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General relativistic impact on the precision of BepiColombo gravity-assists
Yefremov, Alexander P.
The general relativistic (GR) impact is assessed on the precision of the announced BepiColombo (BC) space positions at the Earth, Venus and Mercury flyby points providing planned gravity-assists. Apart of the known elliptic orbit precession, another recently specified for the Schwarzschild-Kerr metric effect of the ellipse axes contraction is cons…
The KMOS Lens-Amplified Spectroscopic Survey (KLASS): kinematics and clumpiness of low-mass galaxies at cosmic noon
Schaerer, D.; Vulcani, B.; Treu, T. +9 more
We present results from the KMOS Lens-Amplified Spectroscopic Survey (KLASS), an ESO Very Large Telescope (VLT) large program using gravitational lensing to study the spatially resolved kinematics of 44 star-forming galaxies at 0.6 < z < 2.3 with a stellar mass of 8.1 < log(M⋆/M⊙) < 11.0. These galaxies are locate…
Serial Flaring in an Active Region: Exploring Why Only One Flare Is Eruptive
Harra, Louise K.; Matthews, Sarah A.; Kusano, Kanya +2 more
Over a four hour period between 2014 June 12-13 a series of three flares were observed within AR 12087. This sequence of flares started with a non-eruptive M-class flare, followed by a non-eruptive C-class flare, and finally ended with a second C-class flare that had an associated filament eruption. In this paper we combine spectroscopic analysis …
High-z Universe Probed via Lensing by QSOs (HULQ). I. Number Estimates of QSO-QSO and QSO-Galaxy Lenses
Im, Myungshin; Taak, Yoon Chan
It is unclear how galaxies and their central supermassive black holes coevolve across cosmic time, especially for the nonlocal universe (z ≳ 0.5). The High-z Universe probed via Lensing by QSOs project proposes to utilize quasi-stellar object (QSO) host galaxies acting as gravitational lenses (QSO lenses) to investigate this topic. This paper focu…
X-ray study of high-and-low luminosity modes and peculiar low-soft-and-hard activity in the transitional pulsar XSS J12270-4859
D'Avanzo, P.; Campana, S.; Miraval Zanon, A. +2 more
XSS J12270-4859 (henceforth J12270) is the first low-mass X-ray binary to exhibit a transition, taking place at the end of 2012, from an X-ray active state to a radio pulsar state. The X-ray emission based on archival XMM-Newton observations is highly variable, showing rapid variations (∼10 s) from a high X-ray luminosity mode to a low mode and ba…
Small-scale star formation as revealed by VVVX galactic cluster candidates
Minniti, D.; Chené, A. -N.; Alonso-García, J. +8 more
We report a search and analysis of obscured cluster candidates in the 'VISTA Variables in the Via Lactea eXtended (VVVX)' ESO Public Survey area encompassing the region between 229 ${_{.}^{\circ}}$ 4 < l < 295 ${_{.}^{\circ}}$ 2 and -4 ${_{.}^{\circ}}$ 3 < b < 4 ${_{.}^{\circ}}$ 4 of the southern Galactic disc. We discover and propose …
Astrometry and infrared observations of the Mira variable stars AP Lyncis, V837 Herculis, and BX Camelopardalis: Implications for the period-luminosity relation of the Milky Way
Fujimoto, Masayuki Y.; Nakagawa, Akiharu; Nagayama, Takahiro +6 more
AP Lyn and V837 Her are long-period Mira variable stars in the Milky Way. We performed VLBI Exploration of Radio Astrometry (VERA) phase-referenced observations towards H2O masers associated with AP Lyn and V837 Her. The annual parallaxes of AP Lyn and V837 Her were obtained to be 2.008 ± 0.038 mas and 1.090 ± 0.014 mas, corresponding t…
A Spectroscopic Classification Survey to Search for New ρ Puppis Stars
Gray, Richard O.; McGahee, Courtney; Griffin, R. E. M. +2 more
The ρ Puppis stars are mid-F-type stars that show peculiar chemical-abundance patterns similar to those of the Am stars. Typically they exhibit overabundances of iron-peak elements such as Fe and Ni and s- and r-process elements such as Sr and Eu, and underabundances of certain other elements including He, Ca, and Sc. It has been proposed that the…
A catalogue of open cluster radii determined from Gaia proper motions
Alfaro, Emilio J.; Sánchez, Néstor; López-Martínez, Fátima
In this work, we improve a previously published method to calculate in a reliable way the radius of an open cluster (OC). The method is based on the behaviour of stars in the proper motion space as the sampling changes in the position space. Here, we describe the new version of the method and show its performance and robustness. Additionally, we a…
Following the TraCS of exoplanets with Pan-Planets: Wendelstein-1b and Wendelstein-2b
Saglia, R. P.; Henning, Th.; Bender, R. +13 more
Hot Jupiters seem to get rarer with decreasing stellar mass. The goal of the Pan-Planets transit survey was the detection of such planets and a statistical characterization of their frequency. Here, we announce the discovery and validation of two planets found in that survey, Wendelstein-1b and Wendelstein-2b, which are two short-period hot Jupite…