Search Publications
X-rays and TESS observations of symbiotic binary stars
Nuñez, N. E.; Mukai, K.; Sokoloski, J. L. +5 more
Symbiotic stars are strongly interacting binaries composed of a white dwarf accreting from its red giant companion. We studied five symbiotics stars: BD~Cam, V1261~Ori, NQ~Gem, CD~-27~8661, CD~-36~8436 using observations from the Swift/XRT and XMM-Newton satellites in X-rays and from TESS in the optical. The X-ray spectra were fit with absorbed op…
X-ray emission from the microquasar S26 observed by XMM-Newton
Romero, G. E.; Rizzo, F. N.; Sotomayor Checa, P.
S26 is the microquasar with the most powerful jets observed in accreting stellar sources. The estimated kinetic power for its jets is of the order of the bolometric luminosity of some ultraluminous X-ray sources. If this power is coupled to the matter accretion onto the compact object, then S26 must be a super-accreting binary, similar to the gala…
Observaciones del remanente de supernova G296.5+10.0 con el satélite XMM-Newton
Combi, J. A.; Eppens, L. K.; Reynoso, E. M.
G296.5+10.0 is a 90' × 65'-size supernova remnant (SNR) that displays a bilateral distribution in the radio band with the symmetry axis perpendicular to the Galactic Plane. The remnant shows two emission peaks at the South-East and South-West of the radio shell. In addition, the EXOSAT instrument detected an extended X-ray plasma with an axisymmet…
Interacción entre el RSN G359.1-0.5 y el medio interestelar
Combi, J. A.; Eppens, L. K.; Reynoso, E. M. +1 more
G359.1-0.5 is a supernova remnant near the Galactic center region that belongs to the mixed morphology type, showing a radio continuum shell and diffuse thermal X-ray emission inside. Earlier molecular studies around the location of G359.1-0.5 revealed an annular CO structure in the velocity range from $-190$ to $-60~\rm{km} \rm{s}^{-1}$ with an H…
Accretion disks in symbiotic stars
Luna, G. J. M.
The nature of accretion in symbiotic binaries, in which the red giant transfers material to a white dwarf (WD) companion, has been difficult to uncover. The accretion flows in a symbiotic binary are most clearly observable, however, when there is no quasi-steady shell burning on the WD to hide them. Through observations in the high energy regime, …
Análisis temporal y espectral en rayos X de la fuente IGR J16320-4751
Chaty, S.; García, F.; Fogantini, F. +1 more
We present the results obtained from an in depth timing and spectral analysis of IGR J16320-4751, a High Mass X-ray binary system comprised of a neutron star orbiting and accreting matter from the stellar wind of its supergiant companion. From a total of nine XMM-Newton observations, we computed and analyzed the time evolution of physical paramete…
Estudio de fuentes de rayos X asociadas a la fuente de rayos γ no identificada 2FGL J0534.8-0548
Combi, J. A.; García, F.; Kornecki, P.
In this paper, we present a preliminary study of four point-like X-ray sources detected with XMM-Newton. Three of them lie within the ellipse corresponding to the 95 confidence contour of the unidentified -ray source 2FGL J0534.80548c, detected with the Fermi telescope. The fourth, named 2XMM J053514.8055143 and identified with a binary system, is…
Observaciones combinadas XMM-Newton/Chandra del remanente de supernova G306.3-0.9
Filócomo, A.; Combi, J. A.; García, F. +3 more
In this paper we study the spatial and spectral distribution of the physical and chemical properties of the supernova remnant G306.3-0.9 by using data of the X-rays telescopes XMM-Newton and Chandra, which we complement with radio and infrared information in order to study the morphology of the source and the effect of the shock wave in the intere…
Detección de la estrella simbiótica Hen 2-87 en rayos X con XMM-Newton
Luna, G. J. M.; Nuñnez, N. E.
Symbiotic stars are interacting binary systems, where accretion, most of the times, occurs onto a white dwarf. Until recently only a couple of dozens of symbiotics were known to be X-ray emitters, with most of the emission having energies of less than about 2.00 keV. In the last decade, with the launch of modern X-ray satellites such as XMM-Newton…
Is there a Central Compact Object within G290.1--0.8?
Bocchino, F.; Combi, J. A.; García, F. +3 more
We study the central region of the supernova remnant (SNR) G290.1--0.8 in order to search for a possible compact stellar remnant associated to it. Our analysis of XMM-Newton and Chandra archival observations reveals three point-like sources. Two of them are hard X-ray sources, possibly Active Galactic Nuclei. The third one, located very close to t…