Search Publications
Two years with comet 67P/Churyumov-Gerasimenko: H2O, CO2, and CO as seen by the ROSINA/RTOF instrument of Rosetta
Lasue, J.; Wurz, P.; Altwegg, K. +18 more
Context. The ESA Rosetta mission investigated the environment of comet 67P/Churyumov-Gerasimenko (hereafter 67P) from August 2014 to September 2016. One of the experiments on board the spacecraft, the Rosetta Orbiter Spectrometer for Ion and Neutral Analysis (ROSINA) included a COmet Pressure Sensor (COPS) and two mass spectrometers to analyze the…
Elemental composition in quiescent prominences
Vial, J. -C.; Parenti, S.; Del Zanna, G.
Context. The first ionization potential (FIP) bias is currently used to trace the propagation of solar features ejected by the wind and solar eruptions (coronal mass ejections). The FIP bias also helps us to understand the formation of prominences, as it is a tracer for the solar origin of prominence plasma.
Aims: This work aims to provide el…
Spectroscopic binaries RV Tauri and DF Cygni
Bowman, Dominic M.; Manick, Rajeev; Van Winckel, Hans +7 more
Context. Some RV Tauri stars show a long-term photometric variability in their mean magnitudes. DF Cygni (DF Cyg), the only RV Tauri star in the original Kepler field, and the prototype RV Tauri (RV Tau) are two such stars.
Aims: The focus of this paper is on two famous but still poorly understood RV Tauri stars: RV Tau and DF Cyg. We aim to …
The Gaia-ESO Survey: The inner disc, intermediate-age open cluster Pismis 18
Hatzidimitriou, D.; Gilmore, G.; Bayo, A. +34 more
Context. Pismis 18 is a moderately populated, intermediate-age open cluster located within the solar circle at a Galactocentric distance of about seven kpc. Few open clusters have been studied in detail in the inner disc region before the Gaia-ESO Survey.
Aims: New data from the Gaia-ESO Survey allowed us to conduct an extended radial velocit…
MUSE unravels the ionisation and origin of metal-enriched absorbers in the gas halo of a z = 2.92 radio galaxy
Humphrey, A.; Villar-Martín, M.; De Breuck, C. +9 more
We have used the Multi-Unit Spectroscopic Explorer (MUSE) to study the circumgalactic medium (CGM) of a z = 2.92 radio galaxy, MRC 0943-242 by parametrising its emitting and absorbing gas. In both Lyα λ1216 and He II λ1640 lines, we observe emission with velocity shifts of Δv ≃ -1000 km s-1 from the systemic redshift of the galaxy. Thes…
Surface evolution of the Anhur region on comet 67P/Churyumov-Gerasimenko from high-resolution OSIRIS images
Jorda, L.; Lamy, P. L.; Bertaux, J. -L. +34 more
Context. The southern hemisphere of comet 67P/Churyumov-Gerasimenko (67P) became observable by the Rosetta mission in March 2015, a few months before cometary southern vernal equinox. The Anhur region in the southern part of the comet's larger lobe was found to be highly eroded, enriched in volatiles, and highly active.
Aims: We analyze high-…
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…