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Optical characterization and radial velocity monitoring with Belgian and Indian telescopes (ORBIT): the eclipsing binaries EPIC 211982753 and EPIC 211915147
Goswami, Aruna; Joshi, Y. C.; De Cat, Peter +3 more
The K2 eclipsing binary (EB) candidates EPIC 211982753 (hereinafter called EPIC2753) and EPIC 211915147 (hereinafter called EPIC5147) are characterized with the help of photometric and high-resolution spectroscopic data. The light curve analysis uses the Rc-band photometric data from the 1.3-m Devasthal Fast Optical Telescope (DFOT, Ind…
Spatially resolved spectroscopic investigation of the born-again planetary nebula A 78
Guerrero, M. A.; Toalá, J. A.; Montoro-Molina, B.
We present the analysis of spatially resolved spectroscopic observations of the born-again planetary nebula (PN) A 78 that are used to investigate the chemistry and physical properties of its three main morphological components, namely the inner knots, its eye-like structure, and the low surface-brightness outer nebula. The H-poor chemical abundan…
MIGHTEE-H I: possible interactions with the galaxy NGC 895
Marchetti, L.; Vaccari, M.; Heywood, I. +29 more
The transformation and evolution of a galaxy is strongly influenced by interactions with its environment. Neutral hydrogen (H I) is an excellent way to trace these interactions. Here, we present H I observations of the spiral galaxy NGC 895, which was previously thought to be isolated. High-sensitivity H I observations from the MeerKAT large surve…
V4142 Sgr: Double periodic variable with an accretor surrounded by the accretion disk's atmosphere
Mennickent, R. E.; Djurašević, G.; Petrović, J. +4 more
Context. A detailed study of the close interacting binary V4142 Sgr, based on photometric and spectroscopic analyses, indicates that this system belongs to the enigmatic class of Algol-like variables exhibiting a long photometric cycle of an unknown nature.
Aims: By performing photometric data-mining and spectroscopic observations covering th…
Common envelope evolution and triple dynamics as potential pathways to form the inner white dwarf + brown dwarf binary of the triple star system Gaia 0007-1605
Gänsicke, B. T.; Schreiber, Matthias R.; Lagos, Felipe +1 more
The recently discovered system Gaia 0007-1605 consisting of a white dwarf (WD) with a close brown dwarf companion and a distant WD tertiary very much resembles the triple system containing the first transiting planet candidate around a WD ever discovered: WD 1856+534. We have previously argued that the inner binary in WD 1856+534 most likely forme…
Trajectories of coronal mass ejection from solar-type stars
Kay, Christina; Valio, Adriana; Araújo, Alexandre +3 more
The Sun and other solar-type stars have magnetic fields that permeate their interior and surface, extend through the interplanetary medium, and are the main drivers of stellar activity. Stellar magnetic activity affects the physical processes and conditions of the interplanetary medium and orbiting planets. Coronal mass ejections (CMEs) are the mo…
Statistical comparison of time profiles of Forbush decreases associated with coronal mass ejections and streams from coronal holes in solar cycles 23-24
Melkumyan, A. A.; Belov, A. V.; Abunina, M. A. +4 more
In this paper, Forbush decrease (FD) profiles are compared for events associated with (i) coronal mass ejections from active regions accompanied by solar flares (AR CMEs), (ii) filament eruptions away from active regions (non-AR CMEs), and (iii) high-speed streams (HSSs) from coronal holes (CHs). FD profiles are described by time parameters that a…
Clustering Properties of Intermediate and High-mass Young Stellar Objects
Ribas, Álvaro; Kuhn, Michael A.; Oudmaijer, René D. +6 more
We have selected 337 intermediate- and high-mass young stellar objects (YSOs; 1.5-20 M ⊙) well-characterized with spectroscopy. By means of the clustering algorithm HDBSCAN, we study their clustering and association properties in the Gaia DR3 catalog as a function of stellar mass. We find that the lower-mass YSOs (1.5-4 M ⊙) …
Coronal line forest AGN - II. Analysis of the spectral energy distribution
Riffel, R.; Rodríguez-Ardila, A.; Panda, S. +3 more
Coronal-Line Forest Active Galactic Nuclei (CLiF AGN) are characterized by strong, high-ionization lines, which are in contrast to what is found in typical AGNs. Here, we carry out an infrared analysis aimed at understanding the spectral energy distribution (SED) of six sources from this group. In this work, the properties of the dusty torus for t…
Probing the global dust properties and cluster formation potential of the giant molecular cloud G148.24+00.41
Chen, W. P.; Marton, G.; Zavagno, A. +8 more
Clouds more massive than about 105 M⊙ are potential sites of massive cluster formation. Studying the properties of such clouds in the early stages of their evolution offers an opportunity to test various cluster formation processes. We make use of CO, Herschel, and UKIDSS observations to study one such cloud, G148.24+00.41. O…