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

HD 29052


Contenuti

Immagini

Carica la tua immagine

DSS Images   Other Images


Articoli relazionati

Effective temperature scale and bolometric corrections from 2MASS photometry
We present a method to determine effective temperatures, angularsemi-diameters and bolometric corrections for population I and II FGKtype stars based on V and 2MASS IR photometry. Accurate calibration isaccomplished by using a sample of solar analogues, whose averagetemperature is assumed to be equal to the solar effective temperature of5777 K. By taking into account all possible sources of error we estimateassociated uncertainties to better than 1% in effective temperature andin the range 1.0-2.5% in angular semi-diameter for unreddened stars.Comparison of our new temperatures with other determinations extractedfrom the literature indicates, in general, remarkably good agreement.These results suggest that the effective temperaure scale of FGK starsis currently established with an accuracy better than 0.5%-1%. Theapplication of the method to a sample of 10 999 dwarfs in the Hipparcoscatalogue allows us to define temperature and bolometric correction (Kband) calibrations as a function of (V-K), [m/H] and log g. Bolometriccorrections in the V and K bands as a function of T_eff, [m/H] and log gare also given. We provide effective temperatures, angularsemi-diameters, radii and bolometric corrections in the V and K bandsfor the 10 999 FGK stars in our sample with the correspondinguncertainties.

Stroemgren photometry of F- and G-type stars brighter than V = 9.6. I. UVBY photometry
Within the framework of a large photometric observing program, designedto investigate the Galaxy's structure and evolution, Hβ photometryis being made for about 9000 stars. As a by-product, supplementary uvbyphotometry has been made. The results are presented in a cataloguecontaining 6924 uvby observations of 6190 stars, all south ofδ=+38deg. The overall internal rms errors of one observation(transformed to the standard system) of a program star in the interval6.5

Is HR 1469=NSV 1671 a Constant Star
A revised interpretation of the possible fade in brightness of star HR1469 observed by the Hubble Space Telescope Fixed Head Star Trackers isgiven. Most likely HR 1469 was at a normal brightness on the reportedepoch of observation.

Sottometti un nuovo articolo


Link relazionati

  • - Nessun link trovato -
Sottometti un nuovo link


Membro dei seguenti gruppi:


Osservazione e dati astrometrici

Costellazione:Toro
Ascensione retta:04h34m26.85s
Declinazione:+00°24'25.2"
Magnitudine apparente:7.249
Distanza:61.614 parsec
Moto proprio RA:4
Moto proprio Dec:-101.2
B-T magnitude:8.11
V-T magnitude:7.321

Cataloghi e designazioni:
Nomi esatti   (Edit)
HD 1989HD 29052
TYCHO-2 2000TYC 82-486-1
USNO-A2.0USNO-A2 0900-01077256
HIPHIP 21307

→ Richiesta di ulteriori cataloghi da VizieR