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HD 208251


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Interstellar reddening in the Southern Hemisphere. I - The UVBY beta observations
The uvby-beta photometric data obtained from a Southern Hemisphereobservational project is presented. A uvby-beta photometric network ofnearly 3900 A and early F stars has been established with the intentthat the stars serve as 'space probes' for measurements of interstellarreddening.

The chemical evolution of the solar neighborhood. I - A bias-free reduction technique and data sample
The possible ways of measuring the age-metallicity relation for thegalactic disk in the neighborhood of the sun are discussed. It is shownthat the use of a field star sample chosen on the basis of effectivetemperature introduces a bias which results in a monotonic increase inthe metal abundance of the disk with time. However, if theage-metallicity relation for the disk can be shown to satisfy certaincriteria, the bias introduced in such a sample can be neglected: thegalactic disk apparently satisfies the criteria. It is concluded that asample analyzed through the use of uvby and H(beta) photometry inconjunction with a self-consistent set of theoretical isochronesprovides the least biased, most accurate estimate of the age-metallicityrelation for the disk.

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Observation and Astrometry data

Constellation:インディアン座
Right ascension:21h56m29.11s
Declination:-53°02'54.0"
Apparent magnitude:7.965
Distance:150.15 parsecs
Proper motion RA:-11.9
Proper motion Dec:3.7
B-T magnitude:8.265
V-T magnitude:7.99

Catalogs and designations:
Proper Names
HD 1989HD 208251
TYCHO-2 2000TYC 8808-950-1
USNO-A2.0USNO-A2 0300-37429114
HIPHIP 108305

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