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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: | Règle |
| Right ascension: | 15h38m04.14s |
| Declination: | -59°52'35.9" |
| Apparent magnitude: | 8.036 |
| Distance: | 2222.222 parsecs |
| Proper motion RA: | -2.1 |
| Proper motion Dec: | -4.9 |
| B-T magnitude: | 8.124 |
| V-T magnitude: | 8.044 |
Catalogs and designations:
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