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Cloud-cloud collision and star formation in G323.18+0.15
Li, Dalei; Tang, Xindi; Zhou, Jianjun +8 more
We studied the cloud-cloud collision candidate G323.18+0.15 based on signatures of induced filaments, clumps, and star formation. We used archival molecular spectrum line data from the SEDIGISM 13CO (J = 2−1) survey, from the Mopra southern Galactic plane CO survey, and infrared to radio data from the GLIMPSE, MIPS, Hi-GAL, and SGPS sur…
The colibri telescope array for KBO detection through serendipitous stellar occultations: A technical description
Metchev, Stanimir; Pass, Emily; Mazur, Michael J. +4 more
We present the technical design, construction and testing of the Colibri telescope array at Elginfield Observatory near London, Ontario, Canada. Three 50-cm telescopes are arranged in a triangular array and are separated by 110–160 m. During operation, they will monitor field stars at the intersections of the ecliptic and galactic plane for serend…
Pre-main sequence stars in LH 91
Panagia, N.; Beccari, G.; De Marchi, G. +3 more
Aims: We study the accretion properties of pre-main sequence (PMS) low-mass stars in the LH 91 association within the Large Magellanic Clouds.
Methods: Using optical multiband photometry obtained with the Hubble Space Telescope, we identify 75 candidates showing Hα excess emission above the 3σ level with equivalent width EWHα …
Optical Linear Polarization Study toward Czernik 3 Open Cluster at Different Spatial Scales
Bisht, D.; Ganesh, Shashikiran; Uppal, Namita
We present the optical linear polarization observation of stars toward the core of the Czernik 3 cluster in the Sloan i band. The data were obtained using the EMPOL instrument on the 1.2 m telescope at Mount Abu Observatory. We study the dust distribution toward this cluster by combining the results from our polarization observations with the data…
Long-term Evolution of Postexplosion Helium-star Companions of Type Iax Supernovae
Han, Zhanwen; McCully, Curtis; Heger, Alexander +3 more
Supernovae of Type Iax (SNe Iax) are an accepted faint subclass of hydrogen-free supernovae. Their origin, the nature of the progenitor systems, however, is an open question. Recent studies suggest that the weak deflagration explosion of a near-Chandrasekhar-mass white dwarf in a binary system with a helium-star donor could be the origin of SNe Ia…
Multispacecraft Remote Sensing and In Situ Observations of the 2020 November 29 Coronal Mass Ejection and Associated Shock: From Solar Source to Heliospheric Impacts
Liu, Ying D.; Zhu, Bei; Chen, Chong
We investigate the source eruption, propagation and expansion characteristics, and heliospheric impacts of the 2020 November 29 coronal mass ejection (CME) and associated shock, using remote sensing and in situ observations from multiple spacecraft. A potential-field source-surface model is employed to examine the coronal magnetic fields surroundi…
Statistical properties of cataclysmic variables in the local galactic disc: a joint analysis of Gaia and XMM-Newton data
Wang, Q. Daniel; Xu, Xiao-jie; Li, Xiangdong
Cataclysmic variables (CVs) represent a key evolutionary phase of many low-mass stellar binaries and appear to collectively dominate the galactic X-ray background above ~1 keV. Statistical properties of CVs, however, remain poorly understood, even in the solar neighbourhood. We aim to obtain an X-ray luminosity-complete sample of local CVs whose d…
The State of the White-Light Corona over the Minimum and Ascending Phases of Solar Cycle 25 - Comparison with Past Cycles
Lamy, Philippe; Gilardy, Hugo
We report on the state of the corona over the minimum and ascending phases of Solar Cycle (SC) 25 on the basis of the temporal evolutions of its radiance and of the properties of coronal mass ejections (CMEs), as determined from white-light observations performed by the SOHO/LASCO-C2 coronagraph. These evolutions are further compared with those de…
Magnetic Imprints of Eruptive and Noneruptive Solar Flares as Observed by Solar Dynamics Observatory
Ravindra, B.; Doddamani, V. H.; Vemareddy, P. +1 more
The abrupt and permanent changes of the photospheric magnetic field in the localized regions of active regions during solar flares, called magnetic imprints (MIs), have been observed for nearly the past three decades. The well-known coronal implosion model is assumed to explain such flare-associated changes but the complete physical understanding …
A Publicly Available Multiobservatory Data Set of an Enhanced Network Patch from the Photosphere to the Corona
Warren, Harry P.; Savage, Sabrina; Kobelski, Adam R. +3 more
New instruments sensitive to chromospheric radiation at X-ray, UV, visible, IR, and submillimeter wavelengths have become available that significantly enhance our ability to understand the bidirectional flow of energy through the chromosphere. We describe the calibration, coalignment, initial results, and public release of a new data set combining…