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A Geoeffective CME Caused by the Eruption of a Quiescent Prominence on 29 September 2013
Grechnev, V. V.; Kuzmenko, I. V.
The eruption of a large prominence that occurred away of active regions in the SOL2013-09-29 event produced a fast coronal mass ejection (CME) and a shock wave. The event caused considerable geospace disturbances, including a proton enhancement that have been addressed in previous studies. Continuing with the analysis of this event, we focus on th…
A broadband X-ray view of the NLSy1 1E 0754.6+3928
Bianchi, S.; Petrucci, P. -O.; Miniutti, G. +8 more
Context. The soft X-ray band of many active galactic nuclei (AGNs) is affected by obscuration due to partially ionised matter crossing our line of sight. In this context, two past XMM-Newton observations that were six months apart and a simultaneous NuSTAR-Swift exposure of the Narrow Line Seyfert 1 galaxy 1E 0754.6+3928, which was approximately e…
Determination of the Configurations of Boundaries in Space
Russell, C. T.; Dunlop, M.; Rong, Zhaojin +5 more
This research aims to determine the geometrical configurations of boundary surfaces in the space environment, based on multiple spacecraft measurements. To achieve this, the Normal Field Analysis (NFA) method is presented here. With multipoint observations, the three-dimensional gradient of the normal of boundary layers can be obtained, and the pr…
Gaia DR2 data and the evolutionary status of eight high-velocity hot post-AGB candidates
Matsuno, Tadafumi; Aoki, Wako; Parthasarathy, Mudumba
From Gaia DR2 data of eight high-velocity hot post-AGB candidates, LS 3593, LSE 148, LS 5107, HD 172324, HD 214539, LS IV -12 111, LS III +52 24, and LS 3099, we found that six of them have accurate parallaxes which made it possible to derive their distances, absolute visual magnitudes (MV) and luminosity (log L/L⊙). All the …
Properties of F Stars with Stable Radial Velocity Timeseries: A Useful Metric for Selecting Low-jitter F Stars
Wright, Jason T.; Isaacson, Howard; Luhn, Jacob K.
In a companion paper, we have conducted an in-depth analysis of radial velocity jitter of over 600 stars, examining the astrophysical origins including stellar granulation, oscillation, and magnetic activity. In this paper, we highlight a subsample of those stars, specifically the main sequence and "retired" F stars -- which we refer to as "MSRF" …
A HaloSat Analysis of the Cygnus Superbubble
Kaaret, Philip; Kuntz, K. D.; Bluem, Jesse +5 more
The Cygnus Superbubble (CSB) is a region of soft X-ray emission approximately 13 degrees wide in the direction of the local spiral arm. Such a large region might be the result of strong stellar winds and supernovae from nearby stellar nurseries, or it could be the result of a single event—a hypernova. HaloSat observed four nonoverlapping 10 degree…
A Mystery in Chamaeleon: Serendipitous Discovery of a Galactic Symbiotic Nova
Ting, Yuan-Sen; Greene, Jenny E.; Pope, Benjamin J. S. +3 more
We present the serendipitous discovery of a low optical-luminosity nova occurring in a D-type symbiotic binary star system in the Milky Way. We lay out the extensive archival data alongside new follow-up observations related to the stellar object CN Cha in the constellation of Chamaeleon. The object had long period (250 days), high amplitude (3 ma…
Dust emission, extinction, and scattering in LDN 1642
Ysard, Nathalie; Juvela, Mika; Neha, Sharma +3 more
Context. LDN 1642 is a rare example of a star-forming, high-latitude molecular cloud. The dust emission of LDN 1642 has already been studied extensively in the past, but its location also makes it a good target for studies of light scattering.
Aims: We wish to study the near-infrared (NIR) light scattering in LDN 1642, its correlation with th…
On the Effects of UV Photons/X-Rays on the Chemistry of the Sgr B2 Cloud
Martín-Pintado, J.; Requena-Torres, M. A.; Llerena, M. +7 more
The lines of HOC+, HCO, and CO+ are considered good tracers of photon-dominated regions (PDRs) and X-ray-dominated regions. We study these tracers toward regions of the Sgr B2 cloud selected to be affected by different heating mechanisms. We find the lowest values of the column density ratios of HCO+ versus HOC
A Galactic dust devil: far-infrared observations of the Tornado supernova remnant candidate
De Looze, I.; Rho, J.; Dunne, L. +10 more
We present complicated dust structures within multiple regions of the candidate supernova remnant (SNR) the 'Tornado' (G357.7-0.1) using observations with Spitzer and Herschel. We use point process mapping, PPMAP, to investigate the distribution of dust in the Tornado at a resolution of 8 arcsec, compared to the native telescope beams of 5-36 arcs…