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Post Info TOPIC: Messier 14


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NGC 6402
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Messier 14 (also known as M14, NGC 6402 or GCL 72) is a magnitude ++8.32 globular star cluster located 30,000 light-years away in the constellation Ophiuchus.

Messier 14 was discovered by French astronomer Charles Messier on June 1, 1764.

Right Ascension 17h 37m 36.15s, Declination -03 14' 45.3"

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Posts: 131433
Date:
Messier 14
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Title: The Colour-Magnitude Diagram of the Globular Cluster M14
Authors: Erik D. Reinhart, Thayne A. McCombs, Andrew N. Darragh, Zheyu J. Liu, Brian W Murphy, Kyle E. Conroy

Using the SARA 0.9 meter telescope at Kitt Peak National Observatory (KPNO) we obtained R images during the summer of 2010 and V images during the summer of 2012 of the globular cluster M14. These images were analysed using the DAOPHOT/ALLFRAME package of Stetson (1987,1994) to create a preliminary colour-magnitude diagram (CMD) of M14. We have positively identified the positions of 64 of the 112 known RR Lyrae stars on the CMD. We find considerable spread in both the magnitudes and colour of the RR Lyrae stars indicating a significant amount of differential reddening on relatively small scales. This is also seen in the giant branch which shows up to ~0.15 magnitude spread in V-R colour. We also found the median magnitude of the RR Lyrae stars and hence the horizontal branch to be V=17.2.

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