We present optical photometry of the X-ray transient XTE J2123-058, obtained in 1998 July-October. The light curves are strongly modulated on the 5.95-h orbital period, and exhibit dramatic changes in amplitude and form during the decline. We used synthetic models, which include the effect of partial eclipses and X-ray heating effects, to estimate

The study of the Balmer radial velocity curve of the cataclysmic variable (CV) VY Scl has revealed a new value for the orbital period (0.232 days), which significantly differs from the previously accepted one. It also shows a gamma modulation that is compatible with the presence of a third component, indicating that this object could be a

A catalog of a sample of 105 Jupiter family (JF) comets (defined as those with Tisserand constants T>2 and orbital periods P

The monitoring of the column density of atmospheric sodium could be crucial for the efficiency of LGS systems. However, its detection is affected by the presence of water lines around the sodium doublet lines; this is really dramatic in the D2 line. We have developed a new method to detect the D2 sodium telluric line, obtaining previously the solar

We present a grid of theoretical models where the calculation of absorption line spectral indices in both the blue and red wavelength ranges is done with the same evolutionary synthesis code. We have computed some of these indices: CaT, Na i, Mg i in the near infrared and Mgb, Mg2, Fe52, Fe53, NaD and Hβ , in the blue-visible range, for Single

Stellar flare research is an exciting and rapidly developing field of astrophysics. The Sun is an invaluable proving ground to test predictions of flare theories and to develop analytical techniques for future stellar applications, because the lack of spatial resolution for stellar flares pushes us to extrapolate models of solar flares to the