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35 papers · 1 filter
Astrophysical parameters of the peculiar X-ray transient IGR J11215-5952
J. Lorenzo, I. Negueruela, N. Castro +3
The hard X-ray source IGR J11215-5952 is a peculiar transient, displaying very short X-ray outbursts every 165 days. We obtained high-resolution spectra of the optical counterpart,…
Quiescent state and outburst evolution of SGR 0501+4516
A. Camero, A. Papitto, N. Rea +9
We report on the quiescent state of the Soft Gamma Repeater SGR 0501+4516 observed by XMM-Newton on 2009 August 30. The source exhibits an absorbed flux ~75 times lower than that m…
3XMM J185246.6+003317: another low magnetic field magnetar
N. Rea, D. Vigano', G. L. Israel +2
We study the outburst of the newly discovered X-ray transient 3XMM J185246.6+003317, re-analysing all available XMM-Newton, observations of the source to perform a phase-coherent t…
Planck scale physics and topology change through an exactly solvable model
Francisco S. N. Lobo, Jesus Martinez-Asencio, Gonzalo J. Olmo +1
We consider the collapse of a charged radiation fluid in a Planck-suppressed quadratic extension of General Relativity (GR) formulated à la Palatini. We obtain exact analytical sol…
The circumstellar environment and evolutionary state of the supergiant B[e] star Wd1-9
J. S. Clark, B. W. Ritchie, I. Negueruela
The location of the supergiant (sg)B[e] star Wd1-9 within the coeval starburst cluster Westerlund 1 allows for its placement in a detailed post-Main Sequence evolutionary scheme an…
IRAS 18357-0604 - an analogue of the galactic yellow hypergiant IRC +10420?
J. S. Clark, I. Negueruela, C. Gonzalez-Fernandez
Yellow hypergiants represent a short-lived evolutionary episode experienced by massive stars as they transit to and from a red supergiant phase. As such, their properties provide a…