Search Publications
X-ray study of Abell 3365 with XMM-Newton
Urdampilleta, I.; Simionescu, A.; Kaastra, J. S. +5 more
We present an X-ray spectral analysis using XMM-Newton/EPIC observations (∼100 ks) of the merging galaxy cluster Abell 3365 (z = 0.093). Previous radio observations suggested the presence of a peripheral elongated radio relic to the east and a smaller radio relic candidate to the west of the cluster center. We find evidence of temperature disconti…
Fine structure in the luminosity function in young stellar populations with Gaia DR2
Brown, Anthony G. A.; Kaper, Lex; de Bruijne, Jos H. J. +2 more
Context. A pioneering study showed that the fine structure in the luminosity function (LF) of young star clusters contains information about the evolutionary stage (age) and composition of the stellar population. The notable features include the H-peak, which is the result of the onset of hydrogen burning turning pre-main sequence stars into main …
HADES RV programme with HARPS-N at TNG. XIV. A candidate super-Earth orbiting the M-dwarf GJ 9689 with a period close to half the stellar rotation period
Rebolo, R.; Ribas, I.; Morales, J. C. +27 more
Context. It is now well-established that small, rocky planets are common around low-mass stars. However, the detection of such planets is challenged by the short-term activity of host stars.
Aims: The HARPS-N red Dwarf Exoplanet Survey programme is a long-term project at the Telescopio Nazionale Galileo aimed at monitoring nearby, early-type,…
Strongly lensed candidates from the HSC transient survey
Suyu, Sherry H.; Jaelani, Anton T.; Nagao, Tohru +5 more
We present a lensed quasar search based on the variability of lens systems in the Hyper Suprime-Cam (HSC) transient survey. Starting from 101 353 variable objects with i-band photometry in the HSC transient survey, we used a variability-based lens search method measuring the spatial extent in difference images to select potential lensed quasar can…
Wide companions to M and L subdwarfs with Gaia and the Virtual Observatory
Cortés-Contreras, M.; Solano, E.; Lodieu, N. +3 more
Aims: The aim of the project is to identify wide common proper motion companions to a sample of spectroscopically confirmed M and L metal-poor dwarfs (also known as subdwarfs) to investigate the impact of metallicity on the binary fraction of low-mass metal-poor binaries and to improve the determination of their metallicity from the higher-ma…
A young spectroscopic binary in a quintuple system part of the Local Association
Murgas, Felipe; Jeffers, Sandra V.; McCully, Curtis +9 more
Context. Double-lined spectroscopic (SB2) binaries allow us to obtain a direct determination of the masses of their components, which is essential to test stellar models. Although these objects only provide a lower limit for the mass, they are more abundant than their eclipsing counterparts as they are not as strongly limited by the inclination of…
LBV phenomenon and binarity: The environment of HR Car
Mehner, A.; de Wit, W. -J.; Agliozzo, C. +7 more
Luminous blue variable stars (LBVs) are of great interest in massive-star evolution as they experience very high mass-loss episodes within short periods of time. HR Car is a famous member of this class in the Galaxy. It has a large circumstellar nebula and has also been confirmed as being in a binary system. One means of gaining information about …
Solar Orbiter observations of the structure of reconnection outflow layers in the solar wind
Lewis, G. R.; Fedorov, A.; Livi, S. +22 more
We briefly review an existing model of the structure of reconnection layers which predicts that several more distinct layers, in the form of contact discontinuities, rotational Alfvèn waves, or slow shocks, should be identifiable in solar wind reconnection events than are typically reported in studies of reconnection outflows associated with bifur…
Purveyors of fine halos. III. Chemical abundance analysis of a potential ωCen associate
Hanke, Michael; Hansen, Camilla Juul; Bonifacio, Piercarlo +3 more
Globular clusters (GCs) are important donors to the build-up of the Milky Way (MW) stellar halo, having contributed at the ten percent level over the Galactic history. Stars that originated from the second generation of dissolved or dissolving clusters can be readily identified via distinct light-element signatures such as enhanced N and Na and si…
Gaseous nebulae and massive stars in the giant H I ring in Leo
Venturi, Giacomo; Cresci, Giovanni; Thilker, David +2 more
Context. Chemical abundances in the Leo ring, the largest H I cloud in the local Universe, have recently been determined to be close to or above Solar values. This is a finding that is incompatible with prior claims that the ring was primordial in origin. The gas, pre-enriched in a galactic disk and tidally stripped, did not manage to efficiently …