Theoretical Uncertainties in Red Giant Branch Evolution: The Red Giant Branch Bump

@article{Bjork2003TheoreticalUI,
  title={Theoretical Uncertainties in Red Giant Branch Evolution: The Red Giant Branch Bump},
  author={Stephanie R. Bjork and Brian Chaboyer},
  journal={The Astrophysical Journal},
  year={2003},
  volume={641},
  pages={1102-1112}
}
A Monte Carlo simulation exploring uncertainties in standard stellar evolution theory on the red giant branch of metal-poor globular clusters has been conducted. Confidence limits are derived on the absolute V-band magnitude of the bump in the red giant branch luminosity function (MV,b) and the excess number of stars in the bump, Rb. The analysis takes into account uncertainties in the primordial helium abundance, abundance of ?-capture elements, radiative and conductive opacities, nuclear… 

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References

SHOWING 1-10 OF 51 REFERENCES
The Red Giant Branch luminosity function bump
We present observational estimates of the magnitude difference between the luminosity function red giant branch bump and the horizontal branch (∆F555W bump ), and of star counts in the bump region
Red giant branch stars: the theoretical framework
Theoretical predictions of red giant branch stars' effective temperatures, colors, luminosities, and surface chemical abundances are a necessary tool for the astrophysical interpretation of the
The effect of diffusion on the red giant luminosity function ‘bump’
This paper investigates the effect of microscopic diffusion of helium and heavy elements on the location of the Red Giant Branch Luminosity Function Bump in Population II stellar models. To this aim
Core mass at the helium flash from observations and a new bound on neutrino electromagnetic properties
Existing measurements of the bolometric magnitudes of the brightest red giants in 26 globular clusters are used to determine the brightness difference between the tip of the red giant branch (on
A critical investigation on the discrepancy between the observational and the theoretical red giant luminosity function ‘bump’
New theoretical evaluations of the RGB luminosity function 'bump' and the ZAHB luminosity covering the range of metallicities typical of galactic globular cluster are presented. The variation of the
Theoretical Uncertainties in the Subgiant Mass-Age Relation and the Absolute Age of ω Centauri
The theoretical uncertainties in the calibration of the relationship between the subgiant mass and age in metal-poor stars are investigated using a Monte Carlo approach. Assuming that the mass and
Comparison between Predicted and Empirical ΔVHBbump in Galactic Globular Clusters
We present observational estimates of ΔV in a sample of 28 galactic globular clusters (GGCs) observed by the Hubble Space Telescope. The photometric accuracy and the sizable number of stars measured
The Unusual Luminosity Function of the Globular Cluster M10
We present the I-band luminosity function of the differentially reddened globular cluster M10. We combine photometric analysis derived from wide-field (23' × 23') images that include the outer
Heavy element diffusion in metal poor stars
Stellar evolution models that include the effect of helium and heavy-element diffusion have been calculated for initial iron abundances of [Fe/H] = -2.3, -2.1, -1.9, and -1.7. These models were
The Luminosity function and color - magnitude diagram of the globular cluster M12
In this paper we present the V and I luminosity functions and color-magnitude diagrams derived from wide-field (23' ? 23') BVI photometry of the intermediate-metallicity ([Fe/H] ~ -1.3) Galactic
...
1
2
3
4
5
...