Broad-band photometry of NGC 6530.
Summary. New UBV photographic photometry of NGC 6530 has yielded an age range of 1-3 million years for most of the stars in the gravitational contraction stage. No 3He for the initial cloud has been detected and the cloud temperature seems to lie between 5 and 10 K. Significant differential absorption within the cluster volume is not evident.
Monthly Notices of the Royal Astronomical Society
- Pub Date:
- February 1977