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A catalog of rotational and radial velocities for evolved stars V. Southern stars
J. R. De Medeiros, S. Alves, S. Udry +3
Rotational and radial velocities have been measured for 1589 evolved stars of spectral types F, G and K and luminosity classes IV, III, II and Ib, based on observations carried out…
New Suns in the Cosmos?
D. B. de Freitas, I. C. Leão, C. E. F. Lopes +5
The present work reports on the discovery of three stars that we have identified to be rotating Sun-like stars, based on rotational modulation signatures inferred from light curves…
Overview of semi-sinusoidal stellar variability with the CoRoT satellite
J. R. De Medeiros, C. E. Ferreira Lopes, I. C. Leao +13
To date, the CoRoT space mission has produced more than 124,471 light curves. Classifying these curves in terms of unambiguous variability behavior is mandatory for obtaining an un…
A nonextensive approach to the stellar rotational evolution I. F and G type stars
D. B. de Freitas, J. R. De Medeiros
The pioneering study by Skumanich (1972) showed that the rotational velocity of G-type Main-Sequence (MS) stars decreases with stellar age according to $t^{-…
Fundamental properties of nearby stars and the consequences on DeltaY/DeltaZ
Aldo A. R. Valcarce, Márcio Catelan, José R. De Medeiros
One of the greatest difficulties in astrophysics is the determination of the fundamental stellar parameters (FSPs), one of which is the initial mass fraction of helium (Y). However…