Red giant branch bump star counts in data and stellar models
نویسندگان
چکیده
منابع مشابه
The Red Giant Branch Bump
We present a comparison between theoretical models and the observed magnitude difference between the horizontal branch and the red giant branch bump for a sample of 53 clusters. We find a general agreement, though some discrepancy is still present at the two extremes of the metallicity range of globular clusters. 1. The red giant branch bump The ‘bump’ is an intrinsic feature of the red giant b...
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Color-magnitude diagrams of globular clusters often exhibit a prominent horizontal branch (HB) and may also show features such as the red giant branch (RGB) bump and the asymptotic giant branch (AGB) bump. Stellar evolution theory predicts that the luminosities of these features will depend on the metallicity and age of the cluster. We calculate theoretical lines of 2 to 12 Gyr constant age RGB...
متن کاملThe 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 HB ), and of star counts in the bump region (Rbump), for a sample of 54 Galactic globular clusters observed by the HST. The large sample of stars resolved in each cluster, and the high photometric accuracy of the data allowed us to detect the bum...
متن کاملUncertainties in Red Giant Branch Evolution : The Red Giant Branch Bump Stephan
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 primord...
متن کاملInvestigating The Consistency of Stellar Evolution Models with Globular Cluster Observations via the Red Giant Branch Bump
Synthetic RGBB magnitudes are generated with the most recent theoretical stellar evolution models computed with the Dartmouth Stellar Evolution Program (DSEP) code. They are compared to the observational work of Nataf et al., who present RGBB magnitudes for 72 globular clusters. A DSEP model using a chemical composition with enhanced α capture [α/Fe] = +0.4 and an age of 13 Gyr shows agreement ...
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ژورنال
عنوان ژورنال: Monthly Notices of the Royal Astronomical Society
سال: 2014
ISSN: 1365-2966,0035-8711
DOI: 10.1093/mnras/stu1974