Forum Springer Astron. Astrophys.
Forum Whats New Search Orders

Astron. Astrophys. 337, 39-42 (1998)

Next Section Table of Contents

Young massive stellar populations in M 33

G.R. Ivanov

Department of Astronomy, Sofia University, 5 James Bourchier Avn., BG-1164 Sofia, Bulgaria

Received 7 October 1997 / Accepted 27 March 1998


In this paper we estimate the ratio OB stars to red supergiants (OB/R) as a function of the distance from the centre of M 33. We found a gradient of the ratio (OB/R) really exists. Our study is based on a new approach in estimating the errors on the ratio (OB/R). On the other hand, by applying a new correlation technique between OB star candidates and red supergiant candidates in the central region of M 33, the gradient becomes pronounced. Our results confirm the existence of such a gradient and we consider this fact as a consequence of a similar gradient of the chemical abundance in M 33.

Key words: methods: data analysis – stars: supergiants – galaxies: M 33 – galaxies: stellar content

Send offprint requests to: G.R. Ivanov

SIMBAD Objects


Next Section Table of Contents

© European Southern Observatory (ESO) 1998

Online publication: August 6, 1998