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UvbyH-beta photoelectric and CCD photometry of IC 4651
An analysis of uvbyH-beta photoelectric and CCD photometry of IC4651shows a Fe/H abundance ratio of 0.23 + or - 0.02, an E(b-y) value of0.064 + or - 0.006, and an age on the system of VandenBerg (1985) of 2.4+ or - 0.2 x 10 to the 9th yr. Scatter noted in the clustercolor-magnitude diagram can be explained by binaries, nonmembers, and ablueward hook due to the hydrogen-exhaustion phase. The cluster turnoffindicates some evidence for the presence of bimodality which issuggested to be the result of nonstandard evolution near theBohm-Vitense gap.
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Observation and Astrometry data
| Constellation: | Αετός |
| Right ascension: | 19h45m41.27s |
| Declination: | -00°41'47.9" |
| Apparent magnitude: | 7.334 |
| Distance: | 96.154 parsecs |
| Proper motion RA: | 34.6 |
| Proper motion Dec: | -52.5 |
| B-T magnitude: | 8.639 |
| V-T magnitude: | 7.442 |
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