Home     Per cominciare     Sopravvivere Nell'Universo    
Inhabited Sky
    News@Sky     Astro Foto     La collezione     Forum     Blog New!     FAQ     Stampa     Login  

HD 190662


Contenuti

Immagini

Carica la tua immagine

DSS Images   Other Images


Articoli relazionati

Properties of the Walraven VBLUW photometric system
The Walraven five-channel (VBLUW) photometer has been used primarily tostudy Cepheids and RR Lyrae variables. Those properties of the VBLUWphotometric system are discussed which are important for analyzing andinterpreting data on such stars. The standard stars that define thesystem are examined, the long-term stability of these stars is examined,and the responses of the photometric passbands are analyzed. Correctionsfor atmospheric extinction and interstellar reddening are reviewed,noting that color terms in the extinction corrections are sufficientlysmall to be neglected and that nonlinear terms in reddening correctionscan also be neglected provided the reddening is not higher than about1.25 magnitudes. Application of the VBLUW system to the classificationof A, F, and G stars, Hyades main-sequence stars, bright field stars,and subdwarfs is demonstrated, and observed two-color diagrams arecompared with theoretical diagrams based on model atmospheres. It isconcluded that a three-dimensional classification based on effectivetemperature, surface gravity, and heavy-element abundance is possiblefor A, F, and G spectral types and that VBLUW photometry is more thantwice as sensitive as Stroemgren uvby photometry to differences inheavy-element abundances below 8000 K.

Sottometti un nuovo articolo


Link relazionati

  • - Nessun link trovato -
Sottometti un nuovo link


Membro dei seguenti gruppi:


Osservazione e dati astrometrici

Costellazione:Aquila
Ascensione retta:20h05m56.01s
Declinazione:+04°46'32.0"
Magnitudine apparente:6.959
Distanza:133.869 parsec
Moto proprio RA:14.1
Moto proprio Dec:-6.7
B-T magnitude:7.071
V-T magnitude:6.969

Cataloghi e designazioni:
Nomi esatti   (Edit)
HD 1989HD 190662
TYCHO-2 2000TYC 502-2141-1
USNO-A2.0USNO-A2 0900-17675606
HIPHIP 98998

→ Richiesta di ulteriori cataloghi da VizieR