiv.org/abs/2112.10792
Autor:
Mascareño, A. Suárez, Damasso, M., Lodieu, N., Sozzetti, A., Béjar, V. J. S., Benatti, S., Osorio, M. R. Zapatero, Micela, G., Rebolo, R., Desidera, S., Murgas, F., Claudi, R., Hernández, J. I. González, Malavolta, L., del Burgo, C., D'Orazi, V., Amado, P. J., Locci, D., Tabernero, H. M., Marzari, F., Aguado, D. S., Turrini, D., Guillén, C. Cardona, Toledo-Padrón, B., Maggio, A., Aceituno, J., Bauer, F. F., Caballero, J. A., Chinchilla, P., Esparza-Borges, E., González-Álvarez, E., Granzer, T., Luque, R., Martín, E. L., Nowak, G., Oshagh, M., Pallé, E., Parviainen, H., Quirrenbach, A., Reiners, A., Ribas, I., Strassmeier, K. G., Weber, M., Mallonn, M.
Current theories of planetary evolution predict that infant giant planets have large radii and very low densities before they slowly contract to reach their final size after about several hundred million years. These theoretical expectations remain u
Externí odkaz:
http://arxiv.org/abs/2111.09193
Autor:
Lardo, C., Mashonkina, L., Jablonka, P., Bonifacio, P., Caffau, E., Aguado, D. S., Hernández, J. I. González, Sestito, F., Kielty, C. L., Venn, K. A., Hill, V., Starkenburg, E., Martin, N. F., Sitnova, T., Arentsen, A., Carlberg, R. G., Navarro, J. F., Kordopatis, G.
Elemental abundances of the most metal-poor stars reflect the conditions in the early Galaxy and the properties of the first stars. We present a spectroscopic follow-up of two ultra metal-poor stars ([Fe/H]<-4.0) identified by the survey {\em Pristin
Externí odkaz:
http://arxiv.org/abs/2109.14477
Publikováno v:
2021, MNRAS, 505, 6051
We present the results of a near-infrared (NIR) monitoring program carried out between 1999 and 2005 to determine the variability properties of the Arecibo sample of OH/IR stars. The sample consists of 385 IRAS-selected Asymptotic Giant Branch (AGB)
Externí odkaz:
http://arxiv.org/abs/2105.05122