Presentation on theme: "Variable Stars of Globular Clusters in the Large Magellanic Cloud Evan McClellan (FSU) Horace Smith (advisor) (MSU) Charles Kuehn (MSU) August 6 th, 2008."— Presentation transcript:
Variable Stars of Globular Clusters in the Large Magellanic Cloud Evan McClellan (FSU) Horace Smith (advisor) (MSU) Charles Kuehn (MSU) August 6 th, 2008
Satellite Galaxies Large and Small Magellanic Clouds, other dwarf spheroidal galaxies Role in formation of Galactic Halo? NASA/ESA 2008
Oosterhoff Dichotomy Bimodal Period Distribution for Galactic GCs OoI: average ‘ab’ P~0.55 days OoII: average ‘ab’ P~0.65 days Oosterhoff Gap: 0.58 < P < 0.62 What about globular clusters in satellite galaxies? Catelan 2005
Procedure For each set of data- –Define “star” –Find stars –Align images –Combine –Make CMD Putting it all together- –Synch star names –Calibrate brightness –Find “variables” –Filter out non-RR-Lyrae –Combine lightcurves –Plot period vs. amplitude
References Carrol and Ostlie, An Introduction to Modern Astrophysics, Addison-Wesley, 2007 Catelan, M. 2005, astro-ph/0507464 Catelan, M. 2006, astro-ph/0604035 De Lee, N. Variable Stars in NGC6304, MSU 2004 MSU, 2005, http://www.pa.msu.edu/soarmsu/ NASA/ESA, 2008, http://www.spacetelescope.org/ SMARTS Consortium Website, 2008, http://www.astro.yale.edu/smarts/ Smith, H.A. RR Lyrae Stars, Cambridge University Press, 1995
Thanks Special thanks to Dr. Horace Smith and Charles Kuehn
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