## Young massive stellar populations in M 33
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.
## Contents- 1. Introduction
- 2. Correlation technique
- 3. Correlation between stellar populations in M 33
- 4. Discussion
- 5. Summary
- Acknowledgements
- Appendix A: derivation of Eq. (1)
- References
© European Southern Observatory (ESO) 1998 Online publication: August 6, 1998 |