88 citations · 146 across the 6 of their papers we have counts for
5 papers · 1 filter
On Dark Energy and Dark Matter (Part I)
Shlomo Barak, Elia M Leibowitz
Phenomena currently attributed to Dark Energy (DE) and Dark Matter (DM) are merely a result of the interplay between gravitational energy density, generated by the contraction of s…
Activity cycle of the giant star of Z Andromedae and its spin period
Elia M. Leibowitz, Liliana Formiggini
We have reanalyzed the long-term optical light curve (LC) of the symbiotic star Z Andromedae, covering 112--yr of mostly visual observations. Two strictly periodic and one quasi-pe…
X-ray Spectroscopy of the 2006 Outburst of RS Oph
Thomas Nelson, Marina Orio, Joseph P. Cassinelli +3
We present the X-ray grating spectra of the recurrent nova RS Ophiuchi during its 2006 outburst, obtained with the XMM-Newton and Chandra observatories. Two weeks after optical max…
The giant star of the symbiotic system YY Her: Rotation, Tidal wave, Solar-type cycle and Spots
Liliana Formiggini, Elia M. Leibowitz
We analyze the historical light curve of the symbiotic star YY Her, from 1890 up to December 2005. A secular declining trend is detected, at a rate of ~.01 magn in 1000 d, suggesti…
Variability and multi-periodic oscillations in the X-ray light curve of the classical nova V4743 Sgr
E. Leibowitz, M. Orio, R. Gonzalez-Riestra +5
The classical nova V4743 Sgr was observed with XMM-Newton for about 10 hours on April 4 2003, 6.5 months after optical maximum. At this time, this nova had become the brightest sup…