Large Magellanic Cloud Distance and Structure from Near-Infrared Red Clump Observations

Details Large Magellanic Cloud Distance and Structure from Near-Infrared Red Clump Observations Large Magellanic Cloud Distance and Structure from Near-Infrared Red Clump Observations

Jul 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aj....138....1k&link_type=abstract

The Astronomical Journal, Volume 138, Issue 1, pp. 1-6 (2009).

Astronomy and Astrophysics

Astronomy

11

Magellanic Clouds, Stars: Distances, Stars: Luminosity Function, Mass Function

Scientific paper

We have applied the Infrared Survey Facility Magellanic Clouds Point-Source Catalog to the mapping of the red clump (RC) distance modulus across the Large Magellanic Cloud (LMC). Using the J- (1.25 μm) and H- (1.63 μm) band data to derive a reddening free luminosity function and a theoretical RC absolute magnitude from stellar evolution libraries, we estimate a distance modulus to the LMC of μ = 18.54 ± 0.06. The best fitting plane inclination, i, and the position angle of the line of nodes, phi, have little dependence on the assumed RC absolute magnitude; we find i = 23fdg5 ± 0fdg4 and phi = 154fdg6 ± 1fdg2. It was also noted that many fields included a significant asymptotic giant branch bump population that must be accounted for.

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