Search Publications
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…
Distributed Fast Self-Organized Maps for Massive Spectrophotometric Data Analysis
Manteiga, Minia; Dafonte, Carlos; Garabato, Daniel +1 more
Analyzing huge amounts of data becomes essential in the era of Big Data, where databases are populated with hundreds of Gigabytes that must be processed to extract knowledge. Hence, classical algorithms must be adapted towards distributed computing methodologies that leverage the underlying computational power of these platforms. Here, a parallel,…
Thermophysical modelling for high-resolution digital terrain models
Pelivan, I.
A method is presented for efficiently calculating surface temperatures for highly resolved celestial body shapes. A thorough investigation of the necessary conditions leading to reach model convergence shows that the speed of surface temperature convergence depends on factors such as the quality of initial boundary conditions, thermal inertia, ill…
A statistical study of CME-Preflare associated events
Youssef, M.; Mawad, Ramy
We investigated the relationship of associated CME-Preflare during the solar period 1996-2010. We found 292 CME-Preflare associated events (∼2%). Those associated events have 0-1 h interval time, popular events occur within half an hour before flare starting time. Post-flares-CME associated events are wider than CME-Preflare associated events. CME…
Precursors of short gamma-ray bursts detected by the INTEGRAL observatory
Minaev, Pavel; Pozanenko, Alexei; Molkov, Sergei
We have analyzed the light curves of 527 short gamma-ray bursts (GRBs) registered by the SPI-ACS, SPI and IBIS/ISGRI experiments of INTEGRAL observatory totally to search for precursors. Both the light curves of each 527 individual burst and the averaged light curve of 372 brightest SPI-ACS bursts have been analyzed. In a few cases, we have found …
Discovery of a 3 s Spinning Neutron Star in a 4.15 hr Orbit in the Brightest Hard X-Ray Source in M31
Esposito, Paolo; Tiengo, Andrea; Israel, Gian Luca +5 more
We report the discovery with XMM-Newton of 3 s X-ray pulsations from 3XMM J004232.1+411314, a dipping source that dominates the hard X-ray emission of M31. This finding unambiguously assesses the neutron star (NS) nature of the compact object. We also measured an orbital period of 4.15 hr and a projected semi-axis at aX sin i = 0.6 lt-s…
BEANS - a software package for distributed Big Data analysis
Hypki, Arkadiusz
BEANS software is a web-based, easy to install and maintain, new tool to store and analyse in a distributed way a massive amount of data. It provides a clear interface for querying, filtering, aggregating, and plotting data from an arbitrary number of data sets. Its main purpose is to simplify the process of storing, examining, and finding new rel…
On the inner disc structure of MWC480: evidence for asymmetries?
Matter, A.; Lopez, B.; Sitko, M. L. +7 more
Studying the physical conditions structuring the young circumstellar discs is required for understanding the onset of planet formation. Of particular interest is the protoplanetary disc surrounding the Herbig star MWC480. The structure and properties of the circumstellar disc of MWC480 are studied by infrared interferometry and interpreted from a …
Dynamics of Dust Particles of Different Structure: Application to the Modeling of Dust Motion in the Vicinity of the Nucleus of Comet 67P/Churyumov-Gerasimenko
Hartogh, P.; Rezac, L.; Lacerda, P. +2 more
We consider the estimates of the main forces acting on dust particles near a cometary nucleus. On the basis of these estimates, the motion of dust particles of different structure and mass is analyzed. We consider the following forces: (1) the cometary nucleus gravity, (2) the solar radiation pressure, and (3) the drag on dust particles by a flow …
A search for peculiar stars in the open cluster Hogg 16
Paunzen, Ernst; Netopil, Martin; Cariddi, Stefano +5 more
The study of chemically peculiar (CP) stars in open clusters provides valuable information about their evolutionary status. Their detection can be performed using the Δa photometric system, which maps a characteristic flux depression at λ ∼ 5200 Å. This paper aims at studying the occurrence of CP stars in the earliest stages of evolution of a stel…