Search Publications
Stellar cusp and warm dust at the heart of NGC 1068
Rouan, D.; Gratadour, D.; Grosset, L.
Aims: Establishing precisely how stars and interstellar medium distribute within the central 100 pc area around an AGN, down to the pc scale, is key to understanding the late stages of transfer of matter onto the accretion disc.
Methods: Using adaptive optics-assisted (SPHERE-VLT) near-IR images in the H band, Ks band, and sev…
A particular carbon-chain-producing region: L1489 starless core
Kim, Kee-Tae; Liu, Tie; Yuan, Jinghua +14 more
We detected carbon-chain molecules (CCMs) HC2n+1N (n = 1-3) and C3S in Ku band as well as high-energy excitation lines including C4H N = 9-8, J = 17/2-15/2, 19/2-17/2, and CH3CCH J = 5-4, K = 2 in the 3 mm band toward a starless core called the eastern molecular core (EMC) of L1489 IRS. Maps o…
BRITE photometry of the massive post-RLOF system HD149 404
Gosset, E.; Handler, G.; Wade, G. A. +12 more
Context. HD 149 404 is an evolved non-eclipsing O-star binary that has previously undergone a Roche lobe overflow interaction.
Aims: Understanding some key properties of the system requires a determination of the orbital inclination and of the dimensions of the components.
Methods: The BRITE-Heweliusz satellite was used to collect photom…
Leaves on trees: identifying halo stars with extreme gradient boosted trees
Helmi, Amina; Veljanoski, Jovan; Breddels, Maarten +1 more
Context. Extended stellar haloes are a natural by-product of the hierarchical formation of massive galaxies like the Milky Way. If merging is a non-negligible factor in the growth of our Galaxy, evidence of such events should be encoded in its stellar halo. The reliable identification of genuine halo stars is a challenging task, however.
Aims…
Young open cluster IC 4996 and its vicinity: multicolor photometry and Gaia DR2 astrometry
Munari, U.; Straižys, V.; Raudeliūnas, S. +9 more
The open cluster IC 4996 in Cygnus and its vicinity are investigated by applying a two-dimensional photometric classification of stars measured in the Vilnius seven-color photometric system. Cluster members are identified by applying distances based on the Gaia DR2 parallaxes and the point vector diagram of the Gaia DR2 proper motions. For some B-…
ODEA: Orbital Dynamics in a complex Evolving Architecture. Application to the planetary system HD 106906
De Rosa, R. J.; Lagrange, A. -M.; Beust, H. +3 more
Context. Mixed-variable symplectic integrators are widely used in orbital dynamics. However, they have been developed for Solar system-type architectures, and can not handle evolving hierarchy, in particular in systems with two or more stellar components. Such configuration may have occurred in the history of HD 106906, a tight pair of F-type star…
Updated orbital ephemeris of the ADC source X 1822-371: a stable orbital expansion over 40 years
Sanna, A.; Tailo, M.; Di Salvo, T. +6 more
Aims: Source
Compact gaseous accretion disk in Keplerian rotation around MWC 147
Monnier, John D.; Kraus, Stefan; Weigelt, Gerd +10 more
Context. The disks around some Herbig Be stars have been observed to be more compact than the expected dust sublimation radius for such objects. Highly refractory dust grains and optically thick gas emission have been proposed as possible explanations for this phenomenon.
Aims: Previously, the "undersized" Herbig Be star MWC 147 was observed …
Polarisation of a small-scale cometary plasma environment. Particle-in-cell modelling of comet 67P/Churyumov-Gerasimenko
Nilsson, Hans; Goetz, Charlotte; Gunell, Herbert +2 more
Context. The plasma near the nucleus of a comet is subjected to an electric field to which a few different sources contribute: the convective electric field of the solar wind, the ambipolar electric field due to higher electron than ion speeds, and a polarisation field arising from the vastly different ion and electron trajectories.
Aims: Our…
Properties of the transient X-ray pulsar Swift J1816.7-1613 and its optical companion
Tsygankov, Sergey S.; Lutovinov, Alexander A.; Poutanen, Juri +4 more
We present results of investigation of the poorly studied X-ray pulsar