Main Page
Deanship
The Dean
Dean's Word
Curriculum Vitae
Contact the Dean
Vision and Mission
Organizational Structure
Vice- Deanship
Vice- Dean
KAU Graduate Studies
Research Services & Courses
Research Services Unit
Important Research for Society
Deanship's Services
FAQs
Research
Staff Directory
Files
Favorite Websites
Deanship Access Map
Graduate Studies Awards
Deanship's Staff
Staff Directory
Files
Researches
Contact us
عربي
English
About
Admission
Academic
Research and Innovations
University Life
E-Services
Search
Deanship of Graduate Studies
Document Details
Document Type
:
Thesis
Document Title
:
DISTANCE STUDY FOR PLANETARY NEBULAE USING ASTROMETRIC DATA OF GAIA SPACE OBSERVATORY
دراسة أبعاد السدم الكوكبية باستخدام البيانات الفلكية للمرصد الفضائي "غايا"
Subject
:
Faculty of Science
Document Language
:
Arabic
Abstract
:
The major difficulty that faces many of planetary nebula studies is their unreliable distances. This strong handicap prevents astronomers from achieving a decisive solution for some planetary nebula quantities, such as the formation rate and the Galactic chemical gradients. This long-standing problem is about to be solved with the recent and upcoming parallax measurements of Gaia space mission, at least for nearby planetary nebulae. Currently, the Gaia mission provides the parallax measurements for ~ 1.7 billion stars. The present thesis is dedicated to obtaining the parallax measurements for the central stars of planetary nebulae from the Gaia second release catalogue “Gaia DR2”. Not only the extracted Gaia parallaxes increase the number of planetary nebulae with trustful distances but can also be used to test the quality and precision of other methods usually applied to derive the distances of individual planetary nebulae. Further, we use the Gaia DR2 trigonometric distances to improve two of the available statistical distance scales through constructing a calibration sample with high confidence distances. As a by-product of extracting the trigonometric distances of planetary nebulae, we identify, for the first time up to our knowledge, a number of central stars of planetary nebulae. Further, we detect the variability of three central stars.
Supervisor
:
Dr. Saleh Sadaka Qutub
Thesis Type
:
Master Thesis
Publishing Year
:
1442 AH
2020 AD
Co-Supervisor
:
Dr. Aied Sulaiman Alruhaili
Added Date
:
Friday, December 25, 2020
Researchers
Researcher Name (Arabic)
Researcher Name (English)
Researcher Type
Dr Grade
Email
ايمان عوض القرني
Algarni, Eman Awad
Researcher
Master
Files
File Name
Type
Description
46832.pdf
pdf
Back To Researches Page