of Globular Star Clusters
Apr 12, 2010
by Rich Lanker and Mike O'Neal
a fascinating story about globular star clusters and how astronomers
can determine whether these dense aggregates of stars go through
a stage in there lives called "core collapse." See
the well written article, "A
Thousand Blazing Suns" by Brian W. Murphy from Butler
Ridge Observatory 0.76-m f/6 Newtonian, ST-1001 unfiltered,
8-minutes total integration, August 1, 2002 - Tim Cann, John
Rogers and Steve Brewster. Click on image for Hi-Resolution
in the constellation Ophiuchus at a distance of 70,000 light-years,
a number of variable stars (72 identified by 1963) have been
detected in this cluster including a nova in 1938 (from Burnham's
Celestial Handbook,vol.2 p.1263).
by Sara Martin, Pam Sable & Steve Brewster
taken at the 0.76-m reflector with an ST-6.
in the constellation Sagitta, M-71 appears to be less condensed
than some of the other examples of globulars on this page.
Globular star clusters are classified by this
difference and are designated with the Roman numerals I (most
highly condensed) to XII (loosely condensed). The class for
M-71 is undetermined, but probably higher than IX. M-13 is class
V, M-14 = class VIII, M-15 = class IV. The image is a mosaic
of 4 CCD frames of 30 seconds' exposure each. Steve Brewster,
0.76-m f/6 reflector + ST6.
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