Fig. 9.
Analytical (aluminum), measured (including error bars) and fitted instrumental polarization (IP) of the telescope and M4 as a function of telescope altitude angle in the Y-, J-, H-, and Ks-band from the measurements of HD 217343 taken in 2018 after the re-aluminization of M1 and M3. For science observations the telescope altitude angle is restricted to 30° ≤a ≤ 87°.
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.