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Mass Loss from Low-Mass Giants: The Case of 47Tuc

Yazan Momany
European Southern Observatory

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.

2012 April 10, 13:30

Centro de Astrofísica da Universidade do Porto (Auditorium)
Rua das Estrelas, 4150-762 Porto

Faculdade de Ciências da Universidade de Lisboa Universidade do Porto Faculdade de Ciências e Tecnologia da Universidade de Coimbra
Fundação para a Ciência e a Tecnologia COMPETE 2020 PORTUGAL 2020 União Europeia