Unit:
Department of PhysicsLibrary of the School of Science
Author:
Margetis Konstantinos
Supervisors info:
Κοσμάς Γαζέας, Λέκτορας Τμήμα Φυσικής ΕΚΠΑ
Original Title:
HV Aqr: Ένα εξωτικό σύστημα σε επαφή
Translated title:
HV Aqr: An exotic contact binary system
Summary:
The double star systems or binary star is an important subject for the today astrophysics, because of the use on research and experimental work. Through their observation is impossible to calculate the absolute parameters of the stars (e.g. mass, radius, luminosity) and determinate various mechanisms that can affect the orbital period of the system (e.g. exchange mass between the stars, existence of a third star).
The present work focuses on the study of a binary star called HV Aquarii. In the first chapter there is an introduction to the categories of variable stars and to the categories in which the eclipsing variables are classified. Their geometry is described in detail and their variables are defined. The categories of binary stars are also described depending on the Roche geometry but also on the shape of their light curve. Following is the instruments and observation techniques used to perform the photometry. The third chapter calculates the minimum times, the astronomical journal and the phase diagram for the HV Aqr system. Using the Wilson - Devinney algorithm, the absolute physical and orbital parameters of the system were calculated. The fourth chapter presents the O-C diagram and its analysis with the help of a computer code. Finally, in the fifth chapter, conclusions are drawn about the system
Main subject category:
Science
Keywords:
HV Aquarii, eclipsing binary stellar system, contact binary stellar system, EW type, photometry, Wilson - Devinney code, O-C diagram
