We present the first in a series studying the astrophysical parameters of open clusters using the PPMXL database whose data are applied to study Ruprecht 15.The
Observations of an unprecedented quality made by ALMA on the Red Rectangle of CO(3–2)and CO(6–5)emissions are analysed jointly with the aim of obtaining as si
The cross-correlation between the high-redshift 21 cm background and the Soft X-ray Background(SXB) of the Universe may provide an additional probe of the Epoch