Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...208.1404e&link_type=abstract
American Astronomical Society Meeting 208, #14.04; Bulletin of the American Astronomical Society, Vol. 38, p.93
Astronomy and Astrophysics
Astronomy
Scientific paper
NGC 1311 is a nearby, but little studied, Magellanic spiral (SBm). It has been observed with HST/WFPC2 and NICMOS as part of a program to build a multiwavelength imaging database of nearby galaxies. The data for this study are a set of HST/WFPC2 images in F300W, F606W and F814W, and an HST/NICMOS image in F160W. This allows for the study of the resolved stellar population from 2900 Angstroms to 1.6µ. There is photometric evidence for a population of relatively compact star clusters with ages ranging from ≈10 Myr to ≈1 Gyr. Color-magnitude diagrams of the resolved stars show clear evidence for hot main-sequence stars with ages of 10s of Myr and cooler evolved stars with ages of 100s of Myr. Isochrone fits indicate a metallicity of 0.2 to 0.4 Solar.The only distance estimates in the literature for NGC 1311 are Hubble-law velocity distances in the range 5.5 to 6 Mpc. The method of bright blue stars provides an improved estimateof 4.6±0.5 Mpc.
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