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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.

Table of Contents
(a) Introduction
(b) Field of View
(c) How the Light Varies
(d) The Case for a Luminous Blue Variable
(e) Acknowlegments
Image Map
image map for variable star information (a) The abstract for this poster. (b) Field of View of WFPC2 (e) Acknowledgments (c) How the light varies. (d) The Case for a Luminous Blue Variable