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 TypeDr GradeEmail
ايمان عوض القرنيAlgarni, Eman AwadResearcherMaster 

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