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Young massive stellar populations in M 33
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
Online publication: August 6, 1998