Effects of convective overshooting in the PMS evolution of intermediate mass stars

• Type: Article in International Conference Proceedings Book
• Date: 2005

Authors

Marques, JP (Author) Other; Monteiro, MJPFG (Author) FCUP; Fernandes, J (Author) Other

Conference proceedings International

Title: Proceedings of the 13th Cambridge Workshop on Cool Stars, Stellar Systems and the Sun - Proceedings, Vols 1 and 2

Pages: 795-798

13th Cambridge Workshop on Cool Stars, Stellar Systems and the Sun

Hamburg, GERMANY, JUL 05-09, 2004

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Scientific classification

FOS: Natural sciences > Physical sciences

Other information

Authenticus ID: P-000-6GA

Abstract (EN): We discuss the new results on the effects of convective overshooting in the PMS evolution of intermediate mass stars. These effects are extremely important in the end of the PMS, when the abundances in CNO elements approach the equilibrium in the centre. A moderate amount of overshooting produces, as the star approaches the ZAMS, an extra loop in the evolutionary tracks on the HR diagram; the amount of overshooting needed to produce the loop decreases with the stellar mass. An interesting feature is that there is a very well defined amount of overshooting (for a given stellar mass and chemical composition) beyond which a loop is produced; for smaller amounts of overshooting such a loop does not take place and the evolutionary tracks are similar to the ones obtained by Then (1965). We discuss the reasons for this behaviour and argue that it can provide a crucial observational test for convective overshooting in the core of intermediate mass stars.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 4