21 citations · 44 across the 5 of their papers we have counts for
5 papers
Testing the accuracy of Coimbra Astronomical Observatory solar filament historical series (1929-1941)
Ana Lourenço, Ricardo Gafeira, Vitor Bonifacio +3
The present work aims to validate the positions of solar filaments published in the Annals of Coimbra University Astronomical Observatory, currently the Geophysical and Astronomica…
Revisiting the mass- and radius-luminosity relations for FGK main-sequence stars
João Fernandes, Ricardo Gafeira, Johannes Andersen
Scaling relations are very useful tools for estimating unknown stellar quantities. Within this framework, eclipsing binaries are ideal for this goal because their mass and radius a…
Temporal Evolution of Sunspot Areas and Estimation of Related Plasma Flows
R. Gafeira, C. C. Fonte, M. A. Pais +1
The increased amount of information provided by ongoing missions such as the Solar Dynamics Observatory (SDO) represents a great challenge for the understanding of basic questions…
Variation rate of sunspot area
R. Gafeira, C. C. Fonte, M. A. Pais +1
The emergence of the magnetic field through the photosphere has multiple manifestations and sunspots are the most prominent examples of this. One of the most relevant sunspot prope…
Mass-luminosity relation for FGK main sequence stars: metallicity and age contributions
Ricardo Gafeira, Carlos Patacas, João Fernandes
The stellar mass-luminosity relation (MLR) is one of the most famous empirical "laws", discovered in the beginning of the 20th century. MLR is still used to estimate stellar masses…