The most luminous groups are multiple stellar systems.
AGB stars are less luminous than multiple stellar systems, but they are significantly more luminous than YSOs and post-AGB stars.
In Fig. 5 (upper panel), we can see a clear separation between two clouds: one formed by foreground objects, AGBs, and possible AGB stars, and multiple stellar systems; and a second one consisting of post-AGBs, YSOs, and background sources.
Multiple stellar systems, foreground objects, and AGB stars, occupy the "bluer" part of the diagram, while YSOs, post-AGB stars, and background objects, are found in the "redder" part.
AGB stars, other late-type pulsating giants, multiple stellar systems, and foreground objects, occupy the "bluer" part of the color-magnitude diagrams and YSOs, post-AGB stars, and background objects, tend to be found in the "redder" part.
As in Section 3.1, we divide classified sources into groups of: (1) AGB stars, (2) other late-type pulsating giants, (3) post-AGB stars, (4) multiple stellar systems, (5) YSOs, (6) background objects, (7) foreground objects.
For example, in the diagram S7 L24 vs. N3 L15 (middle panel of Fig. 7) it is the only object classified as a multiple stellar system in the "redder" part of the diagram.
Ellipticals show none of the spiral features but are more densely packed stellar systems.
This period-luminosity relationship has been used to establish the distances of remote stellar systems.
She is a manager for Stellar Systems, a software consulting company.
Soviet astronomer and astrophysicist best known for his theories concerning the origin and evolution of stars and stellar systems.
