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New Optical and Near-Infrared Surface Brightness Fluctuations Models . II . Young and Intermediate Age Stellar Populations
| Content Provider | Semantic Scholar |
|---|---|
| Author | Raimondo Cantiello Capaccioli |
| Copyright Year | 2005 |
| Abstract | We present theoretical surface-brightness fluctuations (SBF) amplitudes for single–burst stellar populations of young and intermediate age (25 Myr ≤ t ≤ The fluctuation magnitudes and colors as expected in the Johnson–Cousins (UB-VRIJHK) photometric system are provided. We pay attention to the contribution of thermal–pulses asymptotic giant branch (TP–AGB) stars. The sensitivity of the predicted SBF to changes in the mass–loss scenario along the TP–AGB phase is examined. Below 0.6-1 Gyr both optical and NIR SBF models exhibit a strong dependence on age and mass loss. We also evaluate SBF amplitudes by using Monte Carlo techniques to reproduce the random variation in the number of stars experiencing bright and fast evolutionary phases (Red Giant Branch, AGB, TP–AGB). On this ground, we provide constraints upon the faintest integrated flux of real stellar populations required to derive reliable and meaningful SBF measurements. We analyze a technique for deriving SBF amplitudes of star clusters from the photometry of individual stars, and estimate the indetermination due to statistical effects, which may impinge on the procedure. The first optical SBF measurements for 11 Large Magellanic Cloud (LMC) star rich clusters-with age ranging from few Myr to several Gyr-are derived by using Hubble Space Telescope observations. The measurements are successfully compared to our SBF predictions, thus providing a good agreement with models of metallicity Z = 0.0001–0.01. Our results suggest that, for TP–AGB stars, a mass loss – 2 – as a power-law function of the star luminosity is required in order to properly reproduce the optical SBF data of the LMC clusters. Finally, near–infrared models have been compared to available data, thus showing the general trend is well fitted. We suggest how to overcome the general problem of SBF models in reproducing the details of the near–infrared SBF measurements of the Magellanic Cloud star clusters. |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | http://arxiv.org/pdf/astro-ph/0509020v1.pdf |
| Language | English |
| Access Restriction | Open |
| Subject Keyword | Balbiani Body Color GUCY2C protein, human Leucaena pulverulenta Little man computer Lymphoma, Large-Cell, Follicular Magellanic Catalogue of Stars Mass Spectrometry Monte Carlo method Photometry Population Probability amplitude Quantum fluctuation Seizures Sensorineural Hearing Loss (disorder) Stars, Celestial Stellar (payment network) Stellar classification UB-tree brightness |
| Content Type | Text |
| Resource Type | Article |
