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Title: Stellar mass loss in globular clusters
Author: McDonald, Iain
ISNI:       0000 0004 2678 670X
Awarding Body: Keele University
Current Institution: Keele University
Date of Award: 2009
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This work investigates stellar mass loss in globular clusters. It comprises of optical and infra-red photometric imaging and spectroscopy, plus radio interferometry observations. I present mid-infrared spectroscopic observations of stars in the globular clusters 47 Tucanae and u Centauri, finding 47 Tuc VI (and possibly V18) and ω Cen V6 surrounded by circumstellar silicate dust. ω Cen V42 may also be surrounded by carbon-rich dust. Much of this work is devoted to finding the threshold for dust production and the mass-loss rates from cluster stars with both chromospherically- and dust- or pulsation driven winds. Using very-high-resolution optical photometry, I have identified the transition between the two driving regimes as being at earlier spectral types than in solar-metallicity stars, suggesting that pulsation and continuum-driving become the dominant wind drivers at around K5~M3, or ~1500 L.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available