Chapter 1
Introduction

Chapter 2
Solar TErrestrial RElations Observatory (STEREO)

Chapter 3
ANALysıs TECHNIQUES of NUMERICAL DATA

Chapter 4
Frequency ANALYSeS of synthetic lıght curves

Chapter 5
PerIOD evolutıon of some chemically peculıar STARS

Chapter 6
Photometric and spectroscopic evolution of some brıght be-stars: the relatıon between non-radıal pulsatıons and dısk structures