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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.
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Gözlemler ve gökölçümü verileri
| Takýmyýldýz: | Irmak |
| Sað Açýklýk: | 03h41m38.07s |
| Yükselim: | -00°09'48.9" |
| Görünürdeki Parlaklýk: | 8.65 |
| Uzaklýk: | 172.712 parsek |
| özdevim Sað Açýklýk: | -12.7 |
| özdevim Yükselim: | -11.4 |
| B-T magnitude: | 8.913 |
| V-T magnitude: | 8.672 |
Kataloglar ve belirtme:
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