Zobrazeno 1 - 10
of 605
pro vyhledávání: '"Navarro J. F."'
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:
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
Autor:
Gallart, C., Monelli, M., Ruiz-Lara, T., Calamida, A., Cassisi, S., Cignoni, M., Anderson, J., Battaglia, G., Bermejo-Climent, J. R., Bernard, E. J., Martínez-Vázquez, C. E., Mayer, L., Salvadori, S., Monachesi, A., Navarro, J. F., Shen, S., Surot, F., Tosi, M., Bajaj, V., Strinfellow, G. S.
Eridanus II (EriII) is an ultra-faint dwarf (UFD) galaxy (M_V=-7.1) located at a distance close to the Milky Way virial radius. Early shallow color-magnitude diagrams (CMD) indicated that it possibly hosted an intermediate-age or even young stellar p
Externí odkaz:
http://arxiv.org/abs/2101.04464
Publikováno v:
A&A 648, A124 (2021)
Elliptical (E) and spiral (S) galaxies follow tight, but different, scaling laws that link their stellar masses, radii, and characteristic velocities. Mass and velocity, for example, scale tightly in spirals with little dependence on galaxy radius (t
Externí odkaz:
http://arxiv.org/abs/2009.03916
Autor:
Guiglion, G., Matijevic, G., Queiroz, A. B. A., Valentini, M., Steinmetz, M., Chiappini, C., Grebel, E. K., McMillan, P. J., Kordopatis, G., Kunder, A., Zwitter, T., Khalatyan, A., Anders, F., Enke, H., Minchev, I., Monari, G., Wyse, R. F. G., Bienayme, O., Bland-Hawthorn, J., Gibson, B. K., Navarro, J. F., Parker, Q., Reid, W., Seabroke, G. M., Siebert, A.
Publikováno v:
A&A 644, A168 (2020)
In the context of large spectroscopic surveys of stars, data-driven methods are key in deducing physical parameters for millions of spectra in a short time. Convolutional neural networks (CNNs) enable us to connect observables (e.g. spectra, stellar
Externí odkaz:
http://arxiv.org/abs/2004.12666
Autor:
Youakim, K., Starkenburg, E., Martin, N. F., Matijevic, G., Aguado, D. S., Prieto, C. Allende, Arentsen, A., Bonifacio, P., Carlberg, R. G., Hernández, J. I. González, Hill, V., Kordopatis, G., Lardo, C., Navarro, J. F., Jablonka, P., Janssen, R. Sánchez, Sestito, F., Thomas, G. F.
The Pristine survey uses narrow-band photometry to derive precise metallicities down to the extremely metal-poor regime ([Fe/H] < -3), and currently consists of over 4 million FGK-type stars over a sky area of $\sim 2~500\, \mathrm{deg}^2$. We focus
Externí odkaz:
http://arxiv.org/abs/2001.04988
Akademický článek
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Autor:
Koposov, S. E., Belokurov, V., Li, T. S., Mateu, C., Erkal, D., Grillmair, C. J., Hendel, D., Price-Whelan, A. M., Laporte, C. F. P., Hawkins, K., Sohn, S. T., del Pino, A., Evans, N. W., Slater, C. T., Kallivayalil, N., Navarro, J. F.
We use astrometry, broad-band photometry and variability information from the Data Release 2 of ESA's Gaia mission (GDR2) to identify members of the Orphan Stream (OS) across the whole sky. The stream is traced above and below the celestial equator a
Externí odkaz:
http://arxiv.org/abs/1812.08172
Autor:
Erkal, D., Belokurov, V., Laporte, C. F. P., Koposov, S. E., Li, T. S., Grillmair, C. J., Kallivayalil, N., Price-Whelan, A. M., Evans, N. W., Hawkins, K., Hendel, D., Mateu, C., Navarro, J. F., del Pino, A., Slater, C. T., Sohn, S. T.
In a companion paper by Koposov et al., RR Lyrae from \textit{Gaia} Data Release 2 are used to demonstrate that stars in the Orphan stream have velocity vectors significantly misaligned with the stream track, suggesting that it has received a large g
Externí odkaz:
http://arxiv.org/abs/1812.08192
Autor:
de Boer, T. J. L., Belokurov, V., Koposov, S. E., Ferrarese, L., Erkal, D., Cote, P., Navarro, J. F.
Using deep photometric data from CFHT/Megacam, we study the morphology and density of the GD-1 stream, one of the longest and coldest stellar streams in the Milky Way. Our deep data recovers the lower main sequence of the stream with unprecedented qu
Externí odkaz:
http://arxiv.org/abs/1801.08948