The ∆a photometric system.

Intro -- 1 Summary -- 2 The early history of the Δa photometricsystem -- 3 The diagnostic tools of the Δa photometricsystem -- 4 Other indices measuring the 5200˚A region -- 5 The variability of the Δa index -- 5.1 CP stars -- 5.2 Be/shell stars - The case of Pleione -- 5.3 Variable star detection via Δa photometry -- 6 Chemically Peculiar stars of the upper mainsequence -- 7 Other star groups interesting for the Δaphotometric system -- 7.1 Blue Stragglers -- 7.2 Herbig Ae/Be stars -- 7.3 Be/shell stars -- 7.4 B[e] stars -- 7.5 Evolved and Population II stars -- 8 An inspection of the wavelength regionfrom 4900 to 5700 ˚A -- 8.1 The 5200˚A flux depression -- 8.2 Features of Stars across the HRD -- 8.3 Features of Quasars -- 8.4 Features of Galaxies -- 9 Spectrophotometry of the 5200˚A regionfor peculiar and normal type stars -- 9.1 Data and reduction -- 9.2 Results -- 9.3 Known peculiar objects -- 9.4 Apparent normal-type objects -- 9.5 Conclusions -- 10 A catalogue of Δa measurements for Galacticfield stars -- 10.1 Selection, preparation, and homogenization ofthe data -- 11 The detection probability of the Δa systemfor Population I stars -- 11.1 The normal type objects -- 11.2 Outliers not included in RM09 -- 11.3 CP1 stars -- 11.4 CP2 stars -- 11.5 CP3 stars -- 11.6 CP4 stars -- 11.7 λ Bootis stars -- 11.8 Supergiants -- 11.9 Be/shell stars -- 11.10 Newly confirmed CP stars -- 11.11 Comparison with the Geneva Δ(V 1 − G) and Zindices -- 12 An empirical temperature calibration forthe Δa photometric system -- 12.1 The B-type stars -- 12.2 The A-type and mid F-type stars -- 13 Theoretical isochrones for the Δa photometricsystem -- 13.1 Models, data selection, and isochrone fitting -- 14 Synthetic Δa photometry -- 14.1 The normality line -- 14.2 The cool CP and λ Bootis stars -- 14.3 Individual models: parameter determination withobserved fluxes.

14.4 CP2 stars with 8500 K Teff 10000 K -- 14.5 Comparison of the synthetic and observed Δaphotometry for ten CP stars -- 14.6 Observational constraints -- 14.7 Microturbulence, abundances, and atomic data -- 14.8 Stratification and magnetic fields -- 14.9 Stellar model atmospheres with magnetic lineblanketing -- 15 Heuristic observational correlations forCP stars -- 16 Investigating the λ Bootis spectroscopicbinary hypothesis using Δa photometry -- 16.1 Modelling the spectroscopic binary systems -- 16.2 Results and Conclusions -- 17 The Δa observations of Galactic open clusters -- 17.1 The characteristics of open clusters -- 17.2 Photoelectric Δa observations of Galactic openclusters -- 17.3 CCD Δa observations of Galactic open clusters -- 17.4 The observation of Blue Stragglers in open clusters -- 17.5 Statistics of the observed open clusters -- 18 The first Δa observations of three Galacticglobular clusters -- 18.1 Target selection, observations and reduction -- 18.2 Discussion -- 19 The Δa observations within the LargeMagellanic Cloud -- 19.1 Target fields and observations -- 19.2 Reduction and calibration -- 19.3 The incidence of the apparent peculiar objects -- 19.4 The spectroscopic verification of one CP and Bestar -- 19.5 The (non-)variability of magnetic CP candidatesin the LMC -- 20 A case study of using Gunn g data toimprove Δa -- 21 The ALHAMBRA and COSMOS surveys -- 22 Conclusions and Outlook -- 23 References.

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Electronic reproduction. Ann Arbor, Michigan : ProQuest Ebook Central, 2024. Available via World Wide Web. Access may be limited to ProQuest Ebook Central affiliated libraries.