Massive stars are rare, but emit most of the light we observe in the Universe and create many of the heavy elements. New observational approaches and long time-series are utilized in order to examine the basic observable properties of the stars and the mass lost during their lifetimes. In order to study the winds and the long-term changes of the stars, hot stars with some of the strongest winds (the luminous blue variables) were studied in detail with optical spectroscopy and photometry. A 25-year survey on the prototype P Cygni is presented, where the long-term changes are documented for many parameters that have not been examined before. In addition, we present a detailed study of the H-band emitting region through interferometric imaging with the CHARA Array as well as spectrophotometry. A detailed study of the Hα line variability of the LBV η Carinae near its recent periastron is presented. The LBV candidate HDE 326823 is found to be a binary system with variability driven by the close binary companion and Roche lobe overflow. Finally, I present a three-year study of many LBVs in the Milky Way Galaxy and Magellanic Clouds for a statistically significant survey of the long-term variability properties of these rare stars as a population. Future studies of LBV winds are outlined, as well as a short discussion of Georgia State University’s Hard Labor Creek Observatory for these types of studies.
| Identifer | oai:union.ndltd.org:GEORGIA/oai:digitalarchive.gsu.edu:phy_astr_diss-1051 |
| Date | 02 April 2012 |
| Creators | Richardson, Noel D |
| Publisher | Digital Archive @ GSU |
| Source Sets | Georgia State University |
| Detected Language | English |
| Type | text |
| Format | application/pdf |
| Source | Physics and Astronomy Dissertations |
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