Now showing items 1-6 of 6

• #### Chronologically dating the early assembly of the Milky Way ﻿

(Springer Nature, 2021-05-17)
The standard cosmological model predicts that galaxies are built through hierarchical assembly on cosmological timescales$^{1,2}.$ The Milky Way, like other disk galaxies, underwent violent mergers and accretion of small ...
• #### Constraints on the distance moduli, helium, and metal abundances, and ages of globular clusters from their RR Lyrae and non-variable horizontal branch stars. II. multiple stellar populations in 47 Tuc, M3, and M13 ﻿

(IOP Publishing, 2017-11-10)
We present a new set of horizontal branch (HB) models computed with the MESA stellar evolution code. The models adopt alpha-enhanced Asplund et al. metal mixtures and include the gravitational settling of He. They are used ...
• #### The effects of individual metal contents on isochrones for C, N, O, Na, Mg, Al, Si, and Fe ﻿

(IOP Publishing, 2016-07-28)
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 ...
• #### From the color-magnitude diagram of omega centauri and (super-) asymptotic giant branch stellar models to a galactic plane passage gas purging chemical evolution scenario ﻿

(IOP Publishing, 2012-10-01)
We have investigated the color-magnitude diagram of omega Centauri and find that the blue main sequence (bMS) can be reproduced only by models that have a helium abundance in the range Y = 0.35-0.40. To explain the faint ...
• #### Photometric properties of stellar populations in Galactic globular clusters: the role of the Mg-Al anticorrelation ﻿

(EDP Sciences S A, 2013-06)
We have computed low-mass stellar models and synthetic spectra for an initial chemical composition that includes the full C-N, O-Na, and Mg-Al abundance anticorrelations observed in second-generation stars belonging to a ...
• #### Stellar models of multiple populations in globular clusters - I. The main sequence of NGC 6752 ﻿

(Oxford University Press, 2015-01-11)
We present stellar atmosphere and evolution models of main-sequence stars in two stellar populations of the Galactic globular cluster NGC 6752. These populations represent the two extremes of light-element abundance ...