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Research Interests
Massive OB stars are those stars that produce a supernova at the end of their lives, but the evolutionary state of OB supergiants is extremely uncertain, as a result of small number statistics. They are short lived, and thus don't move very far from where they were formed within their life. During their lifetime, they will emit copious amounts of ultraviolet radiation. This radiation rapidly ionizes the surrounding interstellar gas of the giant molecular cloud, forming an H II region or Strömgren sphere.
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Galaxy formation and evolution is one of the key problems of modern astronomy. Galaxies in the universe come in a large variety of shapes and sizes, which we refer to as the Hubble sequence. The study of galaxy formation and evolution aims at explaining this variety as well as its statistical properties. Though the formation, and to some extent the evolution of galaxies still is one of the most active research areas in astrophysics. The study of galaxy formation and evolution is concerned with the processes that formed a heterogeneous universe from a homogeneous beginning, the formation of the first galaxies, the way galaxies change over time, and the processes that have generated the variety of structures observed in nearby galaxies. |
Blue stragglers stars are unusually hot and bright stars found in the cores of ancient globular clusters. They are separate from other stars on the cluster's Hertzsprung-Russell diagram. Blue straggler stars appear to violate standard theories of stellar evolution, in which all stars born at the same time should lie on a clearly defined curve in the Hertzsprung-Russell diagram, with their positions on that curve determined solely by their initial mass. Since blue stragglers often lie well off this curve, they may undergo abnormal stellar evolution. |
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