Search Publications
Observations of GRO J1744-28 in quiescence with XMM-Newton
Tsygankov, S.; Santangelo, A.; Doroshenko, V. +3 more
We report on the deep observations of the "bursting pulsar" GRO J1744-28, which were performed with XMM-Newton and aimed to clarify the origin of its X-ray emission in quiescence. We detect the source at a luminosity level of ∼1034 erg s-1 with an X-ray spectrum that is consistent with the power law, blackbody, or accretion-h…
An accurate strong lensing model of the Abell 2163 core
Grillo, C.; Rosati, P.; Lombardi, M. +6 more
Abell 2163 at z ≃ 0.201 is one of the most massive galaxy clusters known, very likely in a post-merging phase. Data from several observational windows suggest a complex mass structure with interacting subsystems, which makes the reconstruction of a realistic merging scenario very difficult. A missing key element in this sense is unveiling the clus…
Benchmarking the fundamental parameters of Ap stars with optical long-baseline interferometric measurements
Shulyak, D.; Ryabchikova, T.; Meilland, A. +10 more
Context. The variety of physical processes at play in chemically peculiar stars makes it difficult to determine their fundamental parameters. In particular, for the magnetic ones, called Ap stars, the strong magnetic fields and the induced spotted stellar surfaces may lead to biased effective temperatures when these values are derived through spec…
Detailed abundances in a sample of very metal-poor stars
Bonifacio, P.; Caffau, E.; Spite, M. +6 more
Context. Unevolved metal-poor stars bore witness to the early evolution of the Galaxy, and the determination of their detailed chemical composition is an important tool to understand its chemical history. The study of their chemical composition can also be used to constrain the nucleosynthesis of the first generation of supernovae that enriched th…
Kinematics of coronal mass ejections in the LASCO field of view
Yashiro, Seiji; Ravishankar, Anitha; Michałek, Grzegorz
In this paper we present a statistical study of the kinematics of 28894 coronal mass ejections (CMEs) recorded by the Large Angle and Spectrometric Coronagraph (LASCO) on board the Solar and Heliospheric Observatory spacecraft from 1996 until mid-2017. The initial acceleration phase is characterized by a rapid increase in CME velocity just after e…
High-precision calculation of the light curve and its interpretation
Abubekerov, M. K.; Gostev, N. Yu.
We present a highly precise calculation of the theoretical light curve and its derivatives for a binary star-planet system in an elliptical orbit. We also describe an analytical fitting by limb-darkening coefficients to reduce the number of parameters for nonlinear fitting. We demonstrate the practical importance of the precision computation of th…
Ground-based visible spectroscopy of asteroids to support the development of an unsupervised Gaia asteroid taxonomy
Tanga, P.; Galluccio, L.; Cellino, A. +4 more
Context. The Gaia mission of the European Space Agency is measuring reflectance spectra of a number to the order of 105 small Solar System objects. A first sample will be published in the Gaia Data Release scheduled for 2021.
Aims: The aim of our work was to test the procedure developed to obtain taxonomic classifications for aster…
Pulsational properties of ten new slowly pulsating B stars
Paunzen, E.; Fedurco, M.; Bernhard, K. +2 more
Context. Slowly pulsating B (SPB) stars are upper main-sequence multi-periodic pulsators that show non-radial g-mode oscillations driven by the κ mechanism acting on the iron bump. These multi-periodic pulsators have great asteroseismic potential and can be employed for the calibration of stellar structure and evolution models of massive stars.
Feedback of molecular outflows from protostars in NGC 1333 revealed by Herschel and Spitzer spectro-imaging observations
Güdel, Manuel; Persson, Magnus; Tafalla, Mario +2 more
Context. Far infrared cooling of excited gas around protostars has been predominantly studied in the context of pointed observations. Large-scale spectral maps of star forming regions enable the simultaneous, comparative study of the gas excitation around an ensemble of sources at a common frame of reference, therefore, providing direct insights i…
Component properties and mutual orbit of binary main-belt comet 288P/(300163) 2006 VW139
Agarwal, J.; Weaver, H.; Larson, S. +3 more
Context. The binary asteroid 288P/(300163) is unusual both for its combination of wide-separation and high mass ratio and for its comet-like activity. It is not currently known whether there is a causal connection between the activity and the unusual orbit or if instead the activity helped to overcome a strong detection bias against such sub-arcse…