HST/WFC3 Photometry of NGC 2808 and Its Multiple Main Sequences

Details HST/WFC3 Photometry of NGC 2808 and Its Multiple Main Sequences HST/WFC3 Photometry of NGC 2808 and Its Multiple Main Sequences

Jan 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21715212j&link_type=abstract

American Astronomical Society, AAS Meeting #217, #152.12; Bulletin of the American Astronomical Society, Vol. 43, 2011

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Scientific paper

Recent high precision photometric observations of several globular clusters have revealed that these simple stellar populations may not be as simple as we once believed. Some globular clusters have shown interesting features in their color-magnitude diagrams indicating the presence of multiple populations. Recent HST observations of the massive globular cluster NGC 2808 have revealed the presence of three main sequences. We present new observations of NGC 2808 using the new WFC3 camera on HST. Observations are in five photometric bands covering a large wavelength range from the UVIS to the IR channels of WFC3. Moreover, these observations extend below the "turn down" in the lower main sequence (as seen in the IR CMD) and therefore reach deeper than past data sets on this cluster. We discuss various model fits and compare with other observed CMDs of other globular clusters to explore the origin of these multiple sequences.

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