Document Details

Document Type : Thesis 
Document Title :
A study for Determining the Distances and Physical Properties of Planetary Nebulae
دراسة لتعيين المسافات والخصائص الفيزيائية للسدم الكوكبية
 
Subject : Astronomy department 
Document Language : Arabic 
Abstract : The present thesis is dedicated to study one of the important topics in the field of planetary nebulae, which is their distances. The distance of planetary nebula is the essential key for determining its important parameters. For this reason, we have discussed the known individual and statistical distance methods. Finally we have demonstrated a new statistical distance scale, which is based on two physical relations. The first relation correlate between the ionized mass and the radius of planetary nebulae and the second relation correlate between the radio surface brightness temperature and the radius of planetary nebulae. The new distance scale is the average of the two distances obtained using the two correlations. The two correlations are calibrated using nearly 270 planetary nebulae with well-determined individual distances extracted from literature. This calibrating sample is compared with that of other statistical distance scales and shows a well agreement with most of them. Furthermore, the calibrating sample is applied to compare the different individual distance methods. The results show that all methods are comparable to each other except the gravity distance method, which gives higher distances for planetary nebulae. The new distance scale is verified by determine the distance to Galactic center and the expected distribution of Galactic bulge planetary nebulae. Furthermore, we compared our distance scale with alternative distance scales in literature. The new statistical distance scale is applied to determine the distances for about 650 Galactic planetary nebulae. Based on the new scale, we have determined a few parameters of planetary nebulae that are distance dependent. 
Supervisor : dr. Alaa Eldin Fouad Mohammed Ali 
Thesis Type : Master Thesis 
Publishing Year : 1434 AH
2013 AD 
Co-Supervisor : Prof. Hassan Basurah 
Added Date : Tuesday, February 5, 2013 

Researchers

Researcher Name (Arabic)Researcher Name (English)Researcher TypeDr GradeEmail
زينب محمد السلميAlsolami, Zainab MohammadResearcherMaster 

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