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HD 257662


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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.

Walraven photometry of nearby southern OB associations
Homogeneous Walraven (VBLUW) photometry is presented for 5260 stars inthe regions of five nearby southern OB associations: Scorpio Centaurus(Sco OB2), Orion OB1, Canis Major OB1, Monoceros OB1, and Scutum OB2.Derived V and (B - V) in the Johnson system are included.

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Сазвежђа:Једнорог
Ректацензија:06h27m38.51s
Deклинација:+09°12'35.8"
Apparent магнитуда:9.509
Proper motion RA:-1.6
Proper motion Dec:-2.5
B-T magnitude:9.654
V-T magnitude:9.521

Каталог и designations:
Proper имена   (Edit)
HD 1989HD 257662
TYCHO-2 2000TYC 732-3290-1
USNO-A2.0USNO-A2 0975-03252257
HIPHIP 30746

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