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The 2006 hot phase of Romano's star (GR 290) in M33
R. F. Viotti, S. Galleti, R. Gualandi +4
Understanding the nature of the instabilities of LBVs is important to understand the late evolutionary stages of very massive stars. We investigate the long term, S Dor-type variab…
3C 345: the historical light curve (1967-1990) from the digitized plates of the Asiago Observatory
A. Omizzolo, C. Barbieri, C. Rossi
In the frame of a large project to digitize the plate archives of the Italian and Vatican Astronomical Observatories, we have already performed the digitization of all available pl…
A study of the expanding envelope of Nova V1974 Cyg 1992 based on IUE high resolution spectroscopy
A. Cassatella, H. J. G. L. M. Lamers, C. Rossi +2
We have carried out a detailed analysis of the IUE archival high resolution spectra of the classical nova V1974 Cyg 1992. In addition to the P Cygni and emission lines, two shortwa…
The high energy X-ray tail of Eta Car revealed by BeppoSAX
R. F. Viotti, L. A. Antonelli, C. Rossi +1
We report on the June 2000 long (100 ks) BeppoSAX exposure that has unveiled above 10 keV a new very high energy component of the X-ray spectrum of Eta Car extending to at least 50…
Digitatio and Scientific Exploitation of the Italian and Vatican Astronomical Plate Archives
C. Barbieri
There is a widespread interest to digitize the precious information contained in the astronomical plate archives, both for the preservation of their content and for its fast distri…