Search Publications
From CoRoT 102899501 to the Sun. A time evolution model of chromospheric activity on the main sequence
Deleuil, M.; Fridlund, M.; Gondoin, P. +7 more
Aims: The present study reports measurements of the rotation period of a young solar analogue, estimates of its surface coverage by photospheric starspots and of its chromospheric activity level, and derivations of its evolutionary status. Detailed observations of many young solar-type stars, such as the one reported in the present paper, pro…
Empirical near-infrared colors for low-mass stars and brown dwarfs in the Orion Nebula Cluster. An empirical near-infrared isochrone at ~1 Myr
Robberto, M.; Scandariato, G.; Da Rio, N. +2 more
Context. Current atmospheric and evolutionary models for low-mass stars and brown dwarfs rely on approximate assumptions on the physics of the stellar structure and the atmospheric radiative transfer. This leads to biased theoretical predictions on the photospheric spectral energy distributions of these system, especially when applied to low surfa…
Spectral and spatial observations of microwave spikes and zebra structure in the short radio burst of May 29, 2003
Yan, Y.; Meshalkina, N. S.; Tan, C. +2 more
Context. The unusual radio burst of May 29, 2003 connected with the M1.5 flare in AR 10368 has been analyzed. It was observed by the Solar Broadband Radio Spectrometer (SBRS/Huairou station, Beijing) in the 5.2-7.6 GHz range. It proved to be only the third case of a neat zebra structure appearing among all observations at such high frequencies. De…
Hot gas in groups: NGC 5328 and the intriguing case of NGC 4756 with XMM-Newton
Wolter, A.; Marino, A.; Trinchieri, G. +2 more
Context. Environment appears to have a strong influence on the fundamental properties of galaxies, modifying both their morphologies and their star formation histories. Similarly, galaxies play a role in determining the properties of the hot intergalactic medium in groups, heating and enriching it through a variety of mechanisms. NGC 5238 and NGC …
Measuring the orbital inclination of Z Andromedae from Rayleigh scattering
Skopal, A.; Shagatova, N.
Context. The orbital inclination of the symbiotic prototype Z And has not been established yet. At present, two very different values are considered, i ~ 44° and i ≳ 73°. The correct value of i is a key parameter in, for example, modeling the highly-collimated jets of Z And.
Aims: To measure the orbital inclination of Z And.
Methods: Fir…
What is the true nature of blinkers?
Doyle, J. G.; Madjarska, M. S.; Bewsher, D. +1 more
Aims: The aim of this work is to identify the true nature of the transient EUV brightenings, called blinkers.
Methods: Co-spatial and co-temporal multi-instrument data, including imaging (EUVI/STEREO, XRT and SOT/Hinode), spectroscopic (CDS/SoHO and EIS/Hinode) and magnetogram (SOT/Hinode) data, of an isolated equatorial coronal hole wer…
The near-IR counterpart of IGR J17480-2446 in Terzan 5
D'Antona, F.; Ventura, P.; Papitto, A. +8 more
Context. Some globular clusters in our Galaxy are noticeably rich in low-mass X-ray binaries.
Aims: The detection and study of optical/IR counterparts of low-mass X-ray binaries is fundamental to characterizing b…
Upper limits on the high-energy emission from gamma-ray bursts observed by AGILE-GRID
Antonelli, L. A.; Costa, E.; Mereghetti, S. +60 more
Context. The detection and the characterization of the highenergy emission component from individual gamma-ray bursts (GRBs) is one of the key science objectives of the currently operating gamma-ray satellite AGILE, launched in April 2007. In its first two years of operation AGILE detected three GRBs with photons of energy larger than 30 MeV. One …
Horizontal flow fields observed in Hinode G-band images. III. The decay of a satellite sunspot and the role of magnetic flux removal in flaring
Verma, M.; Denker, C.
Context. Emergence of magnetic flux plays an important role in the initiation of flares. However, the role of submerging magnetic flux in prompting flares is more ambiguous, not the least because of the scarcity of observations.
Aims: The flare-prolific active region NOAA 10930 offered both a developing δ-spot and a decaying satellite sunspot…
A Corona Australis cloud filament seen in NIR scattered light. III. Modelling and comparison with Herschel sub-millimetre data
Juvela, M.; White, G. J.; Könyves, V. +3 more
Context. The dust is an important tracer of dense interstellar clouds but its properties are expected to undergo changes affecting the scattering and emitting properties of the grains. With recent Herschel observations, the northern filament of the Corona Australis cloud has now been mapped in a number of bands from 1.2 µm to 870 µm. T…