The mechanism of the environment around some Be stars by studying their fine spectral changes

Other Title(s)

ألية المادة المحيطة ببعض نجوم Be من خلال دراسة تغيراتها الطيفية الدقيقة

Dissertant

Dali, Hani M.

Thesis advisor

Sabat, Hanna Antoine
Hajjar, Roger

University

Al albayt University

Faculty

Institute of Astronomy and Space Sciences

University Country

Jordan

Degree

Master

Degree Date

2013

English Abstract

We present a study about three Be stars to compare the fine changes -if any- in their Hα emission during two nights of observations, to which we added other observations taken from the BeSS database which is dedicated to collect spectroscopic data of Be stars. Our spectra were obtained using a Meade 14” telescope with an LHIRES III spectrograph along with an SBIG ST-2k Dual CCD camera with two acquisition and control softwares the Sky 6 Professional and CCD Software.

All raw spectra obtained were reduced, processed and analyzed using NOAO’s IRAF under Ubuntu - Linux.

The analysis of obtained data in many ways, observed and from the BeSS database was done using various approaches.

We calculated the value of projected velocity Vsini for κ-Dra, 4-Her & θCrB, and searched for correlations of various parameters by plotting time vs.

R/V ratio , time vs.

Equivalent Width and time versus Vr. We found some kind of periodicity in the profiles of θCrB star, which might need better and sequenced observations.

For the other two stars, profiles are normal and might need long time monitoring to detect some valuable changes. Finally, we put some recommendations for pursuing this study and generalize it for other Be stars.

Main Subjects

Astronomy

Topics

• Stars

No. of Pages

86

Table of Contents

• APA
• MLA
• AMA

Language

English

Data Type

Arab Theses

Record ID

BIM-420821