Astron. Astrophys. Suppl. Ser. 146, 365-372

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

III. Carina Spiral Feature

N.T. Kaltcheva^{1, 2}, E.H. Olsen², - J.V. Clausen²

Send offprint request: N. Kaltcheva

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

Received April 14; accepted July 14, 2000

Abstract:

Strömgren and H$\beta$ photometry of O and B type stars, generally brighter than 9.5 mag is reported for the field of the Carina Spiral Feature. The observations are based on the PPM catalogue identifications and are designed to improve the completeness of the existing $uvby\beta$ data for the bright early-type stars in the field. We present new uvby photometry for 283 stars and H$\beta$ photometry for 225 of them. These observations are part of an ongoing effort to study the structure of selected star-forming regions in the Milky Way by means of $uvby\beta$ photometry. A comparison of the new data to other $uvby\beta$ data sets for this field is presented.

Key words: stars: early type -- open clusters and associations: Carina Spiral Feature