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HD 1397


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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.

Optical polarization of stars of galactic latitudes b-45 degres.
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1976A&AS...23..125S&db_key=AST

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Observation and Astrometry data

Constellation:Tucana
Right ascension:00h17m47.15s
Declination:-66°21'32.1"
Apparent magnitude:7.789
Distance:77.399 parsecs
Proper motion RA:64.8
Proper motion Dec:-4.8
B-T magnitude:8.745
V-T magnitude:7.868

Catalogs and designations:
Proper Names
HD 1989HD 1397
TYCHO-2 2000TYC 8846-638-1
USNO-A2.0USNO-A2 0225-00078782
HIPHIP 1419

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