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HD 138910


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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:Norma
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:
Proper Names
HD 1989HD 138910
TYCHO-2 2000TYC 8708-947-1
USNO-A2.0USNO-A2 0300-24193246
HIPHIP 76554

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