We consider the effect of uncertainties in solar models on the p-mode frequencies of moderate degree (40 l 100). This is done by means of an asymptotic relation...

Scattering of line photons by ambient electrons in thermal motion in the stellar atmosphere modifies the wings of both intensity and linear polarization...

Gaia Data Release 3 has provided the astronomical community with the largest stellar spectroscopic survey to date (> 220 million sources). The low resolution (R...

We present results from five nights of pseudo-simulations JHK infrared monitoring of the blazar OJ 287 taken with the Carlos Sanchez Telescope during March 1991...

We report unusual near- and mid-infrared photometric properties of G 196-3 B, the young substellar companion at 16'' from the active M2.5-type star G 196-3 A...

Microvariability observations of two TeV emitting blazars have been made from the Canary Islands International Observatories since 1990. We present a small...

We performed J- and R-band linear polarimetry with the 4.2 m William Herschel Telescope at the Observatorio del Roque de los Muchachos and with the 1.6 m...

Infrared photometry in J,H,K,L,M bands carried out in different years from 1983 to 1986, and U,B,V,R,I quasi-simultaneous to 1984 are presented. Although the...

We present measurements of the atmospheric water vapour content above the Roque de los Muchachos Observatory (ORM) obtained using the Global Positioning System...