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Properties of IR-selected active galactic nuclei
García Lambas, D.; Alonso, M. V.; Bornancini, C. G. +1 more
Context. Active galactic nuclei (AGNs) of galaxies play an important role in the life and evolution of galaxies through the impact they exert on certain properties and on the evolutionary path of galaxies. It is well known that infrared (IR) emission is useful for selecting galaxies with AGNs, although it has been observed that there is contaminat…
The Cluster Ages Experiment (CASE) - IX. Analysis of four detached eclipsing binaries in the globular cluster NGC 3201
Marshall, J. L.; Thompson, I. B.; Morrell, N. +14 more
We use photometric and spectroscopic observations of four detached eclipsing binaries in the globular cluster NGC 3201 to derive masses, radii, and luminosities of the component stars. Spanning across almost three magnitudes in the colour-magnitude diagram, the components offer a unique possibility to test the theory of stellar evolution. Their ma…
Detached eclipsing binaries from the Kepler field: radii and photometric masses of components in short-period systems
Diaz, Marcos P.; Cruz, Patricia; Aguilar, John F. +2 more
The characterization of detached eclipsing binaries with low-mass components has become important when verifying the role of convection in stellar evolutionary models, which requires model-independent measurements of stellar parameters with great precision. However, spectroscopic characterization depends on single-target radial velocity observatio…
VLA Observations of the AE Aqr-type Cataclysmic Variable LAMOST J024048.51+195226.9
Barrett, Paul E.
AE Aqr was until recently the only known magnetic cataclysmic variable (MCV) containing a rapidly spinning (33.08 s) white dwarf (WD). Its radio emission is believed to be a superposition of synchrotron-emitting plasmoids, because it has a positive spectral index spanning three orders of magnitude (≈2-2000 GHz) and is unpolarized. Both characteris…
On the synergy between Ariel and ground-based high-resolution spectroscopy
Sozzetti, Alessandro; Bonomo, Aldo S.; Guilluy, Gloria +2 more
Since the first discovery of an extra-solar planet around a main-sequence star, in 1995, the number of detected exoplanets has increased enormously. Over the past two decades, observational instruments (both onboard and on ground-based facilities) have revealed an astonishing diversity in planetary physical features (i. e. mass and radius), and or…
Water ortho-to-para ratio in the coma of comet 67P/Churyumov-Gerasimenko
Encrenaz, T.; Erard, S.; Crovisier, J. +9 more
Context. Abundance ratios of the nuclear-spin isomers of H2O and NH3 have been measured in about two dozen comets, with a mean value corresponding to a nuclear-spin temperature of ~30 K. The real meaning of these unequilibrated nuclear-spin abundance ratios is still debated. However, an equilibrated water ortho-to-para ratio …
The Distribution of UV Radiation Field in the Molecular Clouds of Gould Belt
Li, Di; Xie, Jinjin; Fuller, Gary A. +5 more
The distribution of ultraviolet (UV) radiation field provides critical constraints on the physical environments of molecular clouds. Within 1 kpc of our solar system and fostering protostars of different masses, the giant molecular clouds in the Gould Belt present an excellent opportunity to resolve the UV field structure in star-forming regions. …
The galaxy population of the core of the Coma cluster
Hasan, S. N.; Poloji, Nagamani; Hasan, Priya
In this paper, we present the structural properties and morphology of galaxies in the central region of the Coma Cluster brighter than 19.5 mag in the F814W band from the HST/ACS Coma Cluster Treasury Survey. Using mainly spectroscopic redshifts, we find 132 members from our sample of 219 galaxies. In our sample of 132 members, we find 51 non-dwar…
Evolution of pits at the surface of 67P/Churyumov-Gerasimenko
Guilbert-Lepoutre, Aurélie; Besse, Sébastien; Benseguane, Selma +6 more
Context. The observation of pits at the surface of comets offers the opportunity to take a glimpse into the properties and the mechanisms that shape a nucleus through cometary activity. If the origin of these pits is still a matter of debate, multiple studies have recently suggested that known phase transitions (such as volatile sublimation or amo…
Seismic modelling of the pulsating mercury-manganese star HD 29589
Niemczura, E.; Hubrig, S.; Hummel, C. A. +4 more
Photometric and spectroscopic time-series of chemically peculiar mercury-manganese (HgMn) stars show variability, which in most cases is interpreted as the effect of binarity or surface spots. Until recently, pulsations have not been detected in these objects. However, the analysis of the Transiting Exoplanet Survey Satellite (TESS) photometric ti…