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Uvby-beta photometry of visual double stars - Absolute magnitudes of intrinsically bright stars
Individual absolute visual magnitudes M(v) are derived for intrinsicallybright stars and evolved stars. The results are collected for 106objects believed to be members of binary systems. uvby-beta photometrywas empirically calibrated in terms of M(v) for main sequence stars andphotoelectrically determined apparent magnitudes. The derived M(v)values are not significantly different from those stated in the Wilsoncatalogue (1976). Binary systems with main sequence primaries andsecondary components off the main sequence were also investigated.Several systems in which at least one component may be in the pre-mainsequence contraction stage are pointed out. A wide variety of commentsand derived data are given individually for 136 double stars, includingmetallicities, distance moduli, and masses.
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Observation and Astrometry data
| Constellation: | いるか座 |
| Right ascension: | 20h22m13.33s |
| Declination: | +16°22'22.8" |
| Apparent magnitude: | 9.171 |
| Proper motion RA: | 1 |
| Proper motion Dec: | 3.3 |
| B-T magnitude: | 9.441 |
| V-T magnitude: | 9.194 |
Catalogs and designations:
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