Search Publications
Solar wind dynamics around a comet. The paradigmatic inverse-square-law model
Behar, E.; Tabone, B.; Saillenfest, M.
Aims: Observations of solar protons near comet 67P/Churyumov-Gerasimenko (67P) by the Rosetta spacecraft can be modelled by the planar motion in an effective magnetic field proportional to 1/r2. We aim to provide a thorough study of such dynamics, with a clear description of the behaviour of an incoming flux of particles. We will b…
The XXL Survey: XXXIII. Chandra Constraints on the AGN Contamination of z > 1 XXL Galaxy Clusters
Chiappetti, L.; Pierre, M.; Willis, J. +11 more
Context. The XMM-XXL survey has used observations from the XMM-Newton observatory to detect clusters of galaxies over a wide range in mass and redshift. The moderate PSF (FWHM 6″ on-axis) of XMM-Newton means that point sources within or projected onto a cluster may not be separated from the cluster emission, leading to enhanced luminosities and af…
WASP 0639-32: a new F-type subgiant/K-type main-sequence detached eclipsing binary from the WASP project
Serenelli, A. M.; Maxted, P. F. L.; Anderson, D. R. +3 more
Aims: Our aim is to measure the masses and radii of the stars in a newly-discovered detached eclipsing binary system to a high precision (≈1%), enabling the system to be used for the calibration of free parameters in stellar evolutionary models.
Methods: Photometry from the Wide Angle Search for Planets (WASP) project was used to identif…
Spectroscopic classification and Gaia DR2 parallaxes of new nearby white dwarfs among selected blue proper motion stars
Jahreiß, H.; Schwope, A.; Pelisoli, I. +2 more
Aims: With our low-resolution spectroscopic observing programme for selected blue proper motion stars, we tried to find new white dwarfs (WDs) in the solar neighbourhood.
Methods: We used the Lépine & Shara Proper Motion (LSPM) catalogue with a lower proper motion limit of 150 mas yr-1 and the Second US Naval Observatory C…
Radio and infrared study of southern H II regions G346.056-0.021 and G346.077-0.056
Vig, S.; Ghosh, S. K.; Liu, T. +3 more
Aim. We present a multiwavelength study of two southern Galactic H II regions G346.056-0.021 and G346.077-0.056 which are located at a distance of 10.9 kpc. The distribution of ionized gas, cold and warm dust, and the stellar population associated with the two H II regions are studied in detail using measurements at near-infrared, mid-infrared, fa…
Mass and energy supply of a cool coronal loop near its apex
He, Jiansen; Peter, Hardi; Wang, Linghua +2 more
Context. Different models for the heating of solar corona assume or predict different locations of the energy input: concentrated at the footpoints, at the apex, or uniformly distributed. The brightening of a loop could be due to the increase in electron density ne, the temperature T, or a mixture of both. Aim. We investigate possible r…
Local disc model in view of Gaia DR1 and RAVE data
Steinmetz, M.; Kordopatis, G.; Grebel, E. K. +8 more
Aims: We test the performance of the semi-analytic self-consistent Just-Jahreiß disc model (JJ model) with the astrometric data from the Tycho-Gaia Astrometric Solution (TGAS) sub-catalogue of the first Gaia data release (Gaia DR1), as well as the radial velocities from the fifth data release of the Radial Velocity Experiment survey (RAVE DR5…
A mass-velocity anisotropy relation in galactic stellar disks
Chemin, Laurent
The ellipsoid of stellar random motions is a fundamental ingredient of galaxy dynamics. Yet it has long been difficult to constrain this component in disks others than the Milky Way. This article presents the modeling of the azimuthal-to-radial axis ratio of the velocity ellipsoid of galactic disks from stellar dispersion maps using integral field…
High-latitude dust clouds LDN 183 and LDN 169: distances and extinctions
Munari, U.; Andersson, B. -G.; Corbally, C. J. +9 more
Interstellar extinction is investigated in a 2°× 2° area containing the dust and molecular clouds LDN 183 (MBM 37) and LDN 169, which are located at RA = 15h 54m, Dec = - 3°. The study is based on a photometric classification in spectral and luminosity classes of 782 stars selected from the catalogs of 1299 stars down to V = …
Mutual event observations of solar system objects by SRC on Mars Express. Analysis and release of observations
Willner, K.; Ziese, R.
Context. Both Martian moons, Phobos and Deimos, have been observed during several imaging campaigns by the Super Resolution Channel (SRC) on the Mars Express probe. Several tens of images are obtained during mutual event observations - when the Martian moons are both observed or together with another solar system body. These observations provide n…