General information
My research focuses on the study of classical novae, a class of cataclysmic variable stars that undergo outbursts in which the system increases in brightness by many orders of magnitude. These systems provide crucial insights into the end stages of stellar evolution and the processes by which the Galactic interstellar medium is enriched in heavy elements. Classical novae can also serve as intermediate rungs on the cosmic distance ladder. We are presently involved in an expansive nova monitoring initiative using the Spitzer, Chandra, and Hubble Space Telescopes as well as many ground based instruments. More details about the nova initiative and our more recent findings are on my Research page.
I have also conducted research on the hypergiant star VY Canis Majoris with Roberta Humphreys and Terry J. Jones. The nebula surrounding this star is one of the most spectacular known. Using WFPC2 and ACS observations from the Hubble Space Telescope, we have been able to determine the expansion velocities for many components in the ejecta. Combining these data with radial velocity measurements we can identify multiple features that are evolving independantly from one another. By interpolating backwards in time, we have been able to associate particular features with specific historical eruptions on the surface of VY CMa. More details, including papers, images and movies, can be found on my Research page.
