Zobrazeno 1 - 10
of 80
pro vyhledávání: '"Ferguson, Jason W."'
Autor:
Chen, Xunzhou, Ge, Zhishuai, Chen, Yuqin, Bi, Shaolan, Yu, Jie, Yang, Wuming, Ferguson, Jason W., Wu, Yaqian, Li, Yaguang
Main sequence turn-off (MSTO) stars are good tracers of Galactic populations since their ages can be reliably estimated from atmospheric parameters. Based on the GALAH survey, we use the Yale Rotation Evolution Code to determine ages of 2926 MSTO sta
Externí odkaz:
http://arxiv.org/abs/2203.06083
Autor:
Magg, Ekaterina, Bergemann, Maria, Serenelli, Aldo, Bautista, Manuel, Plez, Bertrand, Heiter, Ulrike, Gerber, Jeffrey M., Ludwig, Hans-Günter, Basu, Sarbani, Ferguson, Jason W., Gallego, Helena Carvajal, Gamrath, Sébastien, Palmeri, Patrick, Quinet, Pascal
Publikováno v:
A&A 661, A140 (2022)
The chemical composition of the Sun is requested in the context of various studies in astrophysics, among them in the calculation of the standard solar models (SSMs), which describe the evolution of the Sun from the pre-main-sequence to its present a
Externí odkaz:
http://arxiv.org/abs/2203.02255
New, high-resolution MARCS synthetic spectra have been calculated for more than a dozen mixtures of the metals allowing, in turn, for variations in C:N:O, [CNO/Fe], and enhanced abundances of C, O, Mg, and Si. Bolometric Corrections (BCs) for many of
Externí odkaz:
http://arxiv.org/abs/2111.02620
Autor:
Montalbán, Josefina, Mackereth, John Ted, Miglio, Andrea, Vincenzo, Fiorenzo, Chiappini, Cristina, Buldgen, Gaël, Mosser, Benoît, Noels, Arlette, Scuflaire, Richard, Vrard, Mathieu, Willett, Emma, Davies, Guy R., Hall, Oliver, Nielsen, Martin Bo, Khan, Saniya, Rendle, Ben M., van Rossem, Walter E., Ferguson, Jason W., Chaplin, William J.
The standard cosmological model ($\Lambda$-CDM) predicts that galaxies are built through hierarchical assembly on cosmological timescales$^{1,2}$. The Milky Way, like other disc galaxies, underwent violent mergers and accretion of small satellite gal
Externí odkaz:
http://arxiv.org/abs/2006.01783
Models of core accretion assume that in the radiative zones of accreting gas envelopes, radiation diffuses. But super-Earths/sub-Neptunes (1-4$R_\oplus$, 2-20$M_\oplus$) point to formation conditions that are optically thin: their modest gas masses a
Externí odkaz:
http://arxiv.org/abs/1710.02604
We present a new set of horizontal-branch (HB) models computed with the MESA stellar evolution code. The models adopt $\alpha$-enhanced \cite{ags09} metals mixtures and include the gravitational settling of He. They are used in our HB population synt
Externí odkaz:
http://arxiv.org/abs/1706.05454
Publikováno v:
2016ApJ...826..155B
The individual characteristics of C, N, O, Na, Mg, Al, Si, and Fe on isochrones have been investigated in this study. Stellar models have been constructed for various mixtures in which the content of each element is changed up to the extreme value re
Externí odkaz:
http://arxiv.org/abs/1608.05078
Canonical grids of stellar evolutionary sequences have been computed for the helium mass-fraction abundances $Y = 0.25$, $0.29$, and $0.33$, and for iron abundances that vary from $-2.4$ to $+0.4$ (in 0.2 dex increments) when [$\alpha$/Fe] $= +0.4$,
Externí odkaz:
http://arxiv.org/abs/1409.1283
Autor:
VandenBerg, Don A., Bergbusch, Peter A., Dotter, Aaron, Ferguson, Jason W., Michaud, Georges, Richer, Jacques, Proffitt, Charles
Recent work has shown that most globular clusters have at least two chemically distinct components, as well as cluster-to-cluster differences in the mean [O/Fe], [Mg/Fe], and [Si/Fe] ratios at similar [Fe/H] values. In order to investigate the implic
Externí odkaz:
http://arxiv.org/abs/1206.1820
Publikováno v:
Astrophys.J.705:L123-L127,2009
We construct updated solar models with different sets of solar abundances, including the most recent determinations by Asplund et al. (2009). The latter work predicts a larger ($\sim 10%$) solar metallicity compared to previous measurements by the sa
Externí odkaz:
http://arxiv.org/abs/0909.2668