Matches in SemOpenAlex for { <https://semopenalex.org/work/W2604037114> ?p ?o ?g. }
- W2604037114 endingPage "72" @default.
- W2604037114 startingPage "72" @default.
- W2604037114 abstract "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] $= +0.4$, or for the ranges $-2.0 le$ [Fe/H] $le +0.6$, $-1.8 le$ [Fe/H] $le +0.6$ when [$alpha$/Fe] $= 0.0$ and $-0.4$, respectively. The grids, which consist of tracks for masses from $0.12 {{cal M}_odot}$ to $1.1$-$1.5 {{cal M}_odot}$ (depending on the metallicity) are based on up-to-date physics, including the gravitational settling of helium (but not metals diffusion). Interpolation software is provided to generate isochrones for arbitrary ages between $approx 5$ and $15$ Gyr and any values of $Y$, [$alpha$/Fe], and [Fe/H] within the aforementioned ranges. Comparisons of isochrones with published color-magnitude diagrams (CMDs) for the open clusters M67 ([Fe/H] $approx 0.0$) and NGC 6791 ([Fe/H] $approx 0.3$) and for four of the metal-poor globular clusters (47 Tuc, M3, M5, and M92) indicate that the models for the observed metallicities do a reasonably good job of reproducing the locations and slopes of the cluster main sequences and giant branches. The same conclusion is reached from a consideration of plots of nearby subdwarfs that have accurate Hipparcos parallaxes and metallicities in the range $-2.0 le$ [Fe/H] $le -1.0$ on various CMDs and on the ($log T_{rm eff},,M_V$)-diagram. A relatively hot temperature scale similar to that derived in recent calibrations of the infrared flux method is favored by both the isochrones and the adopted color transformations, which are based on the latest MARCS model atmospheres." @default.
- W2604037114 created "2017-04-07" @default.
- W2604037114 creator A5035340880 @default.
- W2604037114 creator A5044876679 @default.
- W2604037114 creator A5061832988 @default.
- W2604037114 creator A5063689359 @default.
- W2604037114 date "2014-09-24" @default.
- W2604037114 modified "2023-09-26" @default.
- W2604037114 title "ISOCHRONES FOR OLD (>5 GYR) STARS AND STELLAR POPULATIONS. I. MODELS FOR –2.4 ⩽ [Fe/H] ⩽+0.6, 0.25 ⩽<i>Y</i>⩽ 0.33, AND –0.4 ⩽ [α/Fe] ⩽+0.4" @default.
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