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HD 139011


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Starlight polarization and CO observations towards the Lupus clouds
We performed an observational study of the dark filaments Lupus 1 andLupus 4 using both polarimetric observations of 190 stars and a sampleof 72 ^12CO profiles towards these clouds. We have estimated lowerlimits to the distances of Lupus 1 and Lupus 4 (>~ 140 and >~ 125pc, respectively). The observational strategy of the survey allows us tocompare the projected magnetic field in an extended area around eachcloud with the magnetic field direction observed to prevail along theclouds. Lupus 4 could have collapsed along the magnetic field lines,while in Lupus 1 the magnetic field appears to be less ordered, havingthe major axis of the filaments parallel to the large-scale projectedmagnetic field. These differences would imply that both filaments havedifferent pattern evolutions. From the CO observations we have probedthe velocity fields of the filaments and the spatial extension of themolecular gas with respect to the dust.

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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Observation and Astrometry data

Constellation:Lupus
Right ascension:15h37m01.45s
Declination:-37°14'35.8"
Apparent magnitude:8.935
Distance:109.051 parsecs
Proper motion RA:1.9
Proper motion Dec:-30.8
B-T magnitude:9.569
V-T magnitude:8.988

Catalogs and designations:
Proper Names
HD 1989HD 139011
TYCHO-2 2000TYC 7339-1084-1
USNO-A2.0USNO-A2 0525-19842167
HIPHIP 76469

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