Astrophysical Studies using NGC 4414
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Measuring the Universe
using NGC 4414
NGC 4414 is one of the galaxies used to measure
the extragalactic distance scale in the
HST Key Project. The team led by Wendy Freedman
uses
Cepheid variable stars as their primary method
of measuring distances to galaxies, they have recently
completed an 8 year effort to measure the expansion
rate of the universe.
Background Information
-
Galaxies: Their Classification, Galaxy Evolution,
and the Next Generation Space Telescope.
-
Glossary of terms for measuring distance
scales.
The Discovery of a Possible Luminous Blue Variable
in NGC 4414
While exploring the potential of creating a Hubble Heritage image from the Hubble Space Telescope (HST) archive data
of NGC 4414, astronomer and Heritage image processor,
Lisa Frattare serendipitously discovered
an uncatalogued variable star within this galaxy.
The Heritage team's observations, 5 years later,
of the missing portion of NGC4414 included more
observations of the variable star which falls in
the overlap region
of the two pointings of the telescope. The preliminary
results from a continuing scientific study with
collaborator David Zurek (STScI) were presented
at the American Astronomical
Society meeting in
Chicago, May 30-June 3, 1999.
Often information is presented in the form of
a ``poster'' at such meetings, pinned to walls in
an exhibition hall. Click on sections of this icon
of their poster, or on the Table of Contents beside
it, in order to examine the images, or read the
text, in detail.
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