The open clusters NGC 6613 (M 18) and NGC 6716.
Abstract
UBV-magnitudes have been determined for stars in the open clusters NGC 6613 and NGC 6716, using a combination of photoelectric and photographic photometry. Spectral classes for the brighter stars have been determined from slit-spectra and objective prism-plates. The absorption has been determined to 1m.4 in front of NGC 6613 and to 0 .4 in front of NGC 6716. Their respective distances are 1250 pc and 600 Pc. NGC 6613 is a young cluster, NGC 6716 is of medium age. Key words: open clusters - UBV photometry - spectral classification
- Publication:
-
Astronomy and Astrophysics
- Pub Date:
- December 1971
- Bibcode:
- 1971A&A....15..439L