Zobrazeno 1 - 10
of 78
pro vyhledávání: '"Youakim K."'
Rapidly growing datasets from stellar spectroscopic surveys are providing unprecedented opportunities to analyse the chemical evolution history of our Galaxy. However, spectral analysis requires accurate modelling of synthetic stellar spectra for lat
Externí odkaz:
http://arxiv.org/abs/2403.19304
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:
Mallinson, J. W. E., Lind, K., Amarsi, A. M., Barklem, P. S., Grumer, J., Belyaev, A. K., Youakim, K.
Publikováno v:
A&A 668, A103 (2022)
The titanium abundances of late-type stars are important tracers of Galactic formation history. However, abundances inferred from Ti I and Ti II lines can be in stark disagreement in very metal-poor giants. Departures from local thermodynamic equilib
Externí odkaz:
http://arxiv.org/abs/2210.08880
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
Autor:
Carrillo, I., Minchev, I., Steinmetz, M., Monari, G., Laporte, C. F. P., Anders, F., Queiroz, A. B. A., Chiappini, C., Khalatyan, A., Martig, M., McMillan, P., Santiago, B. X., Youakim, K.
We use Gaia DR2 astrometric and line-of-sight velocity information combined with two sets of distances obtained with a Bayesian inference method to study the 3D velocity distribution in the Milky Way disc. We search for variations in all Galactocentr
Externí odkaz:
http://arxiv.org/abs/1903.01493
Autor:
Youakim, K., Starkenburg, E., Aguado, D. S., Martin, N. F., Fouesneau, M., Hernández, J. I. González, Prieto, C. Allende, Bonifacio, P., Gentile, M., Kielty, C., Côté, P., Jablonka, P., McConnachie, A., Janssen, R. Sánchez, Tolstoy, E., Venn, K.
The Pristine survey is a narrow-band, photometric survey focused around the wavelength region of the Ca II H & K absorption lines, designed to efficiently search for extremely metal-poor stars. In this work, we use the first results of a medium-resol
Externí odkaz:
http://arxiv.org/abs/1708.01264
Autor:
Caffau, E., Bonifacio, P., Starkenburg, E., Martin, N., Youakim, K., Henden, A. A., Hernandez, J. I. Gonzalez, Aguado, D. S., Prieto, C. Allende, Venn, K., Jablonka, P.
Extremely metal-poor (EMP) stars are old objects formed in the first Gyr of the Universe. They are rare and, to select them, the most successful strategy has been to build on large and low-resolution spectroscopic surveys. The combination of narrow-
Externí odkaz:
http://arxiv.org/abs/1705.10280
Autor:
Marchetti, T., Rossi, E. M., Kordopatis, G., Brown, A. G. A., Rimoldi, A., Starkenburg, E., Youakim, K., Ashley, R.
The paucity of hypervelocity stars (HVSs) known to date has severely hampered their potential to investigate the stellar population of the Galactic Centre and the Galactic Potential. The first Gaia data release gives an opportunity to increase the cu
Externí odkaz:
http://arxiv.org/abs/1704.07990
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