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

العناوين الأخرى

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

مقدم أطروحة جامعية

Dali, Hani M.

مشرف أطروحة جامعية

Sabat, Hanna Antoine
Hajjar, Roger

الجامعة

جامعة آل البيت

الكلية

معهد الفلك و علوم الفضاء

دولة الجامعة

الأردن

الدرجة العلمية

ماجستير

تاريخ الدرجة العلمية

2013

الملخص الإنجليزي

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.

التخصصات الرئيسية

الفلك و علومه

الموضوعات

عدد الصفحات

86

قائمة المحتويات

Table of contents.

Abstract.

Introduction.

Chapter One : Theory and definitions.

Chapter Two : Methods and observations.

Chapter Three : General results of my study.

Chapter Four : Conclusions and future prospects.

References.

نمط استشهاد جمعية علماء النفس الأمريكية (APA)

Dali, Hani M.. (2013). The mechanism of the environment around some Be stars by studying their fine spectral changes. (Master's theses Theses and Dissertations Master). Al albayt University, Jordan
https://search.emarefa.net/detail/BIM-420821

نمط استشهاد الجمعية الأمريكية للغات الحديثة (MLA)

Dali, Hani M.. The mechanism of the environment around some Be stars by studying their fine spectral changes. (Master's theses Theses and Dissertations Master). Al albayt University. (2013).
https://search.emarefa.net/detail/BIM-420821

نمط استشهاد الجمعية الطبية الأمريكية (AMA)

Dali, Hani M.. (2013). The mechanism of the environment around some Be stars by studying their fine spectral changes. (Master's theses Theses and Dissertations Master). Al albayt University, Jordan
https://search.emarefa.net/detail/BIM-420821

لغة النص

الإنجليزية

نوع البيانات

رسائل جامعية

رقم السجل

BIM-420821