Search Publications
Seasonal variations in source regions of the dust jets on comet 67P/Churyumov-Gerasimenko
Jorda, L.; Lara, L. M.; Bertaux, J. -L. +43 more
Aims: We investigate the surface distribution of the source regions of dust jets on comet 67P/Churyumov-Gerasimenko as a function of time.
Methods: The dust jet source regions were traced by the comprehensive imaging data set provided by the OSIRIS scientific camera.
Results: We show in detail how the projected footpoints of the dus…
The young stellar population in NGC 247. Main properties and hierarchical clustering
Baume, G.; Rodríguez, M. J.; Feinstein, C.
Aims: We seek to investigate the characteristics of the young stellar population in the spiral galaxy NGC 247. In particular, we focused our attention in its hierarchical clustering distributions and the properties of the smallest groups.
Methods: We used multiband Hubble Space Telescope (HST) data from three fields covering more than ha…
Magnetic activity of the young solar analog V1358 Orinis
Granzer, T.; Carroll, T. A.; Kriskovics, L. +3 more
Context. Young, fast-rotating single stars can show dramatically different magnetic signatures and levels of magnetic activity as compared with the Sun. While losing angular momentum due to magnetic breaking and mass loss through stellar winds, the stars gradually spin down resulting in decreasing levels of activity. Studying magnetic activity on …
Stellar masses from granulation and oscillations of 23 bright red giants observed by BRITE-Constellation
Handler, G.; Wade, G. A.; Hekker, S. +11 more
Context. The study of stellar structure and evolution depends crucially on accurate stellar parameters. The photometry from space telescopes has provided superb data that enabled the asteroseismic characterisation of thousands of stars. However, typical targets of space telescopes are rather faint and complementary measurements are difficult to ob…
Runaways and shells around the CMa OB1 association
Montmerle, T.; Gregorio-Hetem, J.; Santos-Silva, T. +1 more
Context. The origin of the arc-shaped Sh 2-296 nebula is still unclear. Mainly due to its morphology, the nebula has been suggested to be a 0.5 Myr old supernova remnant (SNR) that could be inducing star formation in the CMa OB1 association. This means that the region might be an excellent laboratory for investigating the influence of massive star…
Multi-waveband detection of quasi-periodic pulsations in a stellar flare on EK Draconis observed by XMM-Newton
Broomhall, A. -M.; Rosen, S. R.; Pye, J. P. +2 more
Context. Quasi-periodic pulsations (QPPs) are time variations in the energy emission during a flare that are observed on both the Sun and other stars and thus have the potential to link the physics of solar and stellar flares.
Aims: We characterise the QPPs detected in an X-ray flare on the solar analogue, EK Draconis, which was observed by X…
SHALOS: Statistical Herschel-ATLAS lensed objects selection
Bonavera, L.; González-Nuevo, J.; Herranz, D. +7 more
Context. The statistical analysis of large sample of strong lensing events can be a powerful tool to extract astrophysical or cosmological valuable information. Their selection using submillimetre galaxies has been demonstrated to be very effective with more than ∼200 proposed candidates in the case of Herschel-ATLAS data and several tens in the c…
Vertical position of the Sun with γ-rays
Siegert, Thomas
We illustrate a method for estimating the vertical position of the Sun above the Galactic plane by γ-ray observations. Photons of γ-ray wavelengths are particularly well suited for geometrical and kinematic studies of the Milky Way because they are not subject to extinction by interstellar gas or dust. Here, we use the radioactive decay line of
MUSE-AO view of the starburst-AGN connection: NGC 7130
Knapen, J. H.; Comerón, S.; Seidel, M. K.
We present the discovery of a small kinematically decoupled core of 0.″2 (60 pc) in radius as well as an outflow jet in the archetypical AGN-starburst "composite" galaxy NGC 7130 from integral field data obtained with the adaptive optics-assisted MUSE-NFM instrument on the VLT. Correcting the already good natural seeing at the time of our science …
Solar wind charge exchange in cometary atmospheres. I. Charge-changing and ionization cross sections for He and H particles in H2O
Alho, Markku; Simon Wedlund, Cyril; Nilsson, Hans +7 more
Context. Solar wind charge-changing reactions are of paramount importance to the physico-chemistry of the atmosphere of a comet, mass-loading the solar wind through an effective conversion of fast light solar wind ions into slow heavy cometary ions.
Aims: To understand these processes and place them in the context of a solar wind plasma inter…