Helium abundances in NGC 2264, II Scorpii, and I Lacertae.
Abstract
We determine the helium abundances of three clusters and associations: NGC 2264, II Sco, and I Lac. The very young cluster NGC 2264 has an abundance of N(He) = 0.08 while the two assodations have abundances of N(He) = 0.10. The difference is significant at the 3 a level. Subject headings: abundances, stellar - associations open clusters
- Publication:
-
The Astrophysical Journal
- Pub Date:
- March 1973
- DOI:
- Bibcode:
- 1973ApJ...180..635P