Zobrazeno 1 - 10
of 195
pro vyhledávání: '"Guiglion, G."'
Autor:
Khalatyan, A., Anders, F., Chiappini, C., Queiroz, A. B. A., Nepal, S., Ponte, M. dal, Jordi, C., Guiglion, G., Valentini, M., Elipe, G. Torralba, Steinmetz, M., Pantaleoni-González, M., Malhotra, S., Jiménez-Arranz, Ó., Enke, H., Casamiquela, L., Ardèvol, J.
We explore the feasibility of using machine-learning regression as a method of extracting basic stellar parameters and line-of-sight extinctions, given spectro-photometric data. To this end, we build a stable gradient-boosted random-forest regressor
Externí odkaz:
http://arxiv.org/abs/2407.06963
Autor:
Worley, C. C., Smiljanic, R., Magrini, L., Frasca, A., Franciosini, E., Montes, D., Feuillet, D. K., Tabernero, H. M., Hernández, J. I. González, Villanova, S., Mikolaitis, Š., Lind, K., Tautvaišienė, G., Casey, A. R., Korn, A. J., Bonifacio, P., Soubiran, C., Caffau, E., Guiglion, G., Merle, T., Hourihane, A., Gonneau, A., François, P., Randich, S., Gilmore, G., Lewis, J. R., Murphy, D. N. A., Jeffries, R. D., Koposov, S. E., Blomme, R., Lanzafame, A. C., Bensby, T., Bragaglia, A., Alfaro, E. J., Walton, N. A., Vallenari, A., Prusti, T., Biazzo, K., Jofré, P., Zaggia, S., Heiter, U., Marfil, E., Jiménez-Esteban, F., Albarrán, M. L. Gutiérrez, Morbidelli, L.
The Gaia-ESO Survey is an European Southern Observatory (ESO) public spectroscopic survey that targeted $10^5$ stars in the Milky Way covering the major populations of the disk, bulge and halo. The observations were made using FLAMES on the VLT obtai
Externí odkaz:
http://arxiv.org/abs/2402.06076
Recently Lian et al. (2023), thanks to Gaia-ESO data, studied the chemical evolution of neutron-capture elements in the regime [Fe/H]>-1. We aim here to complement this study down to [Fe/H]=-3, and focus on Ba, Y, Sr, and abundance ratios of [Ba/Y] a
Externí odkaz:
http://arxiv.org/abs/2311.05459
Autor:
Guiglion, G., Nepal, S., Chiappini, C., Khoperskov, S., Traven, G., Queiroz, A. B. A., Steinmetz, M., Valentini, M., Fournier, Y., Vallenari, A., Youakim, K., Bergemann, M., Mészáros, S., Lucatello, S., Sordo, R., Fabbro, S., Minchev, I., Tautvaišienė, G., Mikolaitis, Š., Montalbán, J.
In June 2022, Gaia DR3 has provided the astronomy community with about one million spectra from the Radial Velocity Spectrometer (RVS) covering the CaII triplet region. However, one-third of the published spectra have 15
Externí odkaz:
http://arxiv.org/abs/2306.05086
Autor:
Jeffries, R. D., Jackson, R. J., Wright, Nicholas J., Weaver, G., Gilmore, G., Randich, S., Bragaglia, A., Korn, A. J., Smiljanic, R., Biazzo, K., Casey, A. R., Frasca, A., Gonneau, A., Guiglion, G., Morbidelli, L., Prisinzano, L., Sacco, G. G., Tautvaišienė, G., Worley, C. C., Zaggia, S.
We present an empirical model of age-dependent photospheric lithium depletion, calibrated using a large, homogeneously-analysed sample of 6200 stars in 52 open clusters, with ages from 2--6000 Myr and $-0.3<{\rm [Fe/H}]<0.2$, observed in the Gaia-ESO
Externí odkaz:
http://arxiv.org/abs/2304.12197
Autor:
Hourihane, A., Francois, P., Worley, C. C., Magrini, L., Gonneau, A., Casey, A. R., Gilmore, G., Randich, S., Sacco, G. G., Recio-Blanco, A., Korn, A. J., Prieto, C. Allende, Smiljanic, R., Blomme, R., Bragaglia, A., Walton, N. A., Van Eck, S., Bensby, T., Lanzafame, A, Frasca, A., Franciosini, E., Damiani, F., Lind, K., Bergemann, M., Bonifacio, P., Hill, V., Lobel, A., Montes, D., Feuillet, D. K., Tautvaisene, G., Guiglion, G., Tabernero, H. M., Hernandez, J. I. Gonzalez, Gebran, M., Van der Swaelmen, M., Mikolaitis, Daflon, S., Merle, T., Morel, T., Lewis, J. R., Solares, E. A. Gonzalez, Murphy, D. N. A., Jeffries, R. D., Jackson, R. J., Feltzing, S., Prusti, T., Carraro, G., Biazzo, K., Prisinzano, L., Jofre, P., Zaggia, S., Drazdauskas, A., Stonkute, E., Marfil, E., Jimenez-Esteban, F., Mahy, L., Albarran, M. L. Gutierrez, Berlanas, S. R., Santos, W., Morbidelli, L., Spina, L., Minkeviciute, R.
