Averaged HARPS spectra of β Pictoris (flux as a function of wavelength in Å). They reveal the very high S/N achieved, even at very short wavelengths at 3820 Å and 3860 Å. Each detected Fe I line is indicated by a tick mark at +20.5 km s-1, i.e., the β Pictoris heliocentric radial velocity. The detected signatures are due to the stable gas within the circumstellar disk. Left: section of the spectrum from 3820 to 3827 Å. Three lines are detected: one line from the 6928 cm-1 excited levels at 3820.7 Å, one line from the ground base level near 3824.7 Å, and one line from the 7377 cm-1 excited levels at 3823.15 Å. Right: spectral region from 3856 to 3861 Å. The strongest Fe I line from ground base level is seen near 3860.15 Å, as well as the line from the 416 cm-1 excited level (noted Fe I* near 3856.65 Å).
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.