Detection of period variations in extrasolar transiting planet OGLE-TR-111b (2008)
Díaz, Rodrigo F., Rojo, Patricio, Melita, Mario, Hoyer, Sergio, Minniti, Dante, Mauas, Pablo J. D., ...
Two consecutive transits of planetary companion OGLE-TR-111b were observed in the I band. Combining these observations with data from the literature, we find that the timing of the transits cannot be...
The spectroscopic binary system Gl 375. I. Orbital parameters and chromospheric activity (2007)
Díaz, Rodrigo F., González, Jorge F., Cincunegui, Carolina, Mauas, Pablo J. D.
We study the spectroscopic binary system Gl 375. We employ medium resolution echelle spectra obtained at the 2.15 m telescope at the Argentinian observatory CASLEO and photometric observations...
The Na I D resonance lines in main sequence late-type stars (2007)
Díaz, Rodrigo F., Cincunegui, Carolina, Mauas, Pablo J. D.
We study the sodium D lines (D1: 5895.92 \AA; D2: 5889.95 \AA) in late-type dwarf stars. The stars have spectral types between F6 and M5.5 (B-V between 0.457 and 1.807) and metallicity between [Fe/H]...
Fluxes in H\alpha and Ca II H and K for a sample of Southern stars (2007)
Cincunegui, Carolina, Díaz, Rodrigo F., Mauas, Pablo J. D.
The main chromospheric activity indicator is the S index, which is esentially the ratio of the flux in the core of the Ca II H and K lines to the continuum nearby, and is well studied basically for...
A possible activity cycle in Proxima Centauri (2007)
Cincunegui, Carolina, Díaz, Rodrigo F., Mauas, Pablo J. D.
Several late-type stars present activity cycles resembling the Solar one. This fact has been observed mostly in stars ranging from F to K, i.e., in stars with a radiative core and an outer convective...
Díaz, Rodrigo F., Ramírez, Sebastián, Fernández, José Miguel, Gallardo, José, Gieren, Wolfgang, Ivanov, Valentin D., ...
We present precise V and Ks-band transit photometry for the planetary host star OGLE-TR-113. Using the Ks-band photometry, we confirm the dwarf nature of OGLE-TR-113, and obtain new estimates for its...
Minniti, Dante, Fernández, José Miguel, Díaz, Rodrigo F., Udalski, Andrzej, Pietrzynski, Grzegorz, Gieren, Wolfgang, ...
We present accurate V-band photometry for a planetary transit of OGLE-TR-111 acquired with VIMOS at the ESO Very Large Telescope. The measurement of this transit allows to refine the planetary...