Publikováno v:
A&A 676, A129 (2023)
The Gaia-ESO Survey is a public spectroscopic survey that has targeted $\gtrsim10^5$ stars covering all major components of the Milky Way from the end of 2011 to 2018, delivering its public final release in May 2022. Unlike other spectroscopic survey
Externí odkaz:
http://arxiv.org/abs/2304.07720
Autor:
Dantas, M. L. L., Guiglion, G., Smiljanic, R., Romano, D., Magrini, L., Bensby, T., Chiappini, C., Franciosini, E., Nepal, S., Tautvaišienė, G., Gilmore, G., Randich, S., Lanzafame, A. C., Heiter, U., Morbidelli, L., Prisinzano, L., Zaggia, S.
Publikováno v:
A&A 668, L7 (2022)
We test a scenario in which radial migration could affect the Li abundance pattern of dwarf stars in the solar neighbourhood. This may confirm that the Li abundance in these stars can not serve as a probe for the Li abundance in the interstellar medi
Externí odkaz:
http://arxiv.org/abs/2211.14132
Autor:
Dantas, M. L. L., Smiljanic, R., Boesso, R., Rocha-Pinto, H. J., Magrini, L., Guiglion, G., Tautvaišienė, G., Gilmore, G., Randich, S., Bensby, T., Bragaglia, A., Bergemann, M., Carraro, G., Jofré, P., Zaggia, S.
Publikováno v:
A&A 669, A96 (2023)
We report the identification of a set of old super metal-rich dwarf stars with orbits of low eccentricity that reach a maximum height from the Galactic plane between ~0.5-1.5 kpc. We discuss their properties to understand their origins. We use data f
Externí odkaz:
http://arxiv.org/abs/2210.08510
Autor:
Franciosini, E., Randich, S., de Laverny, P., Biazzo, K., Feuillet, D. K., Frasca, A., Lind, K., Prisinzano, L., Tautvaišienė, G., Lanzafame, A. C., Smiljanic, R., Gonneau, A., Magrini, L., Pancino, E., Guiglion, G., Sacco, G. G., Sanna, N., Gilmore, G., Bonifacio, P., Jeffries, R. D., Micela, G., Prusti, T., Alfaro, E. J., Bensby, T., Bragaglia, A., François, P., Korn, A. J., Van Eck, S., Bayo, A., Bergemann, M., Carraro, G., Heiter, U., Hourihane, A., Jofré, P., Lewis, J., Martayan, C., Monaco, L., Morbidelli, L., Worley, C. C., Zaggia, S.
Publikováno v:
A&A 668, A49 (2022)
The Gaia-ESO Survey (GES) is a large public spectroscopic survey that was carried out using the multi-object FLAMES spectrograph at the Very Large Telescope. The survey provides accurate radial velocities, stellar parameters, and elemental abundances
Externí odkaz:
http://arxiv.org/abs/2210.04721
Autor:
Nepal, S., Guiglion, G., de Jong, R. S., Valentini, M., Chiappini, C., Steinmetz, M., Ambrosch, M., Pancino, E., Jeffries, R. D., Bensby, T., Romano, D., Smiljanic, R., Dantas, M. L. L., Gilmore, G., Randich, S., Bayo, A., Bergemann, M., Franciosini, E., Jiménez-Esteban, F., Jofré, P., Morbidelli, L., Sacco, G. G., Tautvaišienė, G., Zaggia, S.
Publikováno v:
A&A 671, A61 (2023)
With its origin coming from several sources (Big Bang, stars, cosmic rays) and given its strong depletion during its stellar lifetime, the lithium element is of great interest as its chemical evolution in the Milky Way is not well understood at prese
Externí odkaz:
http://arxiv.org/abs/2208.08874