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Title: An observational study of post-asymptotic giant branch stars.
Author: Sahin, Timur
ISNI:       0000 0001 3545 1459
Awarding Body: Queens University Belfast
Current Institution: Queen's University Belfast
Date of Award: 2008
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In this thesis, we present an LTE model atmosphere analyses of a group of early B-type postasymptotic giant branch (pAGB) stars. With initial masses::; 9Mo, post-AGB stars form an important group of evolved stars and provide a unique opportunity to study stellar evolution almost on a human time-scale. Post-AGB stars have spectral types ranging from K to Band luminosities between 103 and 104Lo. These objects ended their asymptotic giant branch (AGB) evolution phase with a peliod of strong mass loss (10-7 - 1O-4Moyr-l ) and have been evolving from cooler to hotter temperatures at almost constant luminosity on a timescale of ~ 104yr. B-type pAGB stars span a wide range in effective temperature (10 000 - 30000K). Their expected surface gravities (log g) and effective temperatures (Terr ) coincide with those of B stars evolving from the main sequence. Therefore systematic observational analyses are required to to distinguish these two groups. Furthermore, post-AGB stars may be divided into four distinct groups bqsed on their chemical composition. In this thesis, groups I and II represent post-AGB stars which are very metal deficient with CjO~l and metal poor with CjO
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available