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The Herschel SPIRE Fourier Transform Spectrometer Spectral Feature Finder I. The Spectral Feature Finder and Catalogue
Valtchanov, I.; Spencer, L. D.; Hopwood, R. +11 more
We provide a detailed description of the Herschel/SPIRE Fourier Transform Spectrometer (FTS) Spectral Feature Finder (FF). The FF is an automated process designed to extract significant spectral features from SPIRE FTS data products. Optimizing the number of features found in SPIRE-FTS spectra is challenging. The wide SPIRE-FTS frequency range (44…
Differences in radio emission from similar M dwarfs in the binary system Ross 867-8
Callingham, J. R.; Shimwell, T. W.; Intema, H. T. +5 more
Serendipitously, we rediscovered radio emission from the binary system Ross 867 (M4.5V) and Ross 868 (M3.5V) while inspecting archival Giant Metrewave Radio Telescope (GMRT) observations. The binary system consists of two M-dwarf stars that share common characteristics such as spectral type, astrometric parameters, age, and emission at infrared, o…
Discovery of an 30-yr-duration post-nova pulsating supersoft source in the Large Magellanic Cloud
Haberl, F.; Udalski, A.; Vasilopoulos, G. +3 more
Supersoft X-ray sources (SSS) have been identified as white dwarfs accreting from binary companions and undergoing nuclear burning of the accreted material on their surface. Although expected to be a relatively numerous population from both binary evolution models and their identification as type Ia supernova progenitor candidates, given the very …
Location, orbit, and energy of a meteoroid impacting the Moon during the lunar eclipse of 2019 January 21
Zuluaga, J. I.; Tangmatitham, M.; Cuartas-Restrepo, P. +5 more
During lunar eclipse of 2019 January 21, a meteoroid impacted the Moon producing a visible light flash. The impact was witnessed by casual observers offering an opportunity to study the phenomenon from multiple geographical locations. We use images and videos collected by observers in seven countries to estimate the location, impact parameters (sp…
Excitation Sources of Oscillations in Solar Coronal Loops: A Multi-wavelength Analysis
Conde C., Sandra M.; Jain, Rekha; Jatenco-Pereira, Vera
An investigation into the excitation sources of oscillations detected in a coronal loop structure is carried out using the images obtained with Interface Region Imaging Spectrometer (IRIS) and the Atmospheric Imaging Assembly (AIA) instrument on board the Solar Dynamics Observatory (SDO). A loop structure in the active region AR 11967 on 2014 Janu…
Spatially Resolved Velocity Structures in Jets of DF Tau and UY Aur A
Principe, David A.; Günther, Hans Moritz; Schneider, P. Christian +1 more
Young stars accrete mass and angular momentum from their circumstellar disks. Some of them also drive outflows, which can be distinguished in optical forbidden emission lines. We analyze a sample of binary T Tauri stars observed with long-slit spectroscopy by the Hubble Space Telescope between 1998 and 2000, searching for spatially resolved outflo…
Swift unveils the orbital period of IGR J18214-1318
Cusumano, G.; La Parola, V.; Segreto, A. +2 more
We analysed 13 yr of the Neil Gehrels Swift Observatory survey data collected on the high-mass X-ray binary IGR J18214-1318. Performing the timing analysis, we detected a periodic signal of 5.42 d. From the companion star characteristics, we derived an average orbital separation of $\sim 41 \rm R_{\odot }\simeq 2 R_{\star }$ . The spectral type of…
Measuring the matter density of the Galactic disc using stellar streams
Malhan, Khyati; Widmark, Axel; Sivertsson, Sofia +1 more
We present a novel method for determining the total matter surface density of the Galactic disc by analysing the kinematics of a dynamically cold stellar stream that passes through or close to the Galactic plane. The method relies on the fact that the vertical component of energy for such stream stars is approximately constant, such that their ver…
Unveiling the Hierarchical Structure of Open Star Clusters: The Perseus Double Cluster
Diaferio, Antonaldo; Li, Lu; Shao, Zhengyi +1 more
We introduce a new kinematic method to investigate the structure of open star clusters. We adopt a hierarchical clustering algorithm that uses the celestial coordinates and the proper motions of the stars in the field of view of the cluster to estimate a proxy of the pairwise binding energy of the stars and arrange them in a binary tree. The clust…
Long photometric cycle and disk evolution in the β Lyrae-type binary OGLE-BLG-ECL-157529
Soszyński, I.; Poleski, R.; Iwanek, P. +4 more
Context. The subtype of hot algol semidetached binaries dubbed double periodic variables (DPVs) are characterized by a photometric cycle longer than the orbital one, whose nature has been related to a magnetic dynamo in the donor component controlling the mass transfer rate.
Aims: We aim to understand the morphologic changes observed in the l…