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

HD 18853


Contenidos

Imágenes

Subir su imagen

DSS Images   Other Images


Artículos relacionados

Barium stars, galactic populations and evolution.
In this paper HIPPARCOS astrometric and kinematical data together withradial velocities from other sources are used to calibrate bothluminosity and kinematics parameters of Ba stars and to classify them.We confirm the results of our previous paper (where we used data fromthe HIPPARCOS Input Catalogue), and show that Ba stars are aninhomogeneous group. Five distinct classes have been found i.e. somehalo stars and four groups belonging to disk population: roughlysuper-giants, two groups of giants (one on the giant branch, the otherat the clump location) and dwarfs, with a few subgiants mixed with them.The confirmed or suspected duplicity, the variability and the range ofknown orbital periods found in each group give coherent resultssupporting the scenario for Ba stars that are not too highly massivebinary stars in any evolutionary stages but that all were previouslyenriched with Ba from a more evolved companion. The presence in thesample of a certain number of ``false'' Ba stars is confirmed. Theestimates of age and mass are compatible with models for stars with astrong Ba anomaly. The mild Ba stars with an estimated mass higher than3Msun_ may be either stars Ba enriched by themselves or``true'' Ba stars, which imposes new constraints on models.

Lithium in dwarf and subgiant Ba stars
Not Available

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:Hidra macho
Ascensión Recta:02h58m10.18s
Declinación:-67°22'31.7"
Magnitud Aparente:8.5
Distancia:120.048 parsecs
Movimiento Propio en Ascensión Recta:-1
Movimiento Propio en Declinación:-109.9
B-T magnitude:9.056
V-T magnitude:8.546

Catálogos y designaciones:
Nombres Propios   (Edit)
HD 1989HD 18853
TYCHO-2 2000TYC 8865-1347-1
USNO-A2.0USNO-A2 0225-00739913
HIPHIP 13842

→ Solicitar más catálogos y designaciones a VizieR