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Fig. 2

image

An example of a finding chart from our observing run with CRIRES at the VLT. The target star, GC22, shown here, is one of our nine M giants in the Galactic centre field with stars only 2.5 − 5.5′ north of the very centre of the Milky Way. The left panel is an image in the R band at 660 nm (which is observed with the ESO Schmidt telescope and is from the VO-Paris Data Centre in Paris), while the right one shows the very same field but at 2.2μm (a UKIDSS K-band image from DR9, see Lawrence et al. 2013). The large difference in appearance is caused by the massive dust extinction towards this field, which prohibits optical spectroscopy. The inset shows our K band spectrum of GC22, from which we can derive the Fe, Mg, Si, and Ca abundances. The adaptive optics (AO) system works in the R band.

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