The small imaging photometer of the VIRGO (Variability in IRradiance and Gravity Oscillations) investigation on ESA's SOHO mission is presented. This instrument, the Luminosity Oscillations Imager (LOI), will observe the solar radiance with 12 pixels resolution. A prototype of the LOI was built mainly to test possible detector configurations, the

We propose to use the OSIRIS tunable filters to perform for the first time a systematic study of the environment of Radio Loud and Radio Quiet quasars in windows around a large range of redshifts (z ~ 2 to 4). The aim of our study is (1) to search for the presence of forming clusters of galaxies around quasars, through Ly α emitters, which in turn

In this paper we discuss the detection of Ly α galaxies at 4.6 ≳ z ≳ 6.6 within the OTELO survey. We estimate the expected number of objects that will be found in this survey.

A sounding-rocket program called the Chromospheric Lyman-Alpha Spectro-Polarimeter (CLASP) is proposed to be launched in the Summer of 2014. CLASP will observe the upper solar chromosphere in Ly-alpha (121.567 nm), aiming to detect the linear polarization signal produced by scattering processes and the Hanle effect for the first time. The CLASP

We have obtained HST-NICMOS observations of five of M31's most metal rich globular clusters: G1, G170, G174, G177 & G280. In order to disentangle the true properties of the population from the observational effects associated with measurements made in very crowded fields, we first present a careful analysis of photometry in crowded regions. Here we

The Andromeda Galaxy recurrent nova M31N 2008-12a had been observed in eruption 10 times, including yearly eruptions from 2008 to 2014. With a measured recurrence period of {P}{rec}=351+/- 13 days (we believe the true value to be half of this) and a white dwarf very close to the Chandrasekhar limit, M31N 2008-12a has become the leading pre