Magnitudes, Colors, and Spectral Types in M 39.
Abstract
Magnitudes, colors, and spectral types are given for 28 stars in and around the galactic cluster M 39. The color-magnitude diagram shows only the main sequence. No stars of type earlier than B9 are present. The cluster is found to be essentially unreddened, and the distance modulus is 7.2 i 0.2 (p.e.) mag., corresponding to a distance of 275 + 30 (p.e.) parsecs.
- Publication:
-
The Astrophysical Journal
- Pub Date:
- May 1953
- DOI:
- 10.1086/145698
- Bibcode:
- 1953ApJ...117..353J