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

HD 220506


Contenuti

Immagini

Carica la tua immagine

DSS Images   Other Images


Articoli relazionati

The late A-type stars - Refined MK classification, confrontation with Stromgren photometry, and the effects of rotation
The MK spectral classification for late A-type stars is refined and theeffects of rotation of spectral classification and uvby(beta) photometryfor these stars are examined. It is found that, for A3 stars, the4417/4481 A wavelength ratio produces results that are inconsistent withthe Stark broadening of the H lines. It is suggested that this ratio isnot useful as a luminosity criterion at any spectral type.Self-consistent sequences of narrow- and broadline standards areestablished. The results of the refined classification system arecompared with Stromgren photometry, showing a set of low-v sin i A-typestars with anomalously large delta(c1) indices for theirluminosity types. It is proposed that these stars are rapid rotatorsseen at fairly low inclination angles.

Sottometti un nuovo articolo


Link relazionati

  • - Nessun link trovato -
Sottometti un nuovo link


Membro dei seguenti gruppi:


Osservazione e dati astrometrici

Costellazione:Gru
Ascensione retta:23h24m26.61s
Declinazione:-37°12'03.4"
Magnitudine apparente:7.342
Distanza:250 parsec
Moto proprio RA:-10.6
Moto proprio Dec:-5.1
B-T magnitude:7.477
V-T magnitude:7.354

Cataloghi e designazioni:
Nomi esatti   (Edit)
HD 1989HD 220506
TYCHO-2 2000TYC 7520-130-1
USNO-A2.0USNO-A2 0525-44226098
HIPHIP 115556

→ Richiesta di ulteriori cataloghi da VizieR