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UV core dimming in coronal streamer belt and the projection effects
Abbo, L.; Giordano, S.; Ofman, L.
During solar minimum activity, the coronal structure is dominated by a tilted streamer belt, associated with the sources of the slow solar wind. It is known that some UV coronal spectral observations show a quite evident core dimming in heavy ions emission in quiescent streamers. In this paper, our purpose is to investigate this phenomenon by comp…
Open cluster kinematics with Gaia DR2 (Corrigendum)
Castro-Ginard, A.; Jordi, C.; Casamiquela, L. +16 more
The table with clusters velocities is only available at the CDS via anonymous ftp to http://cdsarc.u-strasbg.fr (http://130.79.128.5) or via http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/623/C2
Differential astrometric framework for the Jupiter relativistic experiment with Gaia
Abbas, Ummi; Bucciarelli, Beatrice; Lattanzi, Mario G.
We employ differential astrometric methods to establish a small field reference frame stable at the microarcsecond (µas) level on short time-scales using high-cadence simulated observations taken by Gaia in 2017 February of a bright star close to the limb of Jupiter, as part of the relativistic experiment on Jupiter's quadrupole. We achieve …
Solar Neighborhood Kinematics from Gaia -LAMOST Dwarf Stars
Zhu, Z.; Liu, J. -C.; Ding, P. -J.
We use high-precision kinematic data from Gaia data release 2 (DR2) and spectroscopic data from Large Sky Area Multi-Object Fibre Spectroscopic Telescope (LAMOST) data release 5 (DR5) to explore the kinematics of solar neighborhood dwarf stars in the northern and southern sides of the Galactic plane. The metallicity range of the sampled stars is -…
Absolute Dimensions of the Early F-type Eclipsing Binary V506 Ophiuchi
Torres, Guillermo; Fekel, Francis C.; Muterspaugh, Matthew W. +1 more
We report extensive differential V-band photometry and high-resolution spectroscopic observations of the early F-type, 1.06-day detached eclipsing binary V506 Oph. The observations, along with times of minimum light from the literature, are used to derive a very precise ephemeris and the physical properties for the components, with the absolute ma…
New Double Periodic Variable stars in the ASAS-SN Catalog
Mennickent, R. E.; Rosales, J. A.
We report the discovery of 3 new Double Periodic Variables based on the analysis of ASAS-SN light curves: GSD J11630570-510306, V593 Sco and TYC 6939-678-1. These systems have orbital periods between 10 and 20 days and long cycles between 300 and 600 days.
Ultraviolet photo-ionisation in far-infrared selected sources
Curran, S. J.; Duchesne, S. W.
It has been reported that there is a deficit of stellar heated dust, as evident from the lack of far-infrared (FIR) emission, in sources within the Herschel-SPIRE sample with X-ray luminosities exceeding a critical value of LX ∼ 1037 W. Such a scenario would be consistent with the suppression of star formation by the AGN, req…
Discovery of Two Quasars at z = 5 from the OGLE Survey
Greiner, J.; Soszyński, I.; Udalski, A. +17 more
We used Optical Gravitational Lensing Experiment (OGLE-IV) deep (stacked) images (V ≲ 23 mag, I ≲ 23 mag at 3σ) of the Magellanic System, encompassing an area of ∼670 deg2, to perform a search for high-z quasar candidates. We combined the optical OGLE data with the mid-IR Wide-field Infrared Survey Explorer 3.4/4.6/12 µm data, and…
Adaptive Grid Lens Modeling of the Cosmic Horseshoe Using Hubble Space Telescope Imaging
Cui, Wei; Li, Guoliang; Wiesner, Matthew P. +3 more
The Cosmic Horseshoe gravitational lensing system is an extraordinary example of strong gravitational lensing both due to the nearly complete Einstein ring formed in this system and due to the star-forming nature of the lensed z = 2.38 Lyman-break galaxy. In this paper, we describe the development of a new lens modeling package and the lens models…
Unification of strongly magnetized neutron stars with regard to X‑ray emission from hot spots
Hayashida, K.; Nakajima, H.; Matsumoto, H. +1 more
Strongly magnetized isolated neutron stars (NSs) are categorized into two families according, mainly, to their magnetic field strength. The one with a higher magnetic field of 1014–1015 Gauss is called "magnetar," and the other is the X‑ray isolated neutron star (XINS) with 1013 Gauss. Both magnetars and XINSs show thermal emission in X‑rays, whos…