Free Access
Fig. 13
Helium abundance as derived using the icf(He) proposed by Kunth & Sargent (1983, top, Peimbert & Torres-Peimbert (1977, centre and assuming no gradient in helium abundance (bottom) vs. [O iii]λ5007/Hβ. Symbol and colour codes are as in Fig. 10.
This figure is made of several images, please see below:
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.