Other
Scientific paper
Dec 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...211.9512e&link_type=abstract
American Astronomical Society, AAS Meeting #211, #95.12; Bulletin of the American Astronomical Society, Vol. 39, p.896
Other
Scientific paper
NGC 1311 is a nearby (D = 5.5 Mpc), but little studied, late-type spiral (SBm). It has been observed with HST/WFPC2 (F300W, F606W and F814W) and NICMOS (NIC3 F160W) as part of a program to build a multiwavelength imaging database of nearby galaxies. This allows for the study of the resolved stellar population from 2900 Angstroms to 1.6 microns. Color-magnitude and color-color 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. Analysis of the photometry of the candidate star clusters suggests that NGC 1311 had an earlier star and cluster forming episode 1 Gyr ago or more. This is consistent with observational work on other nearby low-luminosity galaxies indicating a bursting mode of star-formation. The recent star formation, as traced by the NUV continuum, is concentrated at the east and west ends of the central bulge-like concentration. This is reminiscent of stochastic star formation models as well as the observed properties of other low-luminosity star-forming galaxies (e.g., Sextans A). NGC 1311 is an excellent example of a nearby, low-luminosity, star-forming, gas-rich galaxy that is evolving in relative isolation. Understanding the star- and cluster-formation history and chemical evolution of such galaxies is an essential part of unraveling the problem of galaxy evolution.
This work is supported by NASA Hubble Space Telescope grants HST-GO-09124* and HST-GO-09824*.
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