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HD 186641


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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

Catalogs and designations:
Proper Names   (Edit)
HD 1989HD 186641
TYCHO-2 2000TYC 5146-2250-1
USNO-A2.0USNO-A2 0825-16872985
HIPHIP 97233

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