OO Ser is a deeply embedded young star which brightened by 5 mag between 1994 and 1995, and gradually faded afterwards. In many respects its eruption resembled...

The authors present preliminary results of an infrared monitoring program of selected blazars, conducted at the Carlos Sanches Telescope at Izana Observatory...

The authors present accurate positions and near infrared photometry of 11 point-like objects in the neighbourhood of GGD objects.

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Infrared observations of symbiotic stars, together with simultaneous optical and ultraviolet observations are demonstrated to be a powerful tool for the...

We obtained simultaneously recorded time series of broadband images of a sunspot close to the disk center at the German Vacuum Tower Telescope, Tenerife, in two...

A time series of broadband images of a sunspot near the disk center was obtained simultaneously in two wavelength bands at 0.56 mu m and 1.55 mu m at the German...

New infrared photometry of a sample of 39 stars in the open cluster NGC 752 is presented. These observations confirm the bimodality of the main sequence...

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