Search Publications
On the distance of PG 1553+11 . A lineless BL Lacertae object active in the TeV band
Falomo, R.; Uslenghi, M.; Treves, A.
Context: The redshift of
Aims: We intend to provide a lower limit for the distance of the object.
Methods: We used a χ2 procedure to constrain…
Fundamental parameters of He-weak and He-strong stars
Frémat, Y.; Zorec, J.; Arias, M. L. +3 more
Context: He-weak and He-strong stars are chemically peculiar AB objects whose He lines are anomalously weak or strong for their MK spectral type. The determination of fundamental parameters for these stars is often more complex than for normal stars due to their abundance anomalies.
Aims: We discuss the determination of fundamental parameters:…
Sensitivity of low degree oscillations to the change in solar abundances
Provost, J.; Berthomieu, G.; Morel, P. +2 more
Context: The most recent determination of the solar chemical composition, using a time-dependent, 3D hydrodynamical model of the solar atmosphere, exhibits a significant decrease of C, N, O abundances compared to their previous values. Solar models that use these new abundances are not consistent with helioseismological determinations of the sound…
A statistical study of wave propagation in coronal holes
Doyle, J. G.; Banerjee, D.; O'Shea, E.
Aims:To find evidence for propagating magnetoacoustic waves in equatorial and polar coronal hole locations.
Methods: Using temporal series data from the Coronal Diagnostic Spectrometer (CDS) on SOHO, we study oscillations found in radiant flux and velocity measurements from transition region (O V 629) and coronal lines (Mg X 624, Si XII 520). …
On the X-ray and optical properties of the Be star HD 110432 : a very hard-thermal X-ray emitter
Motch, C.; Smith, M. A.; Torrejón, J. M. +2 more
IGR J00234+6141: a new INTEGRAL source identified as an intermediate polar
de Martino, D.; Masetti, N.; Bonnet-Bidaud, J. M. +2 more
Context: Following an extensive survey of the galactic plane by the INTEGRAL satellite, new hard X-ray sources are discovered with a significant fraction of Cataclysmic Variables (CVs) among them.
Aims: We report here the identification of one of these hard X-ray sources, IGR J00234+6141, as an accreting magnetic white dwarf of intermediate po…
New pre-main sequence candidates in the Taurus-Auriga star forming region
Audard, M.; Güdel, M.; Grosso, N. +7 more
Aims:We have studied the X-ray source population of the Taurus Molecular Cloud (TMC) to search for new members of the Taurus-Auriga star forming region.
Methods: Candidate members have been selected among the X-ray sources detected in 24 fields of the XMM-Newton Extended Survey of the Taurus Molecular Cloud, having an IR counterpart in the 2MA…
XMM-Newton observations of PSR B1957+20
Becker, W.; Huang, H. H.
We report on XMM-Newton observations of the "Black Widow pulsar", PSR B1957+20. The pulsar's X-ray emission is non-thermal and best modeled with a single powerlaw spectrum of photon index 2.03+0.51-0.36. No coherent X-ray pulsations at the pulsar's spin-period could be detected, though a strong binary-phase dependence of the …
Mass distribution in the most X-ray-luminous galaxy cluster RX J1347.5-1145 studied with XMM-Newton
Schindler, S.; Gitti, M.; Piffaretti, R.
Context: We report on the analysis of XMM-Newton observations of RX J1347.5-1145 (z=0.451), the most X-ray-luminous galaxy cluster.
Aims: We present a detailed total and gas mass determination up to large distances (~1.7 Mpc), study the scaling properties of the cluster, and explore the role of AGN heating in the cluster cool core.
Methods…
GRB 070311: a direct link between the prompt emission and the afterglow
Troja, E.; Covino, S.; D'Avanzo, P. +30 more
Context: The prompt emission of gamma-ray bursts is mostly thought to be produced in internal shocks of relativistic shells emitted by the progenitor at different times, whereas the late multi-band afterglow is interpreted as the synchrotron emission of electrons swept up by the fireball expanding through the surrounding interstellar medium. The s…