Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005hia....13..448a&link_type=abstract
Highlights of Astronomy, Vol. 13, as presented at the XXVth General Assembly of the IAU - 2003 [Sydney, Australia, 13 - 26 July
Astronomy and Astrophysics
Astronomy
Scientific paper
The Large Magellanic Cloud (LMC) is a cornerstone of the Cosmic Distance Scale and also the prototype of one-armed barred spiral dwarf irregular galaxies. In optical images the LMC has a lot of structure but in the near-infrared it has a very uniform surface brightness and shows little structure. This contrast is due to the mix of different age stellar populations found in the LMC. Standard candles that probably represent the bulk stellar population of the LMC like carbon stars and red clump stars have been used to measure the LMC's inclination based on the variation of distance with position angle. New structures like Olsen's Warp have also been found. However the 3-D structure of the very old Population II stars in the LMC has remained elusive. I will review the line-of-sight structure of the LMC with an emphasis on comparing different populations. I will discuss stars at the the Tip of the Red Giant Branch and present a new analysis of the position-dependent distances to RR Lyraes in the MACHO database where I have recalibrated the photometry based on unpublished artificial star tests.
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