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Uvby-beta observations of 528 type B stars with V between the 8th and 9th magnitude
The paper presents uvby-beta measurements of 528 type B stars selectedfrom the SAO Catalog on the basis of two criteria: the spectral types inthe range B3-B5 and mV between the 8th and the 9th magnitude. Reddeningindependent (c1) values are estimated from the spectral classificationand compared to the observed values. No systematic trend with observed(b-y), H-beta, or spectral type appears to be present, but the range of(c1) residuals is surprisingly large. A rather large part of the starshas small beta values, smaller than for the BIa supergiants. Only twoare classified as O stars and most of them have the suffix e, ne, ornne. Most beta values for the O type stars are slightly above the upperlimit of 2.585 m.
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Observation and Astrometry data
| Constellation: | Orion |
| Right ascension: | 06h15m18.77s |
| Declination: | +05°52'13.5" |
| Apparent magnitude: | 9.812 |
| Proper motion RA: | -2.4 |
| Proper motion Dec: | -1.6 |
| B-T magnitude: | 9.921 |
| V-T magnitude: | 9.821 |
Catalogs and designations:
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