Application of CCD uvby photometry to the globular cluster NGC 6397
The CTIO 4-m prime-focus CCD has been used with Stromgren uvby filters to study the turnoff of the globular cluster NGC 6397. A well-defined CM diagram to V about 18 has been achieved. A previously noted correlation between delta m1 and delta c1 for turnoff stars appears to be confirmed by the observations. This correlation is not predicted by model atmosphere synthesis of Stromgren colors, and has not been confirmed by recent observations of metal-poor dwarfs bluer than b-y = 0.40 by Schuster and Nissen (1987). An age of 16.6 + or - 0.7 x 10 to the 9th yr is indicated for a color excess of E(b-y) = 0.13 and (Fe/H) = -2.2. 43 references.
- Research Organization:
- Kansas Univ., Lawrence
- OSTI ID:
- 5955260
- Journal Information:
- Astron. J.; (United States), Journal Name: Astron. J.; (United States) Vol. 93; ISSN ANJOA
- Country of Publication:
- United States
- Language:
- English
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