By Jose Afonso, Nuno Santos, Andre Moitinho, Rui Agostinho
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Additional resources for 2005: Past Meets Present in Astronomy And Astrophysics: Proceedings of the 15th Portuguese National Meeting
I n t r o d u c t i o n Environment strongly affects the properties of galaxies, eg. cluster and field galaxies reveal different stellar populations. This can be due to the different morphological mix 3 . W h e t h e r this mix is driven by environment or set by the initial density conditions of the region where the galaxies are b o r n is another issue. Looking at morphology and star formation history can help to shed light on this question. This paper presents preliminary results on the study of galaxy spectral classes for 3 clusters at intermediate-z, with the aim of contributing to this fascinating topic.
The field opens up at r=3R«. 4. Discussion and conclusions We show that very different surface flux distributions give rise to similar coronal fields. For surface fields concentrated near the poles, the field lines that emerge at high latitudes are driven towards low latitudes. Physically, this is simply a consequence of the very large magnetic pressure difference between high and low latitudes. Therefore, a strong field near the pole and a weak field near the equator at the stellar surface do not imply a strong field near the pole and a weak field near the equator in the corona.
E. Schatzman Ann. Astrophys. 25, 18 (1962). S. A. Barnes and S. Sofia, ApJ462, 746 (1996). K. B. Macgregor and M. Brenner, ,4pJ376, 204 (1991). S. K. Solanki, S. Motamen and R. Keppens, A&A 325, 1039 (1997). D. L. Buzasi, ApJ 484, 855 (1997). B. C. Low, ApJ 310, 953 (1986). L. Mestel, MNRAS 138, 359 (1968). A. Aibeo, J. M. Ferreira and J. Lima, in preparation. A F I R S T S T E P FOR AUTOMATIC STELLAR P A R A M E T E R DETERMINATION S. G. S O U S A Observatorio Astronomico de Lisboa, Tapada da Ajuda, 1349-018 Lisboa, Portugal & Centro de Astrofisica da Universidade do Porto, Rua das Estrelas, 4150-762 Porto, Portugal T h e determination of stellar parameters is essential for the study of stellar astrophysics.
2005: Past Meets Present in Astronomy And Astrophysics: Proceedings of the 15th Portuguese National Meeting by Jose Afonso, Nuno Santos, Andre Moitinho, Rui Agostinho