Search Publications
Combined asteroseismology, spectroscopy, and astrometry of the CoRoT B2V target HD 170580
Poretti, E.; Rainer, M.; Aerts, C. +9 more
Context. Space asteroseismology reveals that stellar structure and evolution models of intermediate- and high-mass stars are in need of improvement in terms of angular momentum and chemical element transport.
Aims: We aim to probe the interior structure of a hot, massive star in the core-hydrogen-burning phase of its evolution.
Methods: …
Link between brightest cluster galaxy properties and large scale extensions of 38 DAFT/FADA and CLASH clusters in the redshift range 0.2 < z < 0.9
Adami, C.; Durret, F.; Márquez, I. +2 more
Context. In the context of large-scale structure formation, clusters of galaxies are located at the nodes of the cosmic web, and continue to accrete galaxies and groups along filaments. In some cases, they show a very large extension and a preferential direction. Brightest cluster galaxies (BCGs) are believed to grow through the accretion of many …
On the Relation between Interstellar Spectral Features and Reddening
Krełowski, J.; Bondar, A.; Galazutdinov, G. +1 more
It is well known that interstellar spectral features correlate with color excess E(B-V). This suggests that measuring intensities of these features allows one to estimate reddening of stars. The aim of this paper is to check how tight intensities of interstellar diffuse bands (DIBs) are related to the amount of extinction, measured using E(B-V). <…
GJ 357: a low-mass planetary system uncovered by precision radial velocities and dynamical simulations
Suárez, Juan C.; Tuomi, M.; Jenkins, J. S. +5 more
We report the detection of a new planetary system orbiting the nearby M2.5V star GJ 357, using precision radial velocities from three separate echelle spectrographs, High Accuracy Radial velocity Planet Searcher (HARPS), High Resolution Echelle Spectrograph (HiRES), and Ultraviolet and Visible Echelle Spectrograph (UVES). Three small planets have …
First results from a large-scale proper motion study of the Galactic centre
Nogueras-Lara, F.; Gallego-Calvente, A. T.; Dong, H. +4 more
Proper motion studies of stars in the centre of the Milky Way have typically been limited to the Arches and Quintuplet clusters, and to the central parsec. Here we present the first results of a large-scale proper motion study of stars within several tens of parsecs of Sagittarius A* based on our 0.2″ angular resolution GALACTICNUCLEUS survey (epo…
The central star of planetary nebula PHR 1315 - 6555 and its host Galactic open cluster AL 1
Lykou, F.; Zijlstra, A.; Parker, Q. A. +2 more
PHR 1315 - 6555 is a rare case of a Galactic planetary nebula that is a proven member of the open cluster AL 1. This membership allows its distance to be defined with precision, and thus accurate measurements of its physical characteristics along with the parameters of its central star (CS) can be obtained. In this work, we use the Hubble Space Te…
Evidence for color dichotomy in the primordial Neptunian Trojan population
Smith, M.; D'Andrea, C. B.; Abbott, T. M. C. +45 more
In the current model of early Solar System evolution, the stable members of the Jovian and Neptunian Trojan populations were captured into resonance from the leftover reservoir of planetesimals during the outward migration of the giant planets. As a result, both Jovian and Neptunian Trojans share a common origin with the primordial disk population…
Physical Properties of the Close-in Tertiary in the Southern Triple-lined System VZ Lib
Qian, S. -B.; Liao, W. -P.; Sarotsakulchai, T.
VZ Lib is a southern triple-lined system. By analyzing all available times of light minima, orbital period changes are revisited in detail. We discovered that the observed-calculated (O - C) curve shows a long-term period decrease at a rate of {dP}/{dt}=-2.25× {10}-7 {days yr}}-1, revealing a mass transfer from the more massi…
Multi-epoch X-ray spectral analysis of the narrow-line Seyfert 1 galaxy Mrk 478
Gallo, L. C.; Zoghbi, A.; Gonzalez, A. G. +2 more
A multi-epoch X-ray spectral and variability analysis is conducted for the narrow-line Seyfert 1 (NLS1) active galactic nucleus (AGN) Mrk 478. All available X-ray data from XMM-Newton and Suzaku satellites, spanning from 2001 to 2017, are modelled with a variety of physical models, including partial covering, soft Comptonization, and blurred refle…
Spectral Diagnosis of Mg II and Hα Lines during the Initial Stage of an M6.5 Solar Flare
Xu, Yan; Jing, Ju; Wang, Haimin +2 more
Recent studies have shown special spectral properties during the initial stage of flare emissions, such as the enhanced absorption in He I 10830 Å line and a strong redshift in Hα. Using the high-resolution imaging spectroscopic data obtained by the Interface Region Imaging Spectrograph (IRIS), we investigate the Mg II emission lines during an M6.…