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Adrienne Cool

Adrienne Cool

(SFSU)

Adrienne Cool is a native of New York City, and received her undergraduate degree in physics at Yale University. She spent a few years after college working on medical imaging techniques, and then went to Columbia University where she earned a Master's degree in electrical engineering. During that time she happened on some popular astronomy books and decided that astronomy was for her. Adreinne bought a pair of binoculars, learned the constellations from her rooftop in Brooklyn, and went off to a PhD program in astronomy at Harvard. She came to the San Francisco Bay Area for a postdoc at Berkeley, and has now pretty much adjusted to the ocean being on the wrong side. She is currently an associate professor in the Department of Physics and Astronomy at San Francisco State University, where she has enjoyed studying both ordinary and extraordinary stars in globular clusters with many wonderful students.



Jay Anderson

Jay Anderson

(Rice U.)

Jay Anderson received his Ph.D. from UC Berkeley in 1997 studying mass segregation in globular clusters. Since finishing his degree, he has been focusing on ways to measure accurate positions for stars in HST images. The resolving power and stability of HST provide an unprecedented opportunity for differential astrometry in crowded fields, such as globular clusters. Many long-anticipated projects are now possible. These projects include: measuring the bulk motions of satellite galaxies, measuring the plane-of-the-sky rotations of clusters, measuring fundamental distances to clusters by comparing plane-of-the-sky motions with line-of-sight motions, and doing detailed studies of how stars move within clusters (are the velocity distributions Gaussian? is there anisotropy?). Jay and Adrienne Cool are at work analyzing the internal motions of stars in the core of this particular cluster (NGC6397). Jay is currently at Rice University in Texas.



Ivan King

Ivan King

(University of Washington)

Ivan King received his Ph.D. from Harvard in 1952. He was on the faculty of the University of Illinois for several years, and then spent nearly three decades teaching at the University of California at Berkeley, where he retired in 1993. He is now a Research Professor at the University of Washington. He has worked on globular clusters for the entire length of his career. It was he who initiated HST work on NGC 6397; at the time, Adrienne Cool was his postdoc and Jay Anderson his graduate student. The first task was to delineate the color-magnitude diagram of the cluster; next the team used proper motions to remove field stars and push observations down to the lower termination of the main sequence, where low-mass stars are no longer able to burn hydrogen at their centers. This was the first of a series of projects in which Anderson and King developed new techniques of HST astrometry.



Hubble Heritage Team

Hubble Heritage Team

(STScI)

The Hubble Heritage Team worked with Adrienne Cool and collaborators to obtain images of the other half of NGC 6397. This image was combined with archival data, resulting in a complete HST WFPC2 three-color image of the cluster. Biographies of the members of the Heritage team are available from the Heritage Web Site.

Jay Anders