We present the discovery of an L0 companion to the nearby M1.5 dwarf G 239-25, at a projected distance of 31 AU. It is the faintest companion discovered so far...
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PublicaciónAn L0 dwarf companion in the brown dwarf desert, at 30 AU
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PublicaciónApplications of image sharpening techniques. I - Nebular structure in H-alpha of AG Peg
H-alpha observations of AG Peg, obtained using an IPCS detector on the 2.5-m Isaac Newton Telescope of the Observatorio del Roque de Los Muchachos on November...
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PublicaciónAre Q-stars a serious threat for stellar-mass black hole candidates?
We examine the status of the threat posed to stellar-mass black hole candidates by the possible existence of Q-stars (compact objects with an exotic equation of...
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CongresoBinarias eclipsantes y astrosismología
Gracias a las numerosas misiones públicas, espaciales y terrestres de seguimiento, activas o recientemente finalizadas, nunca antes se había dispuesto de tal...
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PublicaciónBlue stragglers - A search for binaries in the infrared
Infrared photometry in the J, H and K bands, performed on a sample of 33 blue stragglers (BS) belonging to 8 open clusters is presented. This photometry has...
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PublicaciónBlue stragglers and the binary hypothesis
An observational test of the binary hypothesis for the origin of blue straggler stars is conducted by searching for radial velocity variables among 30 blue...
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PublicaciónBlue stragglers in open clusters - A test of the binary hypothesis
A search for binaries among 17 blue stragglers in five galactic clusters, NGC 7789, 6633, 6819, 6939, and M 67, has been performed using measurements of radial...
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PublicaciónCircumstellar matter around the RS CVn system II Peg
The RS CVn noneclipsing system II Peg has been observed in the J, H, K, L, and M infrared bands along a complete period. The shape of the light curve shows an...
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PublicaciónClose Binary Companions to APOGEE DR16 Stars: 20,000 Binary-star Systems Across the Color-Magnitude Diagram
Many problems in contemporary astrophysics—from understanding the formation of black holes to untangling the chemical evolution of galaxies—rely on knowledge...