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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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Observation and Astrometry data
| Constellation: | Ophiucus |
| Right ascension: | 17h29m37.02s |
| Declination: | +01°33'18.9" |
| Apparent magnitude: | 8.125 |
| Distance: | 431.034 parsecs |
| Proper motion RA: | -3.1 |
| Proper motion Dec: | -10.3 |
| B-T magnitude: | 8.209 |
| V-T magnitude: | 8.132 |
Catalogs and designations:
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