Color-Magnitude Diagrams With and Without Subgiants (IMAGE)

Carnegie Institution for Science

Color-Magnitude Diagrams With and Without Subgiants

Caption

Color-magnitude diagrams for all bright stars within 1,000 light-years of the sun as determined by Mt. Wilson astronomers in 1935. (Left) Diagram without the subgiants, in which it is difficult to connect the two clear populations. (Right) Diagram with the subgiants discovered by Walter Adams et al. The subgiants form a connective tissue between the sequences that inspired Allan Sandage and his colleagues to advance the theory of stellar evolution by exploring the physical properties of these stars relative to the other sequences.

Credit

Rachael Beaton

Usage Restrictions

With credit

License

Licensed content

Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.