Search Publications
Statistical techniques for the detection and analysis of solar explosive events
Sarro, L. M.; Berihuete, A.
Context. Solar explosive events are commonly explained as small-scale magnetic reconnection events, although an unambiguous confirmation of this scenario remains elusive owing to the lack of spatial resolution and the statistical analysis of sufficiently large samples of this type of events.
Aims: We propose a sound statistical treatment of d…
V456 Ophiuchi and V490 Cygni: Systems with the shortest apsidal-motion periods
Wolf, M.; Zasche, P.
Our main aim is the first detailed analysis of the two eclipsing binaries V456 Oph and V490 Cyg. The system V456 Oph has been studied both photometrically via an analysis of its light curve observed by the INTEGRAL/OMC and by the period analysis of all available times of minima. V490 Cyg has been studied by means of a period analysis only. Many ne…
The Hubble Legacy Archive ACS grism data
Walsh, J. R.; Rosati, P.; Kümmel, M. +8 more
A public release of slitless spectra, obtained with ACS/WFC and the G800L grism, is presented. Spectra were automatically extracted in a uniform way from 153 archival fields (or "associations") distributed across the two Galactic caps, covering all observations to 2008. The ACS G800L grism provides a wavelength range of 0.55-1.00 µm, with a …
Kernel spectral clustering of time series in the CoRoT exoplanet database
Debosscher, J.; Varón, C.; Alzate, C. +1 more
Context. Detection of contaminated light curves and irregular variables has become a challenge when studying variable stars in large photometric surveys such as that produced by the CoRoT mission.
Aims: Our goal is to characterize and cluster the light curves of the first four runs of CoRoT, in order to find the stars that cannot be classifie…
The properties of asteroid (2867) Steins from Spitzer Space Telescope observations and OSIRIS shape reconstruction
Jorda, L.; Lamy, P.; Fornasier, S. +1 more
Aims: We report on the thermal properties and composition of asteroid (2867) Steins derived from an analysis of new Spitzer Space Telescope (SST) observations performed in March 2008, in addition to previously published SST observations performed in November 2005.
Methods: We consider the three-dimensional shape model and photometric pro…
Center-limb dependence of photospheric velocities in regions of emerging magnetic fields on the Sun
Khlystova, A.
Aims: We investigate the ratio of the vertical and horizontal velocities of the photospheric plasma flows in the region of emerging magnetic fields on the Sun.
Methods: We carried out a study of photospheric velocities during the first hours of the appearance of 83 active regions with magnetic flux more than 1021 Mx with data …
No apparent accretion mode changes detected in Centaurus X-3
Müller, D.; Klochkov, D.; Santangelo, A. +2 more
Aims: Two distinct spectral states have previously been reported for Cen X-3 on the basis of RXTE/ASM observations. Intrigued by this result, we investigated the spectral properties of the source using the enhanced possibilities of the X-ray data now available with the aim to clarify and interpret the reported behavior.
Methods: To check…
A search for X-ray sources around WR 22 in the Carina region
Gosset, E.; Nazé, Y.; Rauw, G. +2 more
We present the results of a deep search for X-ray sources in a circular field of 30' in diameter situated around WR 22 in the Carina region and observed with the XMM-Newton observatory. This field is broadly located to the west of the main part of the Carina nebula. On the basis of six pointings (nominal exposure time: 10 ks each) centred on the W…
Coronal properties of planet-bearing stars (Corrigendum)
Schmitt, J. H. M. M.; Robrade, J.; Poppenhaeger, K.
The jet of the BL Lacertae object PKS 2201+044: MAD near-IR adaptive optics observations and comparison with optical, radio and X-ray data
Moretti, A.; Falomo, R.; Treves, A. +14 more
Context. Relativistic jets are a common feature of radio loud active galactic nuclei. Multifrequency observations are a unique tool to constrain their physics.
Aims: We report on a detailed study of the properties of the jet of the nearby BL Lac object PKS 2201+044, one of the rare cases where the jet is detected from radio to X-rays.
Me…