Free Access

Fig. 1

thumbnail

How areas used to compute an equivalent width are defined. In this example we plot an Hβ profile which includes both an absorption and an emission component. The green-dashed line is meant to approximate the spectral continuum while its length, Δλ, is used also to define the wavelength range over which the line itself is measured.

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.