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HD 47221


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Intermediate-Brightness Equatorial Spectrophotometric Standards
We have obtained spectral energy distributions for 41 7m 8m stars nearthe celestial equator (δ=±3°). The λλ31007600 Å spectral range is studied with a spectral resolution of 50Å. The relative rms error in the visible is 1 2%, increasing to 35% towards the edges of the wavelength interval studied. All stars arereferenced to a single standard, the circumpolar star HD 221525. Thesynthetic colors of common stars are compared with those observed infour photometric systems: U BV, W BV R, uvby, and that of the TYCHOcatalog. The program stars are recommended as secondaryspectrophotometric standards.

Optical observations of ultraviolet objects. I - Spectral classification of 103 stars /l = 200-275 deg/
Results are presented of a program of spectral classification of 103stars originally selected as ultraviolet objects from TD-1 satellitephotometry with the S2/68 experiment. Most of the objects appear to bespectroscopically normal stars; the method of selection yielded a sampleof relatively unreddened B stars at distances up to about 2 kpc. Thisresult is compared with recent studies of the spatial distribution ofinterstellar extinction in the same regions of the sky.

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Osservazione e dati astrometrici

Costellazione:Unicorno
Ascensione retta:06h37m39.96s
Declinazione:+01°48'41.3"
Magnitudine apparente:7.782
Distanza:374.532 parsec
Moto proprio RA:0.7
Moto proprio Dec:-8.1
B-T magnitude:7.669
V-T magnitude:7.773

Cataloghi e designazioni:
Nomi esatti
HD 1989HD 47221
TYCHO-2 2000TYC 147-639-1
USNO-A2.0USNO-A2 0900-03196059
HIPHIP 31669

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