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HD 218631


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Interstellar polarization from observations of A and F stars in high and intermediate galactic latitudes, and from stars in the Mathewson and Ford polarization catalogue
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1986A&AS...64..487K&db_key=AST

Uvby-Beta Photometry of Equatorial and Southern Bright Stars - Part Two
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1980A&AS...42..311H&db_key=AST

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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Osservazione e dati astrometrici

Costellazione:Tucano
Ascensione retta:23h10m27.09s
Declinazione:-60°33'51.8"
Magnitudine apparente:6.717
Distanza:92.678 parsec
Moto proprio RA:49.5
Moto proprio Dec:-24.9
B-T magnitude:6.991
V-T magnitude:6.74

Cataloghi e designazioni:
Nomi esatti   (Edit)
HD 1989HD 218631
TYCHO-2 2000TYC 9125-333-1
USNO-A2.0USNO-A2 0225-31754657
HIPHIP 114428
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