Publications (8)
Optical observations of "hot" novae returning to quiescence
P. Zemko, S. Ciroi, M. Orio +10
We have monitored the return to quiescence of novae previously observed in outburst as supersoft X-ray sources, with optical photometry of the intermediate polar (IP) V4743 Sgr and…
Constraining the accretion geometry of the intermediate polar EX Hya using NuSTAR, Swift and Chandra observations
G. J. M. Luna, K. Mukai, M. Orio +1
In magnetically accreting white dwarfs, the height above the white dwarf surface where the standing shock is formed is intimately related with the accretion rate and the white dwar…
V4743 Sgr, a magnetic nova?
P. Zemko, M. Orio, K. Mukai +3
Two XMM Newton observations of Nova V4743 Sgr (Nova Sgr 2002) were performed shortly after it returned to quiescence, 2 and 3.5 years after the explosion. The X-ray light curves re…
CXO J004318.8+412016, a steady supersoft X-ray source in M 31
M. Orio, G. J. M. Luna, R. Kotulla +14
We obtained an optical spectrum of a star we identify as the optical counterpart of the M31 Chandra source CXO J004318.8+412016, because of prominent emission lines of the Balmer s…
What we learn from the X-ray grating spectra of Nova SMC 2016
M. Orio, J. -U. Ness, A. Dobrotka +17
Nova SMC 2016 has been the most luminous nova known in the direction of the Magellanic Clouds. It turned into a very luminous supersoft X-ray source between day 16 and 28 after the…
Multi-mission observations of the old nova GK Per during the 2015 outburst
P. Zemko, M. Orio, G. J. M. Luna +3
GK Per, a classical nova of 1901, is thought to undergo variable mass accretion on to a magnetized white dwarf (WD) in an intermediate polar system (IP). We organized a multi-missi…
Chemical and physical parameters from X-ray high resolution spectra of the Galactic nova V959 Mon
U. Peretz, M. Orio, E. Behar +5
Two observations of V959 Mon, done using the Chandra X-ray gratings during the late outburst phases (2012 September and December), offer extraordinary insight into the physics and…
X-ray observations of VY Scl type nova-like binaries in the high and low state
P. Zemko, M. Orio, K. Mukai +1
Four VY Scl-type nova-like systems were observed in X-rays during both the low and the high optical states. We examined Chandra, ROSAT, Swift and Suzaku archival observations of BZ…