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Title: Giant extragalactic HII regions : 30 Doradus and beyond
Author: Bosch, G.
Awarding Body: University of Cambridge
Current Institution: University of Cambridge
Date of Award: 1999
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This thesis aims to study both the stellar and the gaseous components of a sample of GEHRs and analyse the possible mechanisms that govern these forming regions. As there are no giant HII regions in our Galaxy, GEHRs from our Local Group of galaxies provide us with the data needed to understand these regions. Much has been done in this direction, and I review the latest efforts and our current knowledge in Chapter 1. Chapter 2 is focused on the analysis of the stellar population of the object that can better help us to understand GEHRs: 30 Doradus, our closest and largest neighbouring starburst. I have performed spectral classification over 175 stars in the region which allowed me to study their spatial distribution and combine with new photometry to estimate the initial mass function (IMF) and the star formation history of the stellar cluster. The results indicate a normal IMF and the existence of three distinct bursts of star formation. I also discuss the evidence found towards and against mass segregation of stars in the cluster. I have used a subset of the mentioned spectroscopic data to study the kinematics of the stars in 30 Doradus in Chapter 3. From the data I found evidence of partial dynamical mass segregation supporting the findings of the previous chapter. Assuming the cluster is virialised, I have also estimated its dynamical mass, and found it to be several times larger than the one estimated photometrically. However, more and higher resolution spectra are needed to better constrain the final value. In Chapter 4 I investigate the effect that an underlying population of binary stars could introduce in the kinematical analysis mentioned above. I have used Monte Carlo techniques to construct an artificial population of binary stars, and simulated observations of such a population to measure its kinematical parameters.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available