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Centro de Astrofísica da Universidade do Porto

Stellar parameters for M dwarfs: the link to exoplanets

V. Neves, X. Bonfils, N. C. Santos

Abstract.
The determination of the metallicity of M-dwarfs is of prime importance in the fields of galactic, stellar and planetary astronomy. M stars are the least studied galactic component regarding their fundamental parameters. Yet, they are the most numerous stars in the galaxy and contribute to most of its total (baryonic) mass. Therefore, it is urgent to make new studies in order to improve and expand our knowledge of them. In this work we present a study to test and improve the metallicity scale of Bonfils et al. (2005), A&A 442,635. We further test our results against other published calibrations and investigate the star-planet connection, especially the metallicity correlation at the bottom of the main sequence.

Cool Stars 16
Seattle, U. S. A.
August 2010

Type: Poster

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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