88 citations · 146 across the 6 of their papers we have counts for
6 papers
Cosmology and Astrophysics without Dark Energy and Dark Matter
Shlomo Barak, Elia M Leibowitz
We show that there is no need for the hypothetical Dark Energy (DE) and Dark Matter (DM) to explain phenomena attributed to them. In contrast to the consensus of the last decade, w…
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…