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HD 192897


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Ca II H and K Filter Photometry on the UVBY System. II. The Catalog of Observations
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1995AJ....109.2828T&db_key=AST

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:わし座
Right ascension:20h17m24.78s
Declination:-02°03'47.6"
Apparent magnitude:7.699
Distance:205.339 parsecs
Proper motion RA:16.9
Proper motion Dec:-9.9
B-T magnitude:8.744
V-T magnitude:7.786

Catalogs and designations:
Proper Names
HD 1989HD 192897
TYCHO-2 2000TYC 5166-938-1
USNO-A2.0USNO-A2 0825-18026908
HIPHIP 100012

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