Complex study of the binary stellar system HD 25811

Dissertant

al-Thyabat, Ahmad Muhammad

Thesis advisor

Widyan, Hatim Salih
al-Wardah, Mashhur Ahmad

University

Al albayt University

Faculty

Faculty of Sciences

Department

Department of Physics

University Country

Jordan

Degree

Master

Degree Date

2013

English Abstract

COMPlEX STUDY OF THE BINARY STELLAR SYSTEM HD 25811 By Ahmad Mohmmad Al-thyabat.

Master of Physics, Al al-Bayt University, ( Supervisor: Prof. Hatem Saleh Widyan and Dr.

Mashhoor Ahmad Al-Wardat).

Atmospheric modeling of the components of the stellar binary system HD25811 was used to estimate their individual physical and geometrical parameters.

The model atmospheres were constructed using a grid of Kurucz solar metalicity blanketed models, and used to compute a synthetic spectral energy distribution for each component separately, and hence for the entire system.

The entire observational spectral energy distribution of the systems was used as a reference for the comparison with the synthetic ones.

We used the feedback modi_ed parameters and iteration method to get the best _t between synthetic and observational spectral energy distributions. The input parameters of the atmospheric modeling of the individual components, which led to the best _t, represent adequately enough the parameters of the system. These parameters were derived as: Ta eff = 7000 _ 100 K, Tb eff = 6850 _ 100 K, log ga = 4:30 _ 0:08, log gb = 4:30 _ 0:09, Ra = 1:88 _ 0:12R_, Rb = 1:78 _ 0:13R_, and their spectral types were concluded as F1 & F2.

Also, a new parallax of the system was estimated as _ = 5:084 mas (d = 196:7pc).

Finally the formation and evolution of the system were discussed.

Main Subjects

Physics

No. of Pages

80

Table of Contents

• APA
• MLA
• AMA

Language

English

Data Type

Arab Theses

Record ID

BIM-416240