Inici     Començant     Sobreviure a l'Univers    
Inhabited Sky
    News@Sky     Astro Fotografia     La Col·lecció     Fòrum     Blog New!     FAQ     Premsa     Login  

HD 208251


Contingut

Imatges

Carregar la teva Imatge

DSS Images   Other Images


Articles Relacionats

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.

Enviar un nou article


Enllaços Relacionats

  • - No s'ha trobat enllaços -
Enviar un nou enllaç


Membre dels grups següents:


Dades d'Observació i Astrometria

Constel·lació:Indus
Ascensió Recta:21h56m29.11s
Declinació:-53°02'54.0"
Magnitud Aparent:7.965
Distancia:150.15 parsecs
Moviment propi RA:-11.9
Moviment propi Dec:3.7
B-T magnitude:8.265
V-T magnitude:7.99

Catàlegs i designacions:
Noms Propis   (Edit)
HD 1989HD 208251
TYCHO-2 2000TYC 8808-950-1
USNO-A2.0USNO-A2 0300-37429114
HIPHIP 108305

→ Sol·licitar més catàlegs i designacions de VizieR