Search Publications
Kinematics of planet-host stars and their relation to dynamical streams in the solar neighbourhood
Pont, F.; Santos, N. C.; Mayor, M. +2 more
We present a detailed study on the kinematics of metal-rich stars with and without planets, and their relation to the Hyades, Sirius and Hercules dynamical streams in the solar neighbourhood. Accurate kinematics have been derived for all the stars belonging to the CORALIE planet search survey. We used precise radial velocity measurements and CCF p…
The highly obscured region around PKS 1343 - 601 . I. Galactic interstellar extinctions using DENIS galaxy colours
Woudt, P. A.; Schröder, A. C.; Kraan-Korteweg, R. C. +1 more
The highly obscured radio-bright galaxy
The X-ray activity-rotation relation of T Tauri stars in Taurus-Auriga
Audard, M.; Güdel, M.; Grosso, N. +9 more
Context: The Taurus-Auriga star-forming complex hosts the only population of T Tauri stars in which an anticorrelation of X-ray activity and rotation period has been observed.
Aims: We aim to explain the origin of the X-ray activity-rotation relation in Taurus-Auriga. We also aim to put the X-ray activity of these stars into the context of the…
The extended structure of the remote cluster B514 in M 31. Detection of extra-tidal stars
Bellazzini, M.; Galleti, S.; Federici, L. +3 more
Aims:We present a study of the density profile of the remote M 31 globular cluster B514, obtained from HST/ACS observations.
Methods: By coupling analysis of the distribution of the integrated light with star counts, we are able to reliably follow the profile of the cluster out to r ~ 35 arcsec, corresponding to ≃130 pc. The profile is well-fi…
Three-dimensional reconstruction of the streamer belt and other large-scale structures of the solar corona. I. Method
Llebaria, A.; Lamy, P.; Vibert, D. +1 more
Context: The high spatial resolution, white-light images obtained by the LASCO coronagraphs provide a detailed record of the solar corona over almost a full solar cycle. Their analysis and interpretation poses a formidable challenge for ultimately retrieving the 3-dimensional distribution of electrons in the corona.
Aims: Our goal is to implem…
In search of an unbiased temperature estimator for statistically poor X-ray spectra
Molendi, S.; Leccardi, A.
Although commonly employed by X-ray astronomers, maximum likelihood estimators are known to be biased. In this paper we investigate the bias associated with the measure of the temperature from an X-ray thermal spectrum. We show that, in the case of low surface brightness regions, commonly adopted estimators, such as those based on χ2 an…
Intensity variations inside supergranules
Roudier, Th.; Meunier, N.; Tkaczuk, R.
Context: The convective origin of supergranulation is highly controversial. Past measurements of intensity variations inside supergranules have often been influenced by the brightness enhancement at the cell boundaries due to the magnetic network.
Aims: We conduct a precise determination of intensity variations inside supergranules.
Method…
PAHs in the halo of NGC 5529
Madden, S.; Parkin, T.; Irwin, J. A. +1 more
We present sensitive ISO λ 6.7~µm observations of the edge-on galaxy, NGC 5529, finding an extensive MIR halo around NGC 5529. The emission is dominated by PAHs in this band. The PAH halo has an exponential scale height of 3.7 kpc but can still be detected as far as ≈10 kpc from the plane to the limits of the high dynamic range (1770/1) data…
Direct imaging of the young spectroscopic binary HD 160934
Henning, T.; Brandner, W.; Hormuth, F. +2 more
Context: Members of nearby moving groups are promising candidates for the detection of stellar or substellar companions by direct imaging. Mass estimates and magnitude measurements of detected companions to young stars are valuable input data to facilitate the refinement of existing pre-main-sequence stellar models. In this paper we report on our …
The variable X-ray light curve of GRB 050713A: the case of refreshed shocks
Covino, S.; Campana, S.; Tagliaferri, G. +21 more
We present a detailed study of the spectral and temporal properties of the X-ray and optical emission of GRB050713a up to 0.5 day after the main Gamma Ray Burst (GRB) event. The X-ray light curve exhibits large amplitude variations with several rebrightenings superposed on the underlying three-segment broken power-law that is often seen in Swift G…