Home     Sopravvivere Nell'Universo    
Services
    Perché adottare     Donatori     Astro Foto     La collezione     Forum     Blog New!     FAQ     Login  
→ Adopt this star  

HD 54808


Contenuti

Immagini

Carica la tua immagine

DSS Images   Other Images


Articoli relazionati

Five-colour photometry of early-type stars in the direction of galactic X-ray sources
The results of five-color (Walraven system) photometry of 551 O- andB-type stars located in 17 fields of a few square degrees aroundgalactic X-ray sources are presented. From a comparison ofreddening-free combinations of color indices with theoretical values,calculated for model atmospheres of Kurucz (1979), effective temperatureand surface gravity for these stars are derived. In addition theirabsolute magnitude are determined by combining these parameters with theresults of evolutionary calculations of massive stars. These effectivetemperatures are in good agreement with the temperature scale ofBohm-Vitense (1981) for stars of luminosity classes II to V. For thesupergiants the effective temperatures are about 40 percent higher. Forstars of luminosity classes III to V the absolute magnitudes agree wellwith the results of independent luminosity calibrations of spectraltypes, but for brighter stars they deviate systematically. Thephotometric data are also used to study the interstellar reddening inthe direction of the X-ray sources.

Sottometti un nuovo articolo


Link relazionati

  • - Nessun link trovato -
Sottometti un nuovo link


Membro dei seguenti gruppi:


Osservazione e dati astrometrici

Costellazione:Unicorno
Ascensione retta:07h10m23.12s
Declinazione:+00°15'43.4"
Magnitudine apparente:8.758
Distanza:92.593 parsec
Moto proprio RA:-8.7
Moto proprio Dec:-31.1
B-T magnitude:9.265
V-T magnitude:8.8

Cataloghi e designazioni:
Nomi esatti
HD 1989HD 54808
TYCHO-2 2000TYC 163-1317-1
USNO-A2.0USNO-A2 0900-04401266
HIPHIP 34629

→ Richiesta di ulteriori cataloghi da VizieR