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Centro de Astrofísica da Universidade do Porto
Mass Loss from Low-Mass Giants: The Case of 47Tuc

Yazan Momany
European Southern Observatory

Abstract
Low-mass stars can lose a quite significant portion of their mass during their red giant branch ascent. This affects the successive evolution of the stars. A recent Spitzer investigation of 47Tuc has suggested that Mass Loss along the giant branch is not limited to the tip level (as in the Reimers law) but rather is an extended process affecting stars as faint as the horizontal branch level. In this talk I will present a recent VISIR@VLT investigation addressing this issue. We find evidence supporting the classical Reimers formulation, limiting the mass-loss to the brightest giant stars.

10 April 2012, 13:30

Centro de Astrofísica
Rua das Estrelas
4150-762 Porto

Institute of Astrophysics and Space Sciences

Institute of Astrophysics and Space Sciences (IA) is a new but long anticipated research infrastructure with a national dimension. It embodies a bold but feasible vision for the development of Astronomy, Astrophysics and Space Sciences in Portugal, taking full advantage and fully realizing the potential created by the national membership of the European Space Agency (ESA) and the European Southern Observatory (ESO). IA resulted from the merging the two most prominent research units in the field in Portugal: the Centre for Astrophysics of the University of Porto (CAUP) and the Center for Astronomy and Astrophysics of the University of Lisbon (CAAUL). It currently hosts more than two-thirds of all active researchers working in Space Sciences in Portugal, and is responsible for an even greater fraction of the national productivity in international ISI journals in the area of Space Sciences. This is the scientific area with the highest relative impact factor (1.65 times above the international average) and the field with the highest average number of citations per article for Portugal.

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