Free Access

Fig. 2


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.

Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.

Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.

Initial download of the metrics may take a while.