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Determination of fundamental parameters of (chemically peculiar) A stars through optical interferometry

K. Perraut, M. S. Cunha, D. Mourard, N. Nardetto

The direct measurement of stellar diameters is fundamental for determining properties of stars, in particuliar the linear radius and the effective temperature. Those properties provide the link between the theory of stellar structure and evolution, and model atmospheres. For nearby main-sequence stars, whose distances are well known, the angular diameters are difficult to measure owing to their small sizes compared to their evolved counterparts. Recently, high angular resolution provided by long-baseline optical interferometry has enabled the photospheric disk of such nearby stars to be resolved and their angular diameters to be measured. These measurements have provided clues for studying the physical processes (such as convection, rotation, and pulsations) that are at play in the A stars. After a brief explanation of the long-baseline interferometry principle, we present recent studies based on the determination of fundamental parameters of A stars. Within this context, we emphasize the strong interest of combining interferometry and asteroseismology for pulsating A stars.

Putting A Stars into Context: Evolution, Environment, and Related Stars
G. Mathys, E. Griffin, O. Kochukhov, R. Monier, G. Wahlgren

PERO Publishing, Page 120
2014 November

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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