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HD 218409


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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:Pisces
Right ascension:23h07m45.68s
Declination:-00°17'45.8"
Apparent magnitude:7.049
Distance:10000000 parsecs
Proper motion RA:-6.4
Proper motion Dec:-4.1
B-T magnitude:8.541
V-T magnitude:7.173

Catalogs and designations:
Proper Names
HD 1989HD 218409
TYCHO-2 2000TYC 5242-1143-1
USNO-A2.0USNO-A2 0825-19863267
HIPHIP 114211

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