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

HD 168338


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:Tavus
Sað Açýklýk:18h23m04.47s
Yükselim:-60°44'57.2"
Görünürdeki Parlaklýk:6.817
Uzaklýk:88.106 parsek
özdevim Sað Açýklýk:-6.4
özdevim Yükselim:-20
B-T magnitude:7.089
V-T magnitude:6.84

Kataloglar ve belirtme:
Özgün isimleri   (Edit)
HD 1989HD 168338
TYCHO-2 2000TYC 9068-2822-1
USNO-A2.0USNO-A2 0225-29120179
HIPHIP 90089

→ VizieR 'den daha fazla katalog ve tanýmlama isteyin