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
(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
(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
(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.
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