Free Access

Fig. 2


Distributions of the known members (identified in the SIMBAD database) shown in contours on the  [J]  −  [K]  versus  [K]  −  [9]  color–color diagram: a) C-rich AGBs (red; group E), AGBs (black) and OH/IR stars (blue) (O-rich AGBs; group F); b) T Tauri (brown) and YSOs (green) (group A); c) Be stars (including Wolf-Rayet stars; brown) and emission-line stars (green) (group B); d) normal stars including O–M giants and dwarfs (green; group C); e) S-stars (green; group D), and post-AGBs and planetary nebulae (brown; group G); and f) normal and starburst galaxies (green) and Seyferts (brown) (group H). The occupation zones for the groups A–H are summarized in g). The contours show 20%, 50%, and 80% of the peak value. The SIMBAD definitions of the members of the groups A–H are summarized in Table 1.

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.