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

HD 164731


Contenidos

Imágenes

Subir su imagen

DSS Images   Other Images


Artículos relacionados

A photometric study of BL Herculis
Photometric observations of the prototype variable BL Her are described.The reddening, metallicity, temperature, and surface gravity of the starare determined. A Baade-Wesselink analysis is made to determine theradius and distance to the variable. The mass of the star is determinedto be 0.75 solar, placing it in the range of RR Lyrae variables. Themetallicity of +0.20, however, is greater than that of any known RRLyrae variable.

Revised photometric properties for the multiperiodic variable HD 200925
The spectroscopic data collected on the HD 200925 variable star in theuvby and beta systems have been analyzed. The results indicate that thisvariable is multiperiodic, with a reddening value, E(b-y), equal to0.029 mag. The reddening-corrected normals for y, (b-y), and c(1)yielded a mean effective temperature of 7020 K, mean log surface gravityof 3.44, and a mean bolometric magnitude of 0.8 mag. A preliminary meanradius of 4.1 solar radii has been determined. The m(1) data show thatthe blanketing is high, but this index varied in an anomalous way whichprecluded a definitive determination of Fe/H. Two possible explanationsare considered for the behavior of the m(1) index: (1) a highmicroturbulence excited by the secondary pulsation mode, and (2) theAm/Fm phenomenon.

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:Hércules
Ascensión Recta:18h01m52.04s
Declinación:+20°08'40.9"
Magnitud Aparente:8.289
Distancia:121.065 parsecs
Movimiento Propio en Ascensión Recta:-7.3
Movimiento Propio en Declinación:-9.9
B-T magnitude:8.723
V-T magnitude:8.325

Catálogos y designaciones:
Nombres Propios   (Edit)
HD 1989HD 164731
TYCHO-2 2000TYC 1562-943-1
USNO-A2.0USNO-A2 1050-09562708
HIPHIP 88296

→ Solicitar más catálogos y designaciones a VizieR