We present the results of time‐resolved optical photometry and spectroscopy of the X‐ray transient XTE J1859+226 (V406 Vul). Photometric observations taken...

Using HST emission line images of the Orion Nebula, separated by 7 years in epoch, we have obtained evidence of localized temporal variability of both density...

"The famous astronomer Jean Mascart of the Paris Observatory came to Tenerife in 1910 along with other scientists to carry out various studies, including the...