We present BVR photometric observations of the blazar PKS 0736+017. These observations were carried out with three telescopes in Mexico and two in Spain between...
Optical variability of the blazar 3C 371: From minute to year timescales
Context. The BL Lac object 3C 371 was observed by the Transiting Exoplanet Survey Satellite (TESS) for approximately a year, between July 2019 and July 2020...
Optical/infrared observations of the X-ray burster KS1731-260 in quiescence
Aims: We performed an optical/infrared study of the counterpart of the low-mass X-ray binary KS 1731-260 to test its identification and obtain information about...
Optical/X-ray/radio view of Abell 1213: A galaxy cluster with anomalous diffuse radio emission
Context. Abell 1213, a low-richness galaxy system, is known to host an anomalous radio halo detected in data of the Very Large Array (VLA). It is an outlier...
Optimising and comparing source-extraction tools using objective segmentation quality criteria
Context. With the growth of the scale, depth, and resolution of astronomical imaging surveys, there is increased need for highly accurate automated detection...
Optimization with numerical simulations of the conjugate altitudes of deformable mirrors in an MCAO system
This article reports on the results of simulations conducted to assess the performance of a modal Multi-Conjugate Adaptive Optics (MCAO) system on a 10 m...
Orbital and physical properties of planets and their hosts: new insights on planet formation and evolution
Aims: We explore the relations between physical and orbital properties of planets and properties of their host stars to identify the main observable signatures...
Orbital decomposition of the nuclear regions in the early-type galaxy FCC 47: Unveiling the nuclear cluster origin
Context. Nuclear star clusters (NSCs) are among the densest stellar systems in the Universe and often coexist with supermassive black holes (SMBHs) at galaxy...
Orbital periods of cataclysmic variables identified by the SDSS. VI. The 4.5-h period eclipsing system SDSS J100658.40+233724.4
We present time-resolved spectroscopy and photometry of SDSS J100658.40+233724.4, which we have discovered to be an eclipsing cataclysmic variable with an...