Astron. Astrophys. 352, 600-604 (1999)

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

I. Canis Major - Puppis - Vela ^* **

N.T. Kaltcheva ¹ and E.H. Olsen <sup>2

1</sup> Department of Astronomy, University of Sofia, 5 James Bourchier Ave, 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@astro.ku.dk)

Received 6 August 1999 / Accepted 8 October 1999

Abstract

Strömgren and H photometry of OB-stars generally brighter than 9.5 mag in the Canis Major - Puppis - Vela region of Milky Way is reported. The observations are based on the Milky Way luminous-star (LS) identifications and are designed to create a complete, magnitude-limited sample of LS for this field. We present new uvby photometry for 127 LS and H photometry for 25 of them. These observations are part of an ongoing effort to improve the completeness of the existing data-base for the bright OB-type stars in the Milky Way, with the aim to investigate the structure of selected star-forming regions.

Key words: stars: early-type

* 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 130.79.128.5 (ftp://cdsarc.u-strasbg.fr/pub/cats/J/A+A/352/600 ) or via http://cdsweb.u-strasbg.fr/cgi-bin/qcat?J/A+A/352/600

Send offprint requests to: N. Kaltcheva

SIMBAD Objects

Contents

• 1. Introduction
• 2. Observing program
• 3. Observations and reductions
  • 3.1. Observing procedures
  • 3.2. Instrumental systems
  • 3.3. Transformations to the standard systems
• 4. Results
• Acknowledgements
• References

© European Southern Observatory (ESO) 1999

Online publication: December 2, 1999
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