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Physics & Astronomy Department

Astr111 Photography Projects, Spring 2007

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NGC 3893, Kelly Barrett

NGC 3893

Tucked away amidst the stars forming the hind legs of the Great Bear constellation is the spiral galaxy NGC 3893, which has a 10.3 magnitude spiral that covers a 3' diameter area. A spiral galaxy consists of young stars on a flattened disk, rotating around a central bulge of older stars, as well as a surrounding halo and dense clusters of old stars called globular clusters. The disk is very visible due to the presence of the young, hot stars, which are often arranged in a spiral pattern.

In order to get the best image for this spiral galaxy, I used color filters red (R), green (V), blue (B), and clear (C) at an exposure time of 5 pictures at 60 seconds each. After editing the separate images, then combining them, I saw a blue hue on the arms of the galaxy, extending outward- these show the heat of the young stars. Also, I found that there is another interesting object just off to the left of NGC 3893. At first it appeared as a star with a small halo surrounding it, but when zooming in, it became evident that it is indeed another galaxy, known as GSC 3452: 1458. Perhaps this galaxy is neighboring NGC 3893 like so many other galaxies sit next to others. The distance to NGC 3893 is 43 million light years, the angular size is 92 arcseconds, and the linear size is 19,000 light years.

References:

Murphy, P. "Spiral Galaxies." National Radio Astronomy Observatory. <http://www.nrao.edu/imagegallery/php/level2a.php?class=Galaxy&subclass=Spiral>

Dr. Cardall and Dr. Daunt. "Spiral Galaxies." Stars, Galaxies, and Cosmology. <http://csep10.phys.utk.edu/astr162/lect/galaxies/spiral.html>

Right Ascension (J2000) 11:48:39.1
Declination (J2000) +48:42:40
Filters used blue(B), green(V), red(R), and clear(C)
Exposure time per filter 5x60 seconds in BVRC
Date observed

March 1, 2007 BVRC