Diffraction Limited Imaging of the Stellar Population of IC 10 with Laser Guide Star Adaptive Optics and the Hubble Space Telescope

Details Diffraction Limited Imaging of the Stellar Population of IC 10 with Laser Guide Star Adaptive Optics and the Hubble Space Telescope Diffraction Limited Imaging of the Stellar Population of IC 10 with Laser Guide Star Adaptive Optics and the Hubble Space Telescope

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...20916710s&link_type=abstract

2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #167.10; Bulletin of the American Astronomical Society,

Physics

Optics

Scientific paper

We present near-infrared Keck laser guide star adaptive optics (AO) images of the central starburst region of the Local Group dwarf irregular IC 10. The field is centered on the putative Wolf-Rayet (W-R) object [MAC92] 24. We compare these H and K' band data with an F814W image obtained with the Hubble Space Telescope. Because systematic error in AO photometry is potentially large due to uncertainties in the point spread function (PSF), we have used the Fourier power spectrum method of Sheehy, McCrady and Graham (ApJ, 647, 1517) to reduce it to 0.04 mag., or less. The W-R object [MAC92] 24 is resolved into at least six blue stars. Four of these components have near-IR colors and luminosities that make them robust WN star candidates. By comparing the K' versus [F814W]-K' color-magnitude diagram we find that the stellar population is best represented by two distinct periods of star formation, one 10 Myr ago and one significantly older (150-500 Myr). We derived reddening and distance estimates by matching the location of Carbon stars in the IC10 color-magnitude diagram (CMD) with that in the SMC CMD, as well as by locating the tip of the giant branch in the IC10 F814W, H, and K' luminosity functions. We find from the Carbon stars a distance modulus for IC 10 of about 24.5 mag., and from the tip of the giant branch a weighted mean distance modulus of (m-M) = 24.48 +/0.08 with a systematic error of +/0.16 mag due to possible mismatches between the RGB populations of IC 10 and the SMC.

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