On the Color-Magnitude Diagram for M 15.
Abstract
Magnitudes and colors determined for 251 nonvariable stars in the globular cluster M 15. The resulting color-magnitude diagram indicates that the brighter stars in M 15 may belong to two sequences. The first sequence consists of red giants and supergiants and may possibly be the bright end of the subdwarf sequence. The second sequence consists of the horizontal branch characteristic of globular clusters. This branch appears to bend downward at its blue end and may thus possibly be the bright continuation of the regular main sequence.
- Publication:
-
The Astrophysical Journal
- Pub Date:
- May 1951
- DOI:
- 10.1086/145432
- Bibcode:
- 1951ApJ...113..630J