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Astron. Astrophys. 352, 605-608 (1999)

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Strömgren and H[FORMULA] photometry of O and B type stars in star-forming regions

II. Monoceros OB2, Canis Major OB1 and Collinder 121 * **

N.T. Kaltcheva 1, E.H. Olsen 2 and J.V. Clausen 2

1 Department of Astronomy, University of Sofia, 5 James Bourchier Avenue, 1164 Sofia, Bulgaria (nadia@phys.uni-sofia.bg)
2 Niels Bohr Institute for Astronomy, Physics and Geophysics, Juliane Maries Vej 30, 2100 Copenhagen O, Denmark (eho,jvc@astro.ku.dk)

Received 6 August 1999 / Accepted 8 October 1999


Strömgren and H[FORMULA] photometry of O and B type stars, generally brighter than 10 mag is presented for the fields of the galactic OB associations Monoceros OB2, Canis Major OB1 and Collinder 121. The observations are based on the PPM catalogue identifications and are designed to improve the completeness of the existing [FORMULA] data for the bright early-type stars in these fields. We present new uvby photometry for 343 stars and H[FORMULA] photometry for 213 of them. These observations are part of our effort to study the structure of selected star-forming regions in the Milky Way, utilizing [FORMULA] photometry.

Key words: stars: early-type – Galaxy: open clusters and associations: individual: Mon OB2, CMa OB1, Col 121

* Based on data from the Strömgren Automatic Telescope of the Copenhagen Astronomical Observatory, La Silla.
** Tables 3 and 4 are only available in electronic form at the CDS via anonymous ftp to (ftp://cdsweb.u-strasbg.fr/pub/cats/J/A+A/352/605 ) or via http://cdsweb.u-strasbg.fr/qcat?J/A+A/352/605

Send offprint requests to: N. Kaltcheva

© European Southern Observatory (ESO) 1999

Online publication: December 2, 1999