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Photometric and Spectroscopic Study of the EXor-like Eruptive Young Star Gaia19fct
Pál, András; Lee, Jeong-Eun; Ábrahám, Péter +19 more
Gaia19fct is one of the Gaia-alerted eruptive young stars that has undergone several brightening events. We conducted monitoring observations using multifilter optical and near-infrared photometry, as well as near-infrared spectroscopy, to understand the physical properties of Gaia19fct and investigate whether it fits into the historically defined…
The family pictures of our neighbours: investigating the mass function and dynamical parameters of nearby open clusters
Sollima, A.; Haghi, H.; Ebrahimi, H.
We determine the mass functions (MFs) and the dynamical parameters of 15 nearby open clusters (OCs), using the unprecedented data set of the Gaia Early Data Release 3. We select the members of each cluster by combining the photometric (colour and magnitude) and astrometric (parallax and proper motions) parameters of stars, minimizing the contamina…
A Light-curve Analysis of the X-Ray Flash First Observed in Classical Novae
Kato, Mariko; Hachisu, Izumi; Saio, Hideyuki
An X-ray flash, expected in a very early phase of a nova outburst, was at last detected with the SRG/eROSITA in the classical nova YZ Reticuli 2020. The observed flash timescale, luminosity, and blackbody temperature substantially constrain the nova model. We present light-curve models of the X-ray flash for various white dwarf (WD) masses and mas…
Probability of Forming Gaps in the GD-1 Stream by Close Encounters of Globular Clusters
Hattori, Kohei; Doke, Yuka
One of the most intriguing properties of the GD-1 stellar stream is the existence of three gaps. If these gaps were formed by close encounters with dark matter subhalos, the GD-1 stream opens an exciting window through which we can see the size, mass, and velocity distributions of the dark matter subhalos in the Milky Way. However, in order to use…
V456 Cyg: An eclipsing binary with tidally perturbed g-mode pulsations
Southworth, J.; Bowman, D. M.; Van Reeth, T. +1 more
Context. Many well-known bright stars have been observed by the ongoing transiting exoplanet survey satellite (TESS) space mission. For several of them, these new data reveal previously unobserved variability, such as tidally perturbed pulsations in close binary stars.
Aims: Using newly detected gravity-mode (g-mode) pulsations in V456 Cyg, w…
HAZMAT. VIII. A Spectroscopic Analysis of the Ultraviolet Evolution of K Stars: Additional Evidence for K Dwarf Rotational Stalling in the First Gigayear
Loyd, R. O. Parke; Jackman, James A. G.; Barman, Travis +7 more
Efforts to discover and characterize habitable zone planets have primarily focused on Sun-like stars and M dwarfs. K stars, however, provide an appealing compromise between these two alternatives that has been relatively unexplored. Understanding the ultraviolet (UV) environment around such stars is critical to our understanding of their planets, …
DUVET: Spatially Resolved Observations of Star Formation Regulation via Galactic Outflows in a Starbursting Disk Galaxy
Fielding, Drummond; Cameron, Alex J.; Kacprzak, Glenn G. +14 more
We compare 500 pc scale, resolved observations of ionized and molecular gas for the z ~ 0.02 starbursting disk galaxy IRAS08339+6517, using measurements from KCWI and NOEMA. We explore the relationship of the star-formation-driven ionized gas outflows with colocated galaxy properties. We find a roughly linear relationship between the outflow mass …
On the Formation of Solar Wind and Switchbacks, and Quiet Sun Heating
Tripathi, Durgesh; Upendran, Vishal
The solar coronal heating in quiet Sun (QS) and coronal holes (CHs), including solar wind formation, are intimately tied by magnetic field dynamics. Thus, a detailed comparative study of these regions is needed to understand the underlying physical processes. CHs are known to have subdued intensity and larger blueshifts in the corona. This work in…
Project Hephaistos - I. Upper limits on partial Dyson spheres in the Milky Way
Wright, Jason T.; Zackrisson, Erik; Korn, Andreas J. +2 more
Dyson spheres are hypothetical megastructures built by advanced extraterrestrial civilizations to harvest radiation energy from stars. Here, we combine optical data from Gaia DR2 with mid-infrared data from AllWISE to set the strongest upper limits to date on the prevalence of partial Dyson spheres within the Milky Way, based on their expected was…
Revisiting a Disky Origin for the Faint Branch of the Sagittarius Stellar Stream
Errani, Raphaël; Famaey, Benoit; Ibata, Rodrigo +2 more
We investigate ways to produce the bifurcation observed in the stellar stream of the Sagittarius dwarf galaxy (Sgr). Our method consists of running N-body simulations of Sgr falling into the Milky Way for the last 3 Gyr, with added test particles on disk orbits that span a wide range of initial positions, energies, and angular momenta. We find tha…