Search Publications
The γ Doradus CoRoT target HD 49434. II. Frequency analysis of the CoRoT data
Auvergne, M.; Amado, P. J.; Baudin, F. +18 more
Context. HD 49434 is a bright (V = 5.75 m) and multiperiodic γ Dor-type pulsator that has been selected for the asteroseismic core programme of the CoRoT satellite.
Aims: An extensive and detailed study has been carried out to investigate the pulsational content of this object on the basis of the 136.9 d (331291 useful datapoints) time series…
A new study of the supernova remnant G344.7-0.1 located in the vicinity of the unidentified TeV source HESS J1702-420
Giacani, E.; Smith, M. J. S.; Dubner, G. +1 more
Context. The identification of counterparts of dark gamma-ray sources adds greatly to our understanding of their underlying astrophysical processes.
Aims: We investigate the physical properties of the supernova remnant (SNR) G344.7-0.1, to clarify whether it hosts a pulsar wind nebula (PWN), and the possible physical relationship between the …
VLBI imaging of a flare in the Crab nebula: more than just a spot
Muxlow, T. W. B.; Horns, D.; Lobanov, A. P.
We report on very long baseline interferometry (VLBI) observations of the radio emission from the inner region of the Crab nebula, made at 1.6 GHz and 5 GHz after a recent high-energy flare in this object. The 5 GHz data have provided only upper limits of 0.4 milli-Jansky (mJy) on the flux density of the pulsar and 0.4 mJy/beam on the brightness o…
X Herculis and TX Piscium: two cases of ISM interaction with stellar winds observed by Herschel
Blommaert, J. A. D. L.; Olofsson, H.; Jorissen, A. +14 more
The asymptotic giant branch (AGB) stars X Her and TX Psc have been imaged at 70 and 160 µm with the PACS instrument onboard the Herschel satellite, as part of the large MESS (Mass loss of Evolved StarS) guaranteed time key program. The images reveal an axisymmetric extended structure with its axis oriented along the space motion of the stars…
IKT 16: a composite supernova remnant in the Small Magellanic Cloud
Pietsch, W.; Haberl, F.; Hatzidimitriou, D. +11 more
Aims: IKT 16 is an X-ray and radio-faint supernova remnant (SNR) in the Small Magellanic Cloud (SMC). A previous X-ray study of this SNR found a hard X-ray source near its centre. Using all available archival and proprietary XMM-Newton data, alongside new multi-frequency radio-continuum surveys and optical observations at Hα and forbidden [SI…
Benchmarking atomic data for astrophysics: Fe xiii EUV lines
Del Zanna, G.
Recent atomic data for Fe xiii are benchmarked against high-resolution spectroscopic observations of the solar corona. All the identifications of the EUV lines are reviewed by also taking into account laboratory measurements. A few new identifications are proposed, and many wavelengths are revised. All the strongest EUV lines are now identified. V…
The brightness of magnetic field concentrations in the quiet Sun
Schnerr, R. S.; Spruit, H. C.
In addition to the "facular" brightening of active regions, the quiet Sun also contains a small scale magnetic field with associated brightenings in continuum radiation. We measure this contribution of quiet regions to the Sun's brightness from high spatial resolution (0.16 arcsec-0.32 arcsec) observations of the Swedish 1-m Solar Telescope (SST) …
High ions towards white dwarfs: circumstellar line shifts and stellar temperature
Barstow, M. A.; Lallement, R.; Welsh, B. Y. +1 more
Aims: Our aim is to gain new insights into highly ionized gas towards nearby hot white dwarfs (WDs). The detection of absorption lines of highly ionized interstellar (IS) species in their spectra is the main diagnostic tool of the hot IS gas phase. This requires disentangling IS ions from photospheric or circumstellar (CS) ions, and thus thei…
Transiting exoplanets from the CoRoT space mission. XVII. The hot Jupiter CoRoT-17b: a very old planet
Mazeh, T.; Aigrain, S.; Alonso, R. +49 more
We report on the discovery of a hot Jupiter-type exoplanet, CoRoT-17b, detected by the CoRoT satellite. It has a mass of 2.43 ± 0.30 MJup and a radius of 1.02 ± 0.07 RJup, while its mean density is 2.82 ± 0.38 g/cm3. CoRoT-17b is in a circular orbit with a period of 3.7681 ± 0.0003 days. The host star is an old (10…
Dark matter halos around isolated ellipticals
Babić, A.; Memola, E.; Salucci, P.
Aims: We investigate the distribution of the luminous and the dark matter components in the isolated ellipticals NGC 7052 and NGC 7785, which are embedded in an emitting hot gas halo, by means of relevant X-ray and photometric data.
Methods: To calculate the dark matter distribution in these rare objects, we performed an improved X-ray a…