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We use images taken with the infrared channel of the Wide Field Camera 3 onthe Hubble Space Telescope (HST) to study the multiple main sequences (MSs) ofNGC 2808. Below the turn off, the red, the middle, and the blue MS, previouslydetected from visual-band photometry, are visible over an interval of about 3.5F160W magnitudes. The three MSs merge together at the level of the MS bend. Atfainter magnitudes, the MS again splits into two components containing ~65% and~35% of stars, with the most-populated MS being the bluest one. Theoreticalisochrones suggest that the latter is connected to the red MS discovered in theoptical color-magnitude diagram (CMD), and hence corresponds to the firststellar generation, having primordial helium and enhanced carbon and oxygenabundances. The less-populated MS in the faint part of the near-IR CMD ishelium-rich and poor in carbon and oxygen, and it can be associated with themiddle and the blue MS of the optical CMD. The finding that the photometricsignature of abundance anticorrelation are also present in fully convective MSstars reinforces the inference that they have a primordial origin.

The infrared eye of the Wide-Field Camera 3 on the Hubble Space Telescope reveals multiple main sequences of very low-mass stars in NGC 2808