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Absence of a correlation between white dwarf planetary accretion and primordial stellar metallicity
Vanderburg, Andrew; Bieryla, Allyson; Latham, David W. +8 more
Over a quarter of white dwarfs have photospheric metal pollution, which is evidence for recent accretion of exoplanetary material. While a wide range of mechanisms have been proposed to account for this pollution, there are currently few observational constraints to differentiate between them. To investigate the driving mechanism, we observe a sam…
The improved component masses and parallaxes for the two close binary stars: HD80671 and HD97038
Masda, Suhail
We present the fundamental stellar parameters, including the individual component masses, as well as the orbital parameters, and dynamical parallaxes of the two close binary stars; HD80671, and HD97038. The stellar parameters are spectrophotometrically estimated via Al-Wardat's method for analyzing binary and multiple stellar systems, which is hav…
Molecular line polarisation from the circumstellar envelopes of asymptotic giant branch stars
Velilla-Prieto, L.; Vlemmings, W. H. T.; Lankhaar, B.
Context. Polarisation observations of masers in the circumstellar envelopes (CSEs) around asymptotic giant branch (AGB) stars have revealed strong magnetic fields. However, masers probe only specific lines of sight through the CSE. Non-masing molecular line polarisation observations can more directly reveal the large-scale magnetic field morpholog…
An all-sky catalogue of stellar reddening values
Paunzen, E.; Prišegen, M.; Faltová, N. +1 more
Context. When observing astronomical objects, we have to deal with extinction (i.e. the absorption and scattering of the emitted radiation by dust and gas between the source and the observer). Interstellar extinction depends on the location of the object and the wavelength. The different extinction laws describing these effects are difficult to es…
Discovery of a hyperluminous quasar at z = 1.62 with Eddington ratio >3 in the eFEDS field confirmed by KOOLS-IFU on Seimei Telescope
Imanishi, Masatoshi; Ueda, Yoshihiro; Toba, Yoshiki +17 more
We report the discovery of a hyperluminous type 1 quasar (eFEDS J082826.9-013911; eFEDS J0828-0139) at
CLASH-VLT: Galaxy cluster MACS J0329–0211 and its surroundings using galaxies as kinematic tracers
Demarco, R.; Grillo, C.; Tozzi, P. +9 more
Context. The study of substructure is an important step in determining how galaxy clusters form. Aims. We aim to gain new insights into the controversial dynamical status of MACS J0329–0211 (MACS0329), a massive cluster at z = 0.4503 ± 0.0003, through a new analysis using a large sample of member galaxies as kinematic tracers. Methods. Our analysi…
Effects of Background Solar Wind and Drag Force on the Propagation of Coronal-mass-ejection-driven Shocks
Wood, Brian E.; Wu, Chin-Chun; Liou, Kan +1 more
The propagation of interplanetary shocks, particularly those driven by coronal mass ejections (CMEs), is still an outstanding question in heliophysics and space weather forecasting. Here, we address the effects of the ambient solar wind on the propagation of two similar CME-driven shocks from the Sun to Earth. The two shock events (CME03, 2010 Apr…
Discovery of 118 New Ultracool Dwarf Candidates Using Machine-learning Techniques
Tang, Shih-Yun; Meisner, Aaron M.; Kirkpatrick, J. Davy +45 more
We present the discovery of 118 new ultracool dwarf candidates, discovered using a new machine-learning tool, named SMDET, applied to time-series images from the Wide-field Infrared Survey Explorer. We gathered photometric and astrometric data to estimate each candidate's spectral type, distance, and tangential velocity. This sample has a photomet…
Exploring the relationship between X-ray binaries and compact star clusters (I): NGC 4490 and NGC 4214
Akyuz, A.; Aksaker, N.; Allak, S. +3 more
We conducted a study to investigate the relationship between X-ray binaries (XRBs) and compact star clusters in the nearby star-forming galaxies NGC 4490 and NGC 4214. By analysing archival data from Chandra, we identified a total of 32 XRBs with X-ray luminosities Lx > 1036 erg s-1 in both galaxies. Utilizing d…
An Unidentified Fermi Source Emitting Radio Bursts in the Galactic Bulge
Schinzel, F. K.; Bower, Geoffrey C.; Demorest, Paul B. +5 more
We report on the detection of radio bursts from the Galactic bulge using the real-time transient detection and localization system, realfast. The pulses were detected commensally on the Karl G. Jansky Very Large Array during a survey of unidentified Fermi γ-ray sources. The bursts were localized to subarcsecond precision using realfast fast-sample…