Search Publications
Modeling the physical properties in the ISM of the low-metallicity galaxy NGC 4214
Madden, S. C.; Cormier, D.; Bigiel, F. +1 more
We present a model for the interstellar medium of NGC 4214 with the objective to probe the physical conditions in the two main star-forming regions and their connection with the star formation activity of the galaxy. We used the spectral synthesis code Cloudy to model an H ii region and the associated photodissociation region (PDR) to reproduce th…
Herschel imaging of the dust in the Helix nebula (NGC 7293)
Ivison, R. J.; Olofsson, G.; Gomez, H. L. +19 more
Aims: In our series of papers presenting the Herschel imaging of evolved planetary nebulae, we present images of the dust distribution in the Helix nebula (NGC 7293).
Methods: Images at 70, 160, 250, 350, and 500 µm were obtained with the PACS and SPIRE instruments on board the Herschel satellite.
Results: The broadband maps s…
Characterization of the known T-type dwarfs towards the σ Orionis cluster
Béjar, V. J. S.; Zapatero Osorio, M. R.; Peña Ramírez, K.
Aims: The detailed study of T-type candidate members of the young σ Orionis cluster (~3 Myr, ~352 pc, solar metallicity) is fundamental to properly assess the objects' cluster membership and their contribution to the definition of the substellar mass function.
Methods: A total of three T-type candidates (S Ori 70, S Ori 73, and S Ori J05…
The variability behaviour of CoRoT M-giant stars⋆
Baglin, A.; Paz-Chinchón, F.; Janot-Pacheco, E. +8 more
Context. For six years the Convection, Rotation, and planetary Transits (CoRoT) space mission has been acquiring photometric data from more than 100 000 point sources towards and directly opposite the inner and outer regions of the Galaxy. The high temporal resolution of the CoRoT data, combined with the wide time span of the observations, enabled…
Direct observation of the energy release site in a solar flare by SDO/AIA, Hinode/EIS, and RHESSI
Fletcher, L.; Simões, P. J. A.; Graham, D. R.
Aims: We present direct evidence of the detection of the main energy release site in a non-eruptive solar flare, SOL2013-11-09T06:38 UT. This GOES class C2.6 event was characterised by two flaring ribbons and a compact, bright coronal source located between them, which is the focus of our study.
Methods: We use imaging from SDO/AIA, and …
XMM-Newton and optical observations of the eclipsing polar CSS081231:071126+440405
Schwope, A. D.; Worpel, H.
Aims: We aim to study the temporal and spectral behaviour of the eclipsing polar CSS081231:071126+440405 from the infrared to the X-ray regimes.
Methods: We obtained phase-resolved XMM-Newton X-ray observations on two occasions in 2012 and 2013 in different states of accretion. In 2013 the XMM-Newton X-ray and UV data were complemented b…
Study of extremely reddened AGB stars in the Galactic bulge
Engels, D.; Jiménez-Esteban, F. M.
Context. Extremely reddened asymptotic giant branch stars (AGB) lose mass at high rates of >10-5 M⊙ yr-1. This is the very last stage of AGB evolution, in which stars in the mass range ~2.0-4.0 M⊙ (for solar metallicity) should have been converted to C stars already. The extremely reddened AGB stars i…
Search for satellites near comet 67P/Churyumov-Gerasimenko using Rosetta/OSIRIS images
Jorda, L.; Lara, L. M.; Bertaux, J. -L. +44 more
Context. TheEuropean Space Agency Rosetta mission reached and started escorting its main target, the Jupiter-family comet 67P/Churyumov-Gerasimenko, at the beginning of August 2014. Within the context of solar system small bodies, satellite searches from approaching spacecraft were extensively used in the past to study the nature of the visited bo…
The astrometric Gaia-FUN-SSO observation campaign of 99942 Apophis
Sakamoto, T.; Colas, F.; Bikmaev, I. +71 more
Aims: Astrometric observations performed by the Gaia Follow-Up Network for Solar System Objects (Gaia-FUN-SSO) play a key role in ensuring that moving objects first detected by ESA's Gaia mission remain recoverable after their discovery. An observation campaign on the potentially hazardous asteroid (99 942) Apophis was conducted during the as…
Permittivity measurements of porous matter in support of investigations of the surface and interior of 67P/Churyumov-Gerasimenko
Thomas, N.; Brouet, Y.; Encrenaz, P. +4 more
Aims: Permittivity measurements on porous samples of volcanic origin have been performed in the 0.05-190 GHz range under laboratory conditions in support of the Rosetta mission to comet 67P/Churyumov-Gerasimenko, specifically with the MIRO radiometric experiment and CONSERT radar experiment.
Methods: The samples were split into several s…