Principal     Comenzar     To Survive in the Universe    
Inhabited Sky
    News@Sky     Astrofotografía     La Colección     Foro     Blog New!     FAQ     Prensa     Login  

HD 148226


Contenidos

Imágenes

Subir su imagen

DSS Images   Other Images


Artículos relacionados

K dwarfs and the chemical evolution of the solar cylinder
K dwarfs have lifetimes older than the present age of the Galactic disc,and are thus ideal stars for investigating the chemical evolution of thedisc. We have developed several photometric metallicity indicators for Kdwarfs, based on a sample of accurate spectroscopic metallicities for 34disc and halo G and K dwarfs. The photometric metallicities lead us todevelop a metallicity index for K dwarfs based only on their position inthe colour-absolute-magnitude diagram. Metallicities have beendetermined for 431 single K dwarfs drawn from the Hipparcos catalogue,selecting the stars by absolute magnitude and removing multiple systems.The sample is essentially a complete reckoning of the metal content innearby K dwarfs. We use stellar isochrones to mark the stars by mass,and select a subset of 220 of the stars, which is complete within anarrow mass interval. We fit the data with a model of the chemicalevolution of the solar cylinder. We find that only a modest cosmicscatter is required to fit our age-metallicity relation. The modelassumes two main infall episodes for the formation of the halo-thickdisc and thin disc, respectively. The new data confirm that the solarneighbourhood formed on a long time-scale of the order of 7 Gyr.

Enviar un nuevo artículo


Enlaces relacionados

  • - No se han encontrado enlaces -
En viar un nuevo enlace


Miembro de los siguientes grupos:


Datos observacionales y astrométricos

Constelación:Dragón
Ascensión Recta:16h22m54.70s
Declinación:+61°41'40.7"
Magnitud Aparente:8.76
Distancia:36.284 parsecs
Movimiento Propio en Ascensión Recta:113.8
Movimiento Propio en Declinación:48
B-T magnitude:9.733
V-T magnitude:8.841

Catálogos y designaciones:
Nombres Propios   (Edit)
HD 1989HD 148226
TYCHO-2 2000TYC 4190-139-1
USNO-A2.0USNO-A2 1500-06074690
HIPHIP 80243

→ Solicitar más catálogos y designaciones a VizieR