Home     Baþlangýç     Evrende yaþayabilmek için    
Inhabited Sky
    News@Sky     Gökyüzü görüntüsü     Koleksiyon     Forum     Blog New!     SSS     Basýn     Giriþ  

HD 9963


Ýçindekiler

Görüntüler

Resim Yükleyin

DSS Images   Other Images


Ýlgili Makaleler

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.

Yeni bir Makale Öner


Ýlgili Baðlantýlar

  • - Baðlantý Bulunamadý -
Yeni Bir Baðlantý Öner


sonraki gruplarýn üyesi:


Gözlemler ve gökölçümü verileri

Takýmyýldýz:Kucuk Su yilani
Sað Açýklýk:01h35m07.35s
Yükselim:-67°08'10.4"
Görünürdeki Parlaklýk:8.212
Uzaklýk:131.406 parsek
özdevim Sað Açýklýk:-26.8
özdevim Yükselim:-0.7
B-T magnitude:8.578
V-T magnitude:8.243

Kataloglar ve belirtme:
Özgün isimleri   (Edit)
HD 1989HD 9963
TYCHO-2 2000TYC 8856-630-1
USNO-A2.0USNO-A2 0225-00412053
HIPHIP 7383

→ VizieR 'den daha fazla katalog ve tanýmlama isteyin