Zobrazeno 1 - 10
of 713
pro vyhledávání: '"Aguirre, V."'
Publikováno v:
A&A 648, L5 (2021)
In the past, the cumulative metallicity distribution function (CMDF) turned out as a useful tool to constrain the accretion history of various components of the Milky Way. In this Letter, by means of analytical, leaky-box chemical evolution models (i
Externí odkaz:
http://arxiv.org/abs/2103.10965
Autor:
Spitoni, E., Verma, K., Aguirre, V. Silva, Vincenzo, F., Matteucci, F., Vaičekauskaitė, B., Palla, M., Grisoni, V., Calura, F.
Publikováno v:
A&A 647, A73 (2021)
The analysis of the APOGEE DR16 data suggests the existence of a clear distinction between two sequences of disc stars at different Galactocentric distances in the [$\alpha$/Fe] vs. [Fe/H] abundance ratio space: the so-called high-$\alpha$ sequence,
Externí odkaz:
http://arxiv.org/abs/2101.08803
Autor:
Pietrinferni, A., Hidalgo, S. L., Cassisi, S., Salaris, M., Savino, A., Mucciarelli, A., Verma, D., Aguirre, V. Silva, Aparicio, A., Ferguson, J.
This is the second paper of a series devoted to present an updated release of the BaSTI ( a Bag of Stellar Tracks and Isochrones) stellar model and isochrone library. Following the publication of the updated solar scaled library, here we present the
Externí odkaz:
http://arxiv.org/abs/2012.10085
Autor:
Nissen, P. E., Christensen-Dalsgaard, J., Mosumgaard, J. R., Aguirre, V. Silva, Spitoni, E., Verma., K.
Publikováno v:
A&A 640, A81 (2020)
HARPS spectra with signal-to-noise ratios S/N > 600 at 6000 A were analysed with MARCS model atmospheres to obtain 1D LTE abundances of C, O, Na, Mg, Al, Si, Ca, Ti, Cr, Fe, Ni, Sr, and Y for 72 nearby solar-type stars with metallicities in the range
Externí odkaz:
http://arxiv.org/abs/2006.06013
Publikováno v:
A&A 642, A113 (2020)
In their evolution, star-forming galaxies are known to follow scaling relations between some fundamental physical quantities, such as the mass-metallicity and the main sequence relations. We aim at studying the evolution of galaxies that, at a given
Externí odkaz:
http://arxiv.org/abs/2003.02347
Autor:
Christensen-Dalsgaard, J., Aguirre, V. Silva, Cassisi, S., Bertolami, M. Miller, Serenelli, A., Stello, D., Weiss, A., Angelou, G., Jiang, C., Lebreton, Y., Spada, F., Bellinger, E. P., Deheuvels, S., Ouazzani, R. M., Pietrinferni, A., Mosumgaard, J. R., Townsend, R. H. D., Battich, T., Bossini, D., Constantino, T., Eggenberger, P., Hekker, S., Mazumdar, A., Miglio, A., Nielsen, K. B., Salaris, M.
Context. The large quantity of high-quality asteroseismic data that obtained from space-based photometric missions and the accuracy of the resulting frequencies motivate a careful consideration of the accuracy of computed oscillation frequencies of s
Externí odkaz:
http://arxiv.org/abs/2002.02816
Autor:
Aguirre, V. Silva, Christensen-Dalsgaard, J., Cassisi, S., Bertolami, M. Miller, Serenelli, A. M., Stello, D., Weiss, A., Angelou, G., Jiang, C., Lebreton, Y., Spada, F., Bellinger, E. P., Deheuvels, S., Ouazzani, R. M., Pietrinferni, A., Mosumgaard, J. R., Townsend, R. H. D., Battich, T., Bossini, D., Constantino, T., Eggenberger, P., Hekker, S., Mazumdar, A., Miglio, A., Nielsen, K. B., Salaris, M.
Publikováno v:
A&A 635, A164 (2020)
(Abridged). We introduce the Aarhus Red Giants Challenge, a series of detailed comparisons between widely used stellar evolution and oscillation codes aiming at establishing the minimum level of uncertainties in properties of red giants arising solel
Externí odkaz:
http://arxiv.org/abs/1912.04909
Publikováno v:
A&A 635, A58 (2020)
With the wealth of information from large surveys and observational campaigns in the contemporary era, it is critical to properly exploit the data to constrain the parameters of Galactic chemical evolution models and quantify the associated uncertain
Externí odkaz:
http://arxiv.org/abs/1912.04312
Stellar magnetic activity decays over the main-sequence life of cool stars due to the stellar spin-down driven by magnetic braking. The evolution of chromospheric emission is well-studied for younger stars, but difficulties in determining the ages of
Externí odkaz:
http://arxiv.org/abs/1910.12557
Autor:
Santos, A. R. G., Campante, T. L., Chaplin, W. J., Cunha, M. S., van Saders, J. L., Karoff, C., Metcalfe, T. S., Mathur, S., Garcia, R. A., Lund, M. N., Kiefer, R., Aguirre, V. Silva, Davies, G. R., Howe, R., Elsworth, Y.
In the Sun, the properties of acoustic modes are sensitive to changes in the magnetic activity. In particular, mode frequencies are observed to increase with increasing activity level. Thanks to CoRoT and Kepler, such variations have been found in ot
Externí odkaz:
http://arxiv.org/abs/1908.02897