Available formats: HTML | PDF | (gzipped) PostScript
Strömgren and H photometry of O and B type stars in star-forming regions
N.T. Kaltcheva 1,
E.H. Olsen 2 and
J.V. Clausen 2
Received 6 August 1999 / Accepted 8 October 1999
Strömgren and H 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 data for the bright early-type stars in these fields. We present new uvby photometry for 343 stars and H 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 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.
Send offprint requests to: N. Kaltcheva
Online publication: December 2, 1999