Search Publications
CoRoT's view of newly discovered B-star pulsators: results for 358 candidate B pulsators from the initial run's exoplanet field data
Auvergne, M.; Deleuil, M.; Jorda, L. +18 more
Context: We search for new variable B-type pulsators in the CoRoT data assembled primarily for planet detection, as part of CoRoT's additional programme.
Aims: We aim to explore the properties of newly discovered B-type pulsators from the uninterrupted CoRoT space-based photometry and to compare them with known members of the β Cep and slowly …
The interstellar Ca II distance scale
Krełowski, J.; Galazutdinov, G. A.; Strobel, A. +1 more
Aims: We attempt to extend the relation between the strengths of the interstellar Ca II lines and the distances to early-type stars to objects beyond 1 kiloparsec, with the line saturation taken into account.
Methods: We measure the Ca II K and Ca II H equivalent widths, and compute Ca II column densities for 262 lines of sight towards early-t…
The onset of solar cycle 24. What global acoustic modes are telling us
Jiménez-Reyes, S. J.; García, R. A.; Pallé, P. L. +1 more
We study the response of the low-degree, solar p-mode frequencies to the unusually extended minimum of solar surface activity since 2007. A total of 4768 days of observations collected by the space-based, Sun-as-a-star helioseismic GOLF instrument are analyzed. A multi-step iterative maximum-likelihood fitting method is applied to subseries of 365…
Evolution of red-sequence cluster galaxies from redshift 0.8 to 0.4: ages, metallicities, and morphologies
Moustakas, J.; Pelló, R.; White, S. D. M. +14 more
We present a comprehensive analysis of the stellar population properties and morphologies of red-sequence galaxies in 24 clusters and groups from z∼0.75 to z∼0.45. The dataset, consisting of 215 spectra drawn from the ESO Distant Cluster Survey, constitutes the largest spectroscopic sample at these redshifts for which such an analysis has been con…
The CoRoT target HD 175726: an active star with weak solar-like oscillations
Auvergne, M.; Baudin, F.; García, R. A. +17 more
Context: The CoRoT short runs give us the opportunity to observe a large variety of late-type stars through their solar-like oscillations. We report observations of the star HD 175726 that lasted for 27 days during the first short run of the mission. The time series reveals a high-activity signal and the power spectrum presents an excess due to so…
A search for diffuse radio emission in the relaxed, cool-core galaxy clusters A1068, A1413, A1650, A1835, A2029, and Ophiuchus
Markevitch, M.; Govoni, F.; Carretti, E. +4 more
Aims: We analyze sensitive, high-dynamic-range, observations to search for extended, diffuse, radio emission in relaxed and cool-core galaxy clusters.
Methods: We performed deep 1.4 GHz Very Large Array observations, of A1068, A1413, A1650, A1835, A2029, and complemented our dataset with archival observations of Ophiuchus.
Results: We find…
On the continuum intensity distribution of the solar photosphere
Rouppe van der Voort, L.; Wedemeyer-Böhm, S.
Context: For many years, there seemed to be significant differences between the continuum intensity distributions derived from observations and simulations of the solar photosphere.
Aims: In order to settle the discussion on these apparent discrepancies, we present a detailed comparison between simulations and seeing-free observations that tak…
Generation of highly energetic electrons at reconnection outflow shocks during solar flares
Mann, G.; Aurass, H.; Warmuth, A.
Context: During solar flares a large amount of energy is suddenly released and partly transferred into energetic electrons. They are of special interest since a substantial part of the energy released during a flare is deposited into the energetic electrons. RHESSI observations, e.g. of the 2003 October 28 solar event, show that 1036 el…
Automated supervised classification of variable stars in the CoRoT programme. Method and application to the first four exoplanet fields
Auvergne, M.; Deleuil, M.; Jorda, L. +27 more
Context:
Aims: In this work, we describe the pipeline for the fast supervised classification of light curves observed by the CoRoT exoplanet CCDs. We present the classification results obtained for the first four measured fields, which represent a one-year in-orbit operation.
Methods: The basis of the adopted supervised classification meth…
Evidence of photospheric vortex flows at supergranular junctions observed by FG/SOT (Hinode)
Innes, D. E.; Potts, H. E.; Attie, R.
Context: Twisting motions of different sorts are observed in several layers of the solar atmosphere. Chromospheric sunspot whorls and rotation of sunspots or even higher up in the lower corona sigmoids are examples of the large-scale twisted topology of many solar features. Nevertheless, their occurrence on a large scale in the quiet photosphere h…