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HD 40591


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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.

Interaction between the Barnard Loop Nebula and the interstellar magnetic field
New observations of the linear interstellar polarization of starlightare used to study the geometric structure of the interstellar magneticfield in the vicinity of the Barnard Loop Nebula in Orion. The observedcomplex field structure cannot be explained by a simple radial expansionof a conducting gaseous shell into an initially parallel field. Asatisfactory fit of the observations can be obtained by assuming thatthe interstellar gas in Orion is suspended in an interstellar 'magneticpocket'. It is suggested that the formation of the observed denseinterstellar clouds and very young stars in the Orion aggregate is aresult of the local structure of the interstellar magnetic field.

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Osservazione e dati astrometrici

Costellazione:Orione
Ascensione retta:05h59m43.41s
Declinazione:-02°20'08.8"
Magnitudine apparente:8.638
Distanza:534.759 parsec
Moto proprio RA:-7
Moto proprio Dec:1.5
B-T magnitude:8.612
V-T magnitude:8.636

Cataloghi e designazioni:
Nomi esatti   (Edit)
HD 1989HD 40591
TYCHO-2 2000TYC 4773-476-1
USNO-A2.0USNO-A2 0825-01825208
HIPHIP 28381

